{"id":3862,"date":"2026-03-06T12:32:11","date_gmt":"2026-03-06T11:32:11","guid":{"rendered":"https:\/\/elementer.cz\/?page_id=3862"},"modified":"2026-04-23T08:57:42","modified_gmt":"2026-04-23T06:57:42","slug":"chytra-online-kalkulacka","status":"publish","type":"page","link":"https:\/\/elementer.cz\/en\/nastroje\/chytra-online-kalkulacka\/","title":{"rendered":"Chytr\u00e1 online kalkula\u010dka"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"3862\" class=\"elementor elementor-3862\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7ab6fff e-con-full e-flex e-con e-parent\" data-id=\"7ab6fff\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;shape_divider_bottom&quot;:&quot;wave-brush&quot;}\">\n\t\t\t\t<div class=\"elementor-shape elementor-shape-bottom\" aria-hidden=\"true\" data-negative=\"false\">\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" 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data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-1154c76 e-con-full e-flex e-con e-child\" data-id=\"1154c76\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9aef872 elementor-widget elementor-widget-heading\" data-id=\"9aef872\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Chytr\u00e1 kalkula\u010dka<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-828d4ff elementor-widget elementor-widget-heading\" data-id=\"828d4ff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Po\u010d\u00edtejte s histori\u00ed, procenty, slevami i p\u0159epo\u010dtem pom\u011bru<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4df6eb8 e-con-full e-flex e-con e-child\" data-id=\"4df6eb8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-70ef976 elementor-align-left elementor-widget elementor-widget-button\" data-id=\"70ef976\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/elementer.cz\/nastroje\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">V\u0161echny n\u00e1stroje<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2170159 e-flex e-con-boxed e-con e-parent\" data-id=\"2170159\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-05e43a1 e-con-full e-flex e-con e-child\" data-id=\"05e43a1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-8e75221 e-con-full e-flex e-con e-child\" data-id=\"8e75221\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e6fd6c9 elementor-widget elementor-widget-html\" data-id=\"e6fd6c9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"smart-calculator-layout\">\r\n  <div class=\"smart-calculator-box\">\r\n    <div class=\"calculator-display-wrap\">\r\n      <div id=\"calculatorExpression\" class=\"calculator-expression\">0<\/div>\r\n      <div id=\"calculatorResult\" class=\"calculator-result\">0<\/div>\r\n    <\/div>\r\n\r\n    <div class=\"calculator-actions-top\">\r\n      <button type=\"button\" onclick=\"clearCalculator()\">C<\/button>\r\n      <button type=\"button\" onclick=\"deleteLastCharacter()\">\u232b<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression('(')\">(<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression(')')\">)<\/button>\r\n    <\/div>\r\n\r\n    <div class=\"calculator-grid\">\r\n      <button type=\"button\" onclick=\"appendToExpression('7')\">7<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression('8')\">8<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression('9')\">9<\/button>\r\n      <button type=\"button\" onclick=\"appendOperator('\/')\">\u00f7<\/button>\r\n\r\n      <button type=\"button\" onclick=\"appendToExpression('4')\">4<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression('5')\">5<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression('6')\">6<\/button>\r\n      <button type=\"button\" onclick=\"appendOperator('*')\">\u00d7<\/button>\r\n\r\n      <button type=\"button\" onclick=\"appendToExpression('1')\">1<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression('2')\">2<\/button>\r\n      <button type=\"button\" onclick=\"appendToExpression('3')\">3<\/button>\r\n      <button type=\"button\" onclick=\"appendOperator('-')\">-<\/button>\r\n\r\n      <button type=\"button\" onclick=\"appendToExpression('0')\">0<\/button>\r\n      <button type=\"button\" onclick=\"appendDecimal()\">,<\/button>\r\n      <button type=\"button\" onclick=\"appendOperator('+')\">+<\/button>\r\n      <button type=\"button\" class=\"calculator-equals\" onclick=\"calculateExpression()\">=<\/button>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"calculator-tools-grid\">\r\n    <div class=\"side-tool-box\">\r\n      <h4>Nav\u00fd\u0161en\u00ed \u010d\u00e1stky o procenta<\/h4>\r\n      <p class=\"side-tool-help\">Zadejte p\u016fvodn\u00ed \u010d\u00e1stku a procento nav\u00fd\u0161en\u00ed. N\u00e1stroj spo\u010d\u00edt\u00e1 novou v\u00fdslednou \u010d\u00e1stku.<\/p>\r\n\r\n      <label for=\"increaseBase\"><b>P\u016fvodn\u00ed \u010d\u00e1stka (K\u010d):<\/b><\/label>\r\n      <input type=\"text\" id=\"increaseBase\" value=\"1 000\" oninput=\"formatToolInput(this); updateIncreaseTool()\">\r\n\r\n      <label for=\"increasePercent\"><b>Nav\u00fd\u0161en\u00ed (%):<\/b><\/label>\r\n      <input type=\"number\" id=\"increasePercent\" value=\"21\" step=\"0.01\" oninput=\"updateIncreaseTool()\">\r\n\r\n      <div class=\"side-tool-result\">V\u00fdsledn\u00e1 \u010d\u00e1stka: <span id=\"increaseResult\">0<\/span> K\u010d<\/div>\r\n\r\n      <div class=\"side-tool-actions\">\r\n        <button type=\"button\" onclick=\"useToolResult('increase')\">Pou\u017e\u00edt<\/button>\r\n        <button type=\"button\" onclick=\"saveToolResult('Nav\u00fd\u0161en\u00ed o %', 'increase')\">Do historie<\/button>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"side-tool-box\">\r\n      <h4>Sn\u00ed\u017een\u00ed \u010d\u00e1stky o procenta<\/h4>\r\n      <p class=\"side-tool-help\">Zadejte p\u016fvodn\u00ed \u010d\u00e1stku a procento sn\u00ed\u017een\u00ed. Hod\u00ed se nap\u0159\u00edklad pro slevy nebo zlevn\u011bn\u00ed.<\/p>\r\n\r\n      <label for=\"decreaseBase\"><b>P\u016fvodn\u00ed \u010d\u00e1stka (K\u010d):<\/b><\/label>\r\n      <input type=\"text\" id=\"decreaseBase\" value=\"1 000\" oninput=\"formatToolInput(this); updateDecreaseTool()\">\r\n\r\n      <label for=\"decreasePercent\"><b>Sn\u00ed\u017een\u00ed (%):<\/b><\/label>\r\n      <input type=\"number\" id=\"decreasePercent\" value=\"15\" step=\"0.01\" oninput=\"updateDecreaseTool()\">\r\n\r\n      <div class=\"side-tool-result\">V\u00fdsledn\u00e1 \u010d\u00e1stka: <span id=\"decreaseResult\">0<\/span> K\u010d<\/div>\r\n\r\n      <div class=\"side-tool-actions\">\r\n        <button type=\"button\" onclick=\"useToolResult('decrease')\">Pou\u017e\u00edt<\/button>\r\n        <button type=\"button\" onclick=\"saveToolResult('Sn\u00ed\u017een\u00ed o %', 'decrease')\">Do historie<\/button>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"side-tool-box\">\r\n      <h4>Kolik je X % z \u010d\u00e1stky<\/h4>\r\n      <p class=\"side-tool-help\">Zadejte \u010d\u00e1stku a procento. N\u00e1stroj spo\u010d\u00edt\u00e1, kolik je dan\u00e9 procento z t\u00e9to \u010d\u00e1stky.<\/p>\r\n\r\n      <label for=\"percentOfBase\"><b>\u010c\u00e1stka (K\u010d):<\/b><\/label>\r\n      <input type=\"text\" id=\"percentOfBase\" value=\"1 000\" oninput=\"formatToolInput(this); updatePercentOfTool()\">\r\n\r\n      <label for=\"percentOfPercent\"><b>Procento (%):<\/b><\/label>\r\n      <input type=\"number\" id=\"percentOfPercent\" value=\"21\" step=\"0.01\" oninput=\"updatePercentOfTool()\">\r\n\r\n      <div class=\"side-tool-result\">V\u00fdsledek: <span id=\"percentOfResult\">0<\/span> K\u010d<\/div>\r\n\r\n      <div class=\"side-tool-actions\">\r\n        <button type=\"button\" onclick=\"useToolResult('percentOf')\">Pou\u017e\u00edt<\/button>\r\n        <button type=\"button\" onclick=\"saveToolResult('Kolik je X % z \u010d\u00e1stky', 'percentOf')\">Do historie<\/button>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"side-tool-box\">\r\n      <h4>Procentn\u00ed zm\u011bna mezi dv\u011bma hodnotami<\/h4>\r\n      <p class=\"side-tool-help\">Zadejte p\u016fvodn\u00ed a novou hodnotu. N\u00e1stroj spo\u010d\u00edt\u00e1, o kolik procent se hodnota zm\u011bnila.