javascript - Get keycode/key from string -


i have select tag in giving option f1 f10..now when user press button 1 f1 f10 have detect.

<select id="forward_ckey">     <option value="default"></option>     <option value="esc" disabled>esc</option>     <option value="f1">f1</option>     <option value="f2" disabled>f2</option>     <option value="f3" selected>f3</option>     <option value="f4" disabled>f4</option>     <option value="f5" disabled>f5</option>     <option value="f6">f6</option>     <option value="f7">f7</option>     <option value="f8">f8</option>     <option value="f9">f9</option>     <option value="f10">f10</option>     <option value="f11">f11</option>     <option value="f12">f12</option> </select>      $(document).unbind('keydown.g').bind('keydown.g', function (e) {         var unicode = e.keycode;                     if (unicode == 'selected value keycode') { //here "f3" keycode

output: if press f3 , selected value f3 should execute code block in that.. main problem facing got f3 option value , getting keycode keypress how match both..either need key of pressed keyboard or keycode of selected value option

demo

           var selected_id = "";             $('select').on('change', function() {               selected_id = this.value;             });             $(document).bind('keydown', function(e) {               var unicode = e.keycode;               alert("");               if (unicode == selected_id) { //f3 keycode or key `e`                 alert("");               }             });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <select id="play_ckey">    <option value="default"></option>    <option value="esc" selected>esc</option>    <option value="f1">f1</option>    <option value="f2" disabled>f2</option>    <option value="f3" disabled>f3</option>    <option value="f4" disabled>f4</option>    <option value="f5" disabled>f5</option>    <option value="f6">f6</option>    <option value="f7">f7</option>    <option value="f8">f8</option>    <option value="f9">f9</option>    <option value="f10">f10</option>    <option value="f11">f11</option>    <option value="f12">f12</option>  </select>

i got value selected option how can key pressed user or keycode of selected value option match in condition?

to keycode of corresponding selected value need this:

var keycodes = {'f1': 112, 'f2': 113, 'f3': 114, …}; var selectedvalue = $('#forward_ckey').val(); var selectedkeycode = keycodes[selectedvalue];

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