php - Change select dropdown based on first select dropdown? -

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i trying change second select dropdown based on whether first selected option contains (m) or (ft).

my form html search follows:

<form id="search" action="/property_search" method="get" class="clearfix">         <select name="sqsize" id="sqsize" class="sqsize">             <option value="">sq.ft/sq.m:</option>             <option value="233.52m">233.52m</option>             <option value="233.52m">233.52m</option>             <option value="467.04m">467.04m</option>             <option value="2,513ft">2,513ft</option>             <option value="2,513ft">2,513ft</option>             <option value="5,026ft">5,026ft</option>         </select>          <select name="sqsizemin" id="sqsizemin" class="sqsizemin">             <option value="">size min:</option>         </select>          <input type="submit" class="submit" value="search">     </form>

my jquery follows:

<script type="text/javascript"> $(function(){ $('#sqsize').change(function () { var options = ''; if($(this).val() == 'm') {     options = '<option value=""></option>'; } else if ($(this).val() == 'ft') {     options = '<option value="6">6</option>'; }     $('#sqsizemin').html(options); });     $('#sqsize').trigger('change'); });

try this(using indexof):

$(function(){ $("#sqsize").change(function(){     var options = '';     if($(this).val().indexof('m') > -1) {         options = '<option value="">mm</option>';     }     else if ($(this).val().indexof('ft') > -1) {         options = '<option value="6">6</option>';     }     $('#sqsizemin').html(options);         }); });

working fiddle: https://jsfiddle.net/robertrozas/b0w61quf/


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