<\/p>\r\n\r\n      <label for=\"changeOriginal\"><b>P\u016fvodn\u00ed hodnota:<\/b><\/label>\r\n      <input type=\"text\" id=\"changeOriginal\" value=\"1 000\" oninput=\"formatToolInput(this); updateChangeTool()\">\r\n\r\n      <label for=\"changeNew\"><b>Nov\u00e1 hodnota:<\/b><\/label>\r\n      <input type=\"text\" id=\"changeNew\" value=\"1 250\" oninput=\"formatToolInput(this); updateChangeTool()\">\r\n\r\n      <div class=\"side-tool-result\">Procentn\u00ed zm\u011bna: <span id=\"changeResult\">0<\/span> %<\/div>\r\n\r\n      <div class=\"side-tool-actions\">\r\n        <button type=\"button\" onclick=\"useToolResult('change')\">Pou\u017e\u00edt<\/button>\r\n        <button type=\"button\" onclick=\"saveToolResult('Procentn\u00ed zm\u011bna', 'change')\">Do historie<\/button>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"side-tool-box\">\r\n      <h4>Sleva a nov\u00e1 cena<\/h4>\r\n      <p class=\"side-tool-help\">Zadejte p\u016fvodn\u00ed cenu a procento slevy. N\u00e1stroj spo\u010d\u00edt\u00e1 novou cenu i to, kolik u\u0161et\u0159\u00edte.<\/p>\r\n\r\n      <label for=\"discountBase\"><b>P\u016fvodn\u00ed cena (K\u010d):<\/b><\/label>\r\n      <input type=\"text\" id=\"discountBase\" value=\"1 999\" oninput=\"formatToolInput(this); updateDiscountTool()\">\r\n\r\n      <label for=\"discountPercent\"><b>Sleva (%):<\/b><\/label>\r\n      <input type=\"number\" id=\"discountPercent\" value=\"20\" step=\"0.01\" oninput=\"updateDiscountTool()\">\r\n\r\n      <div class=\"side-tool-result\">Cena po slev\u011b: <span id=\"discountResult\">0<\/span> K\u010d<\/div>\r\n      <div class=\"side-tool-subresult\">U\u0161et\u0159\u00edte: <span id=\"discountSaved\">0<\/span> K\u010d<\/div>\r\n\r\n      <div class=\"side-tool-actions\">\r\n        <button type=\"button\" onclick=\"useToolResult('discount')\">Pou\u017e\u00edt<\/button>\r\n        <button type=\"button\" onclick=\"saveToolResult('Sleva \/ ak\u010dn\u00ed cena', 'discount')\">Do historie<\/button>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"side-tool-box\">\r\n      <h4>Pom\u011br \/ p\u0159epo\u010det pom\u011bru<\/h4>\r\n      <p class=\"side-tool-help\">Zadejte zn\u00e1m\u00fd pom\u011br a novou hodnotu. N\u00e1stroj spo\u010d\u00edt\u00e1 odpov\u00eddaj\u00edc\u00ed v\u00fdsledek podle stejn\u00e9ho pom\u011bru.<\/p>\r\n\r\n      <label for=\"ratioKnownA\"><b>Zn\u00e1m\u00e1 hodnota A:<\/b><\/label>\r\n      <input type=\"text\" id=\"ratioKnownA\" value=\"3\" oninput=\"formatToolInput(this); updateRatioTool()\">\r\n\r\n      <label for=\"ratioKnownB\"><b>Odpov\u00eddaj\u00edc\u00ed hodnota B:<\/b><\/label>\r\n      <input type=\"text\" id=\"ratioKnownB\" value=\"120\" oninput=\"formatToolInput(this); updateRatioTool()\">\r\n\r\n      <label for=\"ratioNewA\"><b>Nov\u00e1 hodnota A:<\/b><\/label>\r\n      <input type=\"text\" id=\"ratioNewA\" value=\"7\" oninput=\"formatToolInput(this); updateRatioTool()\">\r\n\r\n      <div class=\"side-tool-result\">V\u00fdsledek pro novou hodnotu: <span id=\"ratioResult\">0<\/span><\/div>\r\n\r\n      <div class=\"side-tool-actions\">\r\n        <button type=\"button\" onclick=\"useToolResult('ratio')\">Pou\u017e\u00edt<\/button>\r\n        <button type=\"button\" onclick=\"saveToolResult('Pom\u011br \/ p\u0159epo\u010det pom\u011bru', 'ratio')\">Do historie<\/button>\r\n      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"calculator-history-box\">\r\n    <div class=\"calculator-history-header\">\r\n      <h4 style=\"margin: 0;\">HISTORIE V\u00ddPO\u010cT\u016e<\/h4>\r\n      <button type=\"button\" onclick=\"clearHistory()\">Smazat v\u0161e<\/button>\r\n    <\/div>\r\n\r\n    <div id=\"calculatorHistoryList\" class=\"calculator-history-list\"><\/div>\r\n  <\/div>\r\n<\/div>\r\n\r\n<style>\r\n  .smart-calculator-layout\r\n  {\r\n    display: flex;\r\n    flex-direction: column;\r\n    gap: 20px;\r\n  }\r\n\r\n  .smart-calculator-box,\r\n  .calculator-history-box,\r\n  .side-tool-box\r\n  {\r\n    background: #ffffff;\r\n    border: 1px solid #e8e8e8;\r\n    border-radius: 18px;\r\n    padding: 18px;\r\n    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);\r\n  }\r\n\r\n  .smart-calculator-box\r\n  {\r\n    width: 100%;\r\n    max-width: 100%;\r\n  }\r\n\r\n  .calculator-display-wrap\r\n  {\r\n    background: #f8f8f8;\r\n    border-radius: 14px;\r\n    padding: 14px;\r\n    margin-bottom: 14px;\r\n    min-height: 92px;\r\n    display: flex;\r\n    flex-direction: column;\r\n    justify-content: center;\r\n  }\r\n\r\n  .calculator-expression\r\n  {\r\n    font-size: 16px;\r\n    color: #666666;\r\n    word-break: break-word;\r\n    min-height: 24px;\r\n  }\r\n\r\n  .calculator-result\r\n  {\r\n    font-size: 32px;\r\n    font-weight: bold;\r\n    color: #ee7b68;\r\n    word-break: break-word;\r\n    line-height: 1.2;\r\n  }\r\n\r\n  .calculator-actions-top,\r\n  .calculator-grid\r\n  {\r\n    display: grid;\r\n    gap: 10px;\r\n  }\r\n\r\n  .calculator-actions-top\r\n  {\r\n    grid-template-columns: repeat(4, 1fr);\r\n    margin-bottom: 10px;\r\n  }\r\n\r\n  .calculator-grid\r\n  {\r\n    grid-template-columns: repeat(4, 1fr);\r\n  }\r\n\r\n  .smart-calculator-box button,\r\n  .calculator-history-box button,\r\n  .side-tool-box button\r\n  {\r\n    border: 0;\r\n    border-radius: 12px;\r\n    padding: 14px 12px;\r\n    font-size: 18px;\r\n    cursor: pointer;\r\n    background: #f3f3f3;\r\n    transition: 0.2s ease;\r\n  }\r\n\r\n  .smart-calculator-box button:hover,\r\n  .calculator-history-box button:hover,\r\n  .side-tool-box button:hover\r\n  {\r\n    background: #ebebeb;\r\n  }\r\n\r\n  .calculator-equals\r\n  {\r\n    background: #ee7b68 !important;\r\n    color: #ffffff;\r\n    font-weight: bold;\r\n  }\r\n\r\n  .calculator-equals:hover\r\n  {\r\n    background: #e36e5e !important;\r\n  }\r\n\r\n  .calculator-tools-grid\r\n  {\r\n    display: grid;\r\n    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));\r\n    gap: 20px;\r\n  }\r\n\r\n  .side-tool-box\r\n  {\r\n    height: 100%;\r\n  }\r\n\r\n  .side-tool-box h4\r\n  {\r\n    margin: 0 0 10px 0;\r\n  }\r\n\r\n  .side-tool-help\r\n  {\r\n    font-size: 14px;\r\n    color: #666666;\r\n    margin: 0 0 12px 0;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .side-tool-box label\r\n  {\r\n    display: block;\r\n    margin-bottom: 4px;\r\n    font-size: 14px;\r\n  }\r\n\r\n  .side-tool-box input\r\n  {\r\n    width: 100%;\r\n    box-sizing: border-box;\r\n    margin-top: 0;\r\n    margin-bottom: 12px;\r\n    padding: 12px 14px;\r\n    border: 1px solid #dddddd;\r\n    border-radius: 12px;\r\n    font-size: 16px;\r\n  }\r\n\r\n  .side-tool-result\r\n  {\r\n    font-size: 16px;\r\n    margin-top: 4px;\r\n    margin-bottom: 8px;\r\n  }\r\n\r\n  .side-tool-result span,\r\n  .side-tool-subresult span\r\n  {\r\n    color: #ee7b68;\r\n    font-weight: bold;\r\n  }\r\n\r\n  .side-tool-subresult\r\n  {\r\n    font-size: 14px;\r\n    color: #666666;\r\n    margin-bottom: 12px;\r\n  }\r\n\r\n  .side-tool-actions\r\n  {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 8px;\r\n  }\r\n\r\n  .side-tool-actions button\r\n  {\r\n    font-size: 14px;\r\n    padding: 10px 12px;\r\n  }\r\n\r\n  .calculator-history-header\r\n  {\r\n    display: flex;\r\n    justify-content: space-between;\r\n    align-items: center;\r\n    gap: 10px;\r\n    margin-bottom: 14px;\r\n    flex-wrap: wrap;\r\n  }\r\n\r\n  .calculator-history-list\r\n  {\r\n    display: flex;\r\n    