Today, Let me guide you through on how to create cascading dropdown lists by using JQuery.
Here is a simple demo. Please look at the "Deal" section down the right hand side column.
.
1. Include jqury.js. You can get JQuery from here.
<script language=”javascript” src=”jquery.js”></script>
2. Write this simple function in a javascript block in head.
function makeSublist(parent,child,isSubselectOptional,childVal) { $("body").append("<select style='display:none' id='" parent child "'></select>"); $('#' parent child).html($("#" child " option")); var parentValue = $('#' parent).attr('value'); $('#' child).html($("#" parent child " .sub_" parentValue).clone()); childVal = (typeof childVal == "undefined")? "" : childVal ; $("#" child ' option[@value="' childVal '"]').attr('selected','selected'); $('#' parent).change( function() { var parentValue = $('#' parent).attr('value'); $('#' child).html($("#" parent child " .sub_" parentValue).clone()); if(isSubselectOptional) $('#' child).prepend("<option value='none'> -- Select District -- </option>"); $('#' child).trigger("change"); $('#' child).focus(); } ); }This function takes 4 arguments: the parent select input’s id, the child select input’s id, and a boolean value to indicate whether to select an item from child list by default.
For example: makeSublist(’Regions’,'Districts’,false, 1);
This function will make the options of ‘Districts’ list depending on the selection of ‘Regions’. And user have to select
a location from ‘Districts’.
Here ‘Regions’ and ‘Districts’ are the IDs of parent and child select input respectively.
3. Add a class to the ‘<option>’s of the child list box. The class name will be the value of it’s parent ‘<option>’ in parent Districtsox with a ’sub_’ prefix.
Suppose, in parent Districtsox there is an item “Auckland”. Its value is ‘akl’:
<option value="akl">Auckland</option>When the item "Auckland" will be selected, the sub-items should be visible in child Districtsox. These items should hold the class name ’sub_akl’:
<option class="sub_akl" value="Auckland City">Auckland City</option> <option class="sub_akl" value="Rodney">Rodney</option> <option class="sub_akl" value="North Shore">North Shore</option>
4. Now you are ready. On ‘$(document).ready’ event of Jquery, run the function to associate your list boxes.
$(document).ready(function() { makeSublist(’parentID’,'childID’, false, 1); });
5. Testing out! and Questions??
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