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POHow to get the value of n-th item in a JSON list (using JQuery)?
 

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  1. POHow to get the value of n-th item in a JSON list (using JQuery)?
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    <p>How do I retrieve the <em>n</em>-th value in a JSON file (and maybe it's children, too)?</p> <p>For example, I have a collection of courses and associated events formatted in JSON, which I'm using to populate a couple of select lists, e.g:</p> <pre><code>// extract from courselist.php [{ "optionValue": "Getting Research into Practice", "events": [ {"date": "29 October"} ] }, { "optionValue": "Human Resources for Managers", "events": [ {"date": "September 1"}, {"date": "November 2"} ] }] </code></pre> <p>I'm doing this to create the form from that JSON:</p> <pre><code>$(function(){ $("select#coursetype").change(function(){ $.getJSON("courselist.php",{id: $(this).val(), ajax: 'true'}, function(data){ var options = ''; //item in select list options += '&lt;option value=""&gt;&lt;/option&gt;'; for (var i = 0; i &lt; data.length; i++) { options += '&lt;option value="' + [i] + '"&gt;' + data[i].optionValue + '&lt;/option&gt;'; $("#courselist").html(options); $('#courselist option:first').attr('selected', 'selected'); }; }) }) }); </code></pre> <p>..which outputs HTML along the lines of:</p> <pre><code>&lt;select id="coursetype" name="coursetype"&gt; &lt;option value="0"&gt;Getting Research into Practice&lt;/option&gt; &lt;option value="1"&gt;Human Resources for Managers&lt;/option&gt; &lt;/select&gt; </code></pre> <p>Say, the user selects 'Human Resources for Managers' (value="1"), and $_POSTs the form, how can I later retrieve that course name and it's event info from the POST value? </p>
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