flex-direction: column;\r\n    gap: 10px;\r\n  }\r\n\r\n  .calculator-history-item\r\n  {\r\n    background: #f8f8f8;\r\n    border-radius: 12px;\r\n    padding: 12px;\r\n  }\r\n\r\n  .calculator-history-expression\r\n  {\r\n    font-size: 14px;\r\n    color: #666666;\r\n    margin-bottom: 4px;\r\n    word-break: break-word;\r\n  }\r\n\r\n  .calculator-history-result\r\n  {\r\n    font-size: 20px;\r\n    font-weight: bold;\r\n    color: #ee7b68;\r\n    margin-bottom: 8px;\r\n    word-break: break-word;\r\n  }\r\n\r\n  .calculator-history-time\r\n  {\r\n    font-size: 12px;\r\n    color: #999999;\r\n    margin-bottom: 10px;\r\n  }\r\n\r\n  .calculator-history-actions\r\n  {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 8px;\r\n  }\r\n\r\n  .calculator-history-actions button\r\n  {\r\n    padding: 8px 10px;\r\n    font-size: 14px;\r\n  }\r\n\r\n  .calculator-empty-history\r\n  {\r\n    color: #777777;\r\n    font-size: 15px;\r\n  }\r\n\r\n  @media (max-width: 680px)\r\n  {\r\n    .calculator-tools-grid\r\n    {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<script>\r\n  let calculatorExpression = '';\r\n  let calculatorHistory = [];\r\n\r\n  function formatNumberForDisplay(_num)\r\n  {\r\n    const _number = Number(_num);\r\n\r\n    if (!isFinite(_number))\r\n    {\r\n      return 'Chyba';\r\n    }\r\n\r\n    return _number.toLocaleString('cs-CZ', {\r\n      maximumFractionDigits: 10\r\n    });\r\n  }\r\n\r\n  function formatMoneyForDisplay(_num)\r\n  {\r\n    const _number = Number(_num);\r\n\r\n    if (!isFinite(_number))\r\n    {\r\n      return '0';\r\n    }\r\n\r\n    return _number.toLocaleString('cs-CZ', {\r\n      minimumFractionDigits: 2,\r\n      maximumFractionDigits: 2\r\n    });\r\n  }\r\n\r\n  function normalizeExpressionForEval(_expression)\r\n  {\r\n    let _normalized = _expression;\r\n    _normalized = _normalized.replace(\/,\/g, '.');\r\n    return _normalized;\r\n  }\r\n\r\n  function formatExpressionForDisplay(_expression)\r\n  {\r\n    if (!_expression)\r\n    {\r\n      return '0';\r\n    }\r\n\r\n    return _expression\r\n      .replace(\/\\*\/g, '\u00d7')\r\n      .replace(\/\\\/\/g, '\u00f7');\r\n  }\r\n\r\n  function updateCalculatorDisplay()\r\n  {\r\n    const _expressionElement = document.getElementById('calculatorExpression');\r\n    const _resultElement = document.getElementById('calculatorResult');\r\n\r\n    _expressionElement.textContent = formatExpressionForDisplay(calculatorExpression);\r\n\r\n    if (!calculatorExpression)\r\n    {\r\n      _resultElement.textContent = '0';\r\n      return;\r\n    }\r\n\r\n    try\r\n    {\r\n      const _normalized = normalizeExpressionForEval(calculatorExpression);\r\n      const _result = Function('\"use strict\"; return (' + _normalized + ')')();\r\n\r\n      if (isFinite(_result))\r\n      {\r\n        _resultElement.textContent = formatNumberForDisplay(_result);\r\n      }\r\n      else\r\n      {\r\n        _resultElement.textContent = 'Chyba';\r\n      }\r\n    }\r\n    catch (_error)\r\n    {\r\n      _resultElement.textContent = '...';\r\n    }\r\n  }\r\n\r\n  function appendToExpression(_value)\r\n  {\r\n    if (calculatorExpression === '0')\r\n    {\r\n      calculatorExpression = '';\r\n    }\r\n\r\n    calculatorExpression += _value;\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function appendOperator(_operator)\r\n  {\r\n    if (!calculatorExpression)\r\n    {\r\n      if (_operator === '-')\r\n      {\r\n        calculatorExpression = '-';\r\n      }\r\n\r\n      updateCalculatorDisplay();\r\n      return;\r\n    }\r\n\r\n    const _lastCharacter = calculatorExpression.slice(-1);\r\n\r\n    if (['+', '-', '*', '\/'].includes(_lastCharacter))\r\n    {\r\n      calculatorExpression = calculatorExpression.slice(0, -1) + _operator;\r\n    }\r\n    else\r\n    {\r\n      calculatorExpression += _operator;\r\n    }\r\n\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function appendDecimal()\r\n  {\r\n    if (!calculatorExpression)\r\n    {\r\n      calculatorExpression = '0,';\r\n      updateCalculatorDisplay();\r\n      return;\r\n    }\r\n\r\n    let _lastPart = calculatorExpression.split(\/[+\\-*\/()]\/).pop();\r\n\r\n    if (_lastPart.includes(',') || _lastPart.includes('.'))