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    <p>I prefer data structure like this:</p> <pre><code>var carMakers = [ { name: 'Honda', models: [ { name: 'Accord', features: ['2dr', '4dr'] }, { name: 'CRV', features: ['2dr', 'Hatchback'] }, { name: 'Pilot', features: ['base', 'superDuper'] } ]}, { name: 'Toyota', models: [ { name: 'Prius', features: ['green', 'superGreen'] }, { name: 'Camry', features: ['sporty', 'square'] }, { name: 'Corolla', features: ['cheap', 'superFly'] } ]} ]; </code></pre> <p>Given the three select lists with id's: 'maker', 'model' and 'features' you can manipulate them with this (I believe this is pretty self explanatory):</p> <pre><code>// returns array of elements whose 'prop' property is 'value' function filterByProperty(arr, prop, value) { return $.grep(arr, function (item) { return item[prop] == value }); } // populates select list from array of items given as objects: { name: 'text', value: 'value' } function populateSelect(el, items) { el.options.length = 0; if (items.length &gt; 0) el.options[0] = new Option('please select', ''); $.each(items, function () { el.options[el.options.length] = new Option(this.name, this.value); }); } // initialization $(document).ready(function () { // populating 1st select list populateSelect($('#maker').get(0), $.map(carMakers, function(maker) { return { name: maker.name, value: maker.name} })); // populating 2nd select list $('#maker').bind('change', function() { var makerName = this.value, carMaker = filterByProperty(carMakers, 'name', makerName), models = []; if (carMaker.length &gt; 0) models = $.map(carMaker[0].models, function(model) { return { name: model.name, value: makerName + '.' + model.name} }); populateSelect($('#model').get(0), models); $('#model').trigger('change'); }); // populating 3rd select list $('#model').bind('change', function () { var nameAndModel = this.value.split('.'), features = []; if (2 == nameAndModel.length) { var makerName = nameAndModel[0], carModel = nameAndModel[1], carMaker = filterByProperty(carMakers, 'name', makerName); if (carMaker.length &gt; 0) { var model = filterByProperty(carMaker[0].models, 'name', carModel) if (model.length &gt; 0) features = $.map(model[0].features, function(feature) { return { name: feature, value: makerName + '.' + carModel + '.' + feature} }) } } populateSelect($('#feature').get(0), features); }) // alerting value on 3rd select list change $('#feature').bind('change', function () { if (this.value.length &gt; 0) alert(this.value); }) }); </code></pre>
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    1. POUsing javascript and jquery, to populate related select boxes with array structure
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    1. USMarko Dumic
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    1. COthanks for the effort you put into your answer. I tried your code and it worked, but I don't have time right now to learn exactly how it works...will come back to it later..but I'm using the array structure...and I think I now understand how to create these arrays. Thanks again
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      1. USJay Corbett
    2. COThe data structure is actually a Javascript object. You can find here a decent JSON tutorial: http://www.hunlock.com/blogs/Mastering_JSON_%28_JavaScript_Object_Notation_%29
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    3. COUsing $.grep and $.map for this is just the masters stroke. Fantastic solution, I just used it as a basis for something similar and feel like a better programmer for it. Awesome solution.
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