\r\n    {\r\n      return;\r\n    }\r\n\r\n    if (_lastPart === '')\r\n    {\r\n      calculatorExpression += '0,';\r\n    }\r\n    else\r\n    {\r\n      calculatorExpression += ',';\r\n    }\r\n\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function deleteLastCharacter()\r\n  {\r\n    calculatorExpression = calculatorExpression.slice(0, -1);\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function clearCalculator()\r\n  {\r\n    calculatorExpression = '';\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function getCurrentResult()\r\n  {\r\n    if (!calculatorExpression)\r\n    {\r\n      return null;\r\n    }\r\n\r\n    try\r\n    {\r\n      const _normalized = normalizeExpressionForEval(calculatorExpression);\r\n      const _result = Function('\"use strict\"; return (' + _normalized + ')')();\r\n\r\n      if (!isFinite(_result))\r\n      {\r\n        return null;\r\n      }\r\n\r\n      return _result;\r\n    }\r\n    catch (_error)\r\n    {\r\n      return null;\r\n    }\r\n  }\r\n\r\n  function addHistoryItem(_expression, _result)\r\n  {\r\n    const _historyItem = {\r\n      expression: _expression,\r\n      result: _result,\r\n      time: new Date().toLocaleString('cs-CZ')\r\n    };\r\n\r\n    calculatorHistory.unshift(_historyItem);\r\n\r\n    if (calculatorHistory.length > 30)\r\n    {\r\n      calculatorHistory = calculatorHistory.slice(0, 30);\r\n    }\r\n\r\n    saveHistory();\r\n    renderHistory();\r\n  }\r\n\r\n  function calculateExpression()\r\n  {\r\n    const _result = getCurrentResult();\r\n\r\n    if (_result === null)\r\n    {\r\n      document.getElementById('calculatorResult').textContent = 'Chyba';\r\n      return;\r\n    }\r\n\r\n    addHistoryItem(calculatorExpression, _result);\r\n\r\n    calculatorExpression = String(_result).replace(\/\\.\/g, ',');\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function saveHistory()\r\n  {\r\n    localStorage.setItem('smartCalculatorHistory', JSON.stringify(calculatorHistory));\r\n  }\r\n\r\n  function loadHistory()\r\n  {\r\n    try\r\n    {\r\n      const _savedHistory = localStorage.getItem('smartCalculatorHistory');\r\n\r\n      if (_savedHistory)\r\n      {\r\n        calculatorHistory = JSON.parse(_savedHistory);\r\n      }\r\n      else\r\n      {\r\n        calculatorHistory = [];\r\n      }\r\n    }\r\n    catch (_error)\r\n    {\r\n      calculatorHistory = [];\r\n    }\r\n  }\r\n\r\n  function useHistoryResult(_index)\r\n  {\r\n    if (!calculatorHistory[_index])\r\n    {\r\n      return;\r\n    }\r\n\r\n    calculatorExpression = String(calculatorHistory[_index].result).replace(\/\\.\/g, ',');\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function copyHistoryResult(_index)\r\n  {\r\n    if (!calculatorHistory[_index])\r\n    {\r\n      return;\r\n    }\r\n\r\n    const _value = String(calculatorHistory[_index].result).replace(\/\\.\/g, ',');\r\n\r\n    if (navigator.clipboard && navigator.clipboard.writeText)\r\n    {\r\n      navigator.clipboard.writeText(_value);\r\n    }\r\n  }\r\n\r\n  function deleteHistoryItem(_index)\r\n  {\r\n    calculatorHistory.splice(_index, 1);\r\n    saveHistory();\r\n    renderHistory();\r\n  }\r\n\r\n  function clearHistory()\r\n  {\r\n    calculatorHistory = [];\r\n    saveHistory();\r\n    renderHistory();\r\n  }\r\n\r\n  function renderHistory()\r\n  {\r\n    const _historyList = document.getElementById('calculatorHistoryList');\r\n\r\n    if (!calculatorHistory.length)\r\n    {\r\n      _historyList.innerHTML = '<div class=\"calculator-empty-history\">Zat\u00edm tu nen\u00ed \u017e\u00e1dn\u00fd v\u00fdpo\u010det.<\/div>';\r\n      return;\r\n    }\r\n\r\n    let _html = '';\r\n\r\n    calculatorHistory.forEach(function(_item, _index)\r\n    {\r\n      _html += `\r\n        <div class=\"calculator-history-item\">\r\n          <div class=\"calculator-history-expression\">${formatExpressionForDisplay(_item.expression)}<\/div>\r\n          <div class=\"calculator-history-result\">= ${formatNumberForDisplay(_item.result)}<\/div>\r\n          <div class=\"calculator-history-time\">${_item.time}<\/div>\r\n          <div class=\"calculator-history-actions\">\r\n            <button type=\"button\" onclick=\"useHistoryResult(${_index})\">Pou\u017e\u00edt v\u00fdsledek<\/button>\r\n            <button type=\"button\" onclick=\"copyHistoryResult(${_index})\">Kop\u00edrovat<\/button>\r\n            <button type=\"button\" onclick=\"deleteHistoryItem(${_index})\">Smazat<\/button>\r\n          <\/div>\r\n        <\/div>\r\n      `;\r\n    });\r\n\r\n    _historyList.innerHTML = _html;\r\n  }\r\n\r\n  function formatToolInput(input)\r\n  {\r\n    let value = input.value.replace(\/\\s\/g, '').replace(',', '.').replace(\/[^0-9.]\/g, '');\r\n    let parts = value.split('.');\r\n\r\n    if (parts.length > 2)\r\n    {\r\n      value = parts[0] + '.' + parts.slice(1).join('');\r\n      parts = value.split('.');\r\n    }\r\n\r\n    let integerPart = parts[0] ? parseInt(parts[0], 10).toLocaleString('cs-CZ') : '';\r\n    let decimalPart = parts.length > 1 ? ',' + parts[1].slice(0, 2) : '';\r\n\r\n    input.value = integerPart + decimalPart;\r\n  }\r\n\r\n  function parseToolInput(value)\r\n  {\r\n    return parseFloat(String(value).replace(\/\\s\/g, '').replace(',', '.')) || 0;\r\n  }\r\n\r\n  function updateIncreaseTool()\r\n  {\r\n    const _base = parseToolInput(document.getElementById('increaseBase').value);\r\n    const _percent = parseFloat(document.getElementById('increasePercent').value) || 0;\r\n    const _result = _base * (1 + (_percent \/ 100));\r\n\r\n    document.getElementById('increaseResult').textContent = formatMoneyForDisplay(_result);\r\n    return _result;\r\n  }\r\n\r\n  function updateDecreaseTool()\r\n  {\r\n    const _base = parseToolInput(document.getElementById('decreaseBase').value);\r\n    const _percent = parseFloat(document.getElementById('decreasePercent').value) || 0;\r\n    const _result = _base * (1 - (_percent \/ 100));\r\n\r\n    document.getElementById('decreaseResult').textContent = formatMoneyForDisplay(_result);\r\n    return _result;\r\n  }\r\n\r\n  function updatePercentOfTool()\r\n  {\r\n    const _base = parseToolInput(document.getElementById('percentOfBase').value);\r\n    const _percent = parseFloat(document.getElementById('percentOfPercent').value) || 0;\r\n    const _result = _base * (_percent \/ 100);\r\n\r\n    document.getElementById('percentOfResult').textContent = formatMoneyForDisplay(_result);\r\n    return _result;\r\n  }\r\n\r\n  function updateChangeTool()\r\n  {\r\n    const _original = parseToolInput(document.getElementById('changeOriginal').value);\r\n    const _newValue = parseToolInput(document.getElementById('changeNew').value);\r\n    let _result = 0;\r\n\r\n    if (_original !== 0)\r\n    {\r\n      _result = ((_newValue - _original) \/ _original) * 100;\r\n    }\r\n\r\n    document.getElementById('changeResult').textContent = formatMoneyForDisplay(_result);\r\n    return _result;\r\n  }\r\n\r\n  function updateDiscountTool()\r\n  {\r\n    const _base = parseToolInput(document.getElementById('discountBase').value);\r\n    const _percent = parseFloat(document.getElementById('discountPercent').value) || 0;\r\n    const _saved = _base * (_percent \/ 100);\r\n    const _result = _base - _saved;\r\n\r\n    document.getElementById('discountResult').textContent = formatMoneyForDisplay(_result);\r\n    document.getElementById('discountSaved').textContent = formatMoneyForDisplay(_saved);\r\n\r\n    return _result;\r\n  }\r\n\r\n  function updateRatioTool()\r\n  {\r\n    const _knownA = parseToolInput(document.getElementById('ratioKnownA').value);\r\n    const _knownB = parseToolInput(document.getElementById('ratioKnownB').value);\r\n    const _newA = parseToolInput(document.getElementById('ratioNewA').value);\r\n\r\n    let _result = 0;\r\n\r\n    if (_knownA !== 0)\r\n    {\r\n      _result = (_newA * _knownB) \/ _knownA;\r\n    }\r\n\r\n    document.getElementById('ratioResult').textContent = formatMoneyForDisplay(_result);\r\n    return _result;\r\n  }\r\n\r\n  function getToolResult(_toolName)\r\n  {\r\n    if (_toolName === 'increase')\r\n    {\r\n      return updateIncreaseTool();\r\n    }\r\n    else if (_toolName === 'decrease')\r\n    {\r\n      return updateDecreaseTool();\r\n    }\r\n    else if (_toolName === 'percentOf')\r\n    {\r\n      return updatePercentOfTool();\r\n    }\r\n    else if (_toolName === 'change')\r\n    {\r\n      return updateChangeTool();\r\n    }\r\n    else if (_toolName === 'discount')\r\n    {\r\n      return updateDiscountTool();\r\n    }\r\n    else if (_toolName === 'ratio')\r\n    {\r\n      return updateRatioTool();\r\n    }\r\n\r\n    return 0;\r\n  }\r\n\r\n  function useToolResult(_toolName)\r\n  {\r\n    const _result = getToolResult(_toolName);\r\n    calculatorExpression = String(_result).replace(\/\\.\/g, ',');\r\n    updateCalculatorDisplay();\r\n  }\r\n\r\n  function saveToolResult(_label, _toolName)\r\n  {\r\n    const _result = getToolResult(_toolName);\r\n    addHistoryItem(_label, _result);\r\n  }\r\n\r\n  document.addEventListener('keydown', function(_event)\r\n  {\r\n    const _tag = (_event.target.tagName || '').toLowerCase();\r\n\r\n    if (_tag === 'input' || _tag === 'textarea' || _tag === 'select')\r\n    {\r\n      return;\r\n    }\r\n\r\n    const _key = _event.key;\r\n\r\n    if ((\/^[0-9]$\/).test(_key))\r\n    {\r\n      appendToExpression(_key);\r\n    }\r\n    else if (_key === '+' || _key === '-' || _key === '*' || _key === '\/')\r\n    {\r\n      appendOperator(_key);\r\n    }\r\n    else if (_key === ',' || _key === '.')\r\n    {\r\n      appendDecimal();\r\n    }\r\n    else if (_key === '(' || _key === ')')\r\n    {\r\n      appendToExpression(_key);\r\n    }\r\n    else if (_key === 'Enter' || _key === '=')\r\n    {\r\n      _event.preventDefault();\r\n      calculateExpression();\r\n    }\r\n    else if (_key === 'Backspace')\r\n    {\r\n      deleteLastCharacter();\r\n    }\r\n    else if (_key === 'Escape')\r\n    {\r\n      clearCalculator();\r\n    }\r\n  });\r\n\r\n  loadHistory();\r\n  renderHistory();\r\n  updateCalculatorDisplay();\r\n  updateIncreaseTool();\r\n  updateDecreaseTool();\r\n  updatePercentOfTool();\r\n  updateChangeTool();\r\n  updateDiscountTool();\r\n  updateRatioTool();\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\u00davodn\u00ed str\u00e1nka Aplikace V\u00fdukov\u00e9 materi\u00e1ly Speci\u00e1ln\u00ed nab\u00eddka Kontakt Chytr\u00e1 kalkula\u010dka Po\u010d\u00edtejte s histori\u00ed, procenty, slevami i p\u0159epo\u010dtem pom\u011bru V\u0161echny n\u00e1stroje 0 0 C \u232b ( ) 7 8 9 \u00f7 4 5 6 \u00d7 1 2 3 &#8211; 0 , + = Nav\u00fd\u0161en\u00ed \u010d\u00e1stky o procenta Zadejte p\u016fvodn\u00ed \u010d\u00e1stku a procento nav\u00fd\u0161en\u00ed. N\u00e1stroj spo\u010d\u00edt\u00e1 novou [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3880,"parent":611,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"elementor_canvas","meta":{"footnotes":""},"class_list":["post-3862","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chytr\u00e1 online kalkula\u010dka | ELEMENTER<\/title>\n<meta name=\"description\" content=\"Online kalkula\u010dka s histori\u00ed v\u00fdpo\u010dt\u016f, procenty, slevami a p\u0159epo\u010dtem pom\u011bru. 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