Adding optgroup to JavaScript from "-folder" in array


I want to add optgroup values to a form option select that is created with JavaScript.

The group values are found in the array by "-folder-".

I have attached an example of what I want.

<p>This: <br />
var tinyMCEMediaList = [
	// Name, URL
	["-folder-", "Fruit"],
	["Apples", "images/apples.jpg"],
	["Pears", "images/pears.jpg"],
	["Peaches", "images/peaches.png"],
	["-folder-", "Sweets"],
	["Candy", "images/candy.jpg"],
	["Ice Cream", "images/icream.jpg"],
	["Cake", "images/cake.jpg"],
	["-folder-", "Veggies"],
	["Carrots", "images/carrots.jpg"],
	["Broccoli", "images/Broccoli.gif"] 
var html = getMediaListHTML('medialist','src','media','media');
function getMediaListHTML() {
	if (typeof(tinyMCEMediaList) != "undefined" && tinyMCEMediaList.length > 0) {
		var html = "";
		html += '<select id="linklist" name="linklist" style="width: 250px" onchange="this.form.src.value=this.options[this.selectedIndex].value;updatePreview();">';
		html += '<option value="">---</option>';
		for (var i=0; i<tinyMCEMediaList.length; i++)
			html += '<option value="' + tinyMCEMediaList[i][1] + '">' + tinyMCEMediaList[i][0] + '</option>';
		html += '</select>';
		return html;
	return "";
<p>Should look like this: <br />
<select id="linklist" name="linklist" style="width: 250px" onchange="this.form.src.value=this.options[this.selectedIndex].value;updatePreview();">
<option value="">---</option>
<optgroup label="Fruit">
<option value="images/apples.jpg">Apples</option>
<option value="images/pears.jpg">Pears</option>
<option value="images/peaches.png">Peaches</option>
<optgroup label="Sweets">
<option value="images/candy.jpg">Candy</option>
<option value="images/icream.jpg">Ice Cream</option>
<option value="images/cake.jpg">Cake</option>
<optgroup label="Veggies">
<option value="images/carrots.jpg">Carrots</option>
<option value="images/Broccoli.gif">Broccoli</option>

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Assuming "sel" is a select element:

var og = document.createElement('optgroup').appendChild(document.createTextNode('Fruit'));
hankknightAuthor Commented:
Thanks, Badotz, but what I want it for the JavaScript to see this:
       ["-folder-", "Fruit"]

And the JavaScript should create a folder (because it sees "-folder-") called "Fruit".
Well, you will have to "tell" javascript what to do should it encounter a folder, eh? How do you fill the select now?

Or do you fill it manually and wish to do it automatically somehow? That is a different monster ;-)
I think this is what you want:
function getMediaListHTML2()
	var html = "";
	var s=[];
	if (typeof(tinyMCEMediaList) != "undefined" && tinyMCEMediaList.length > 0)
 		var key = "";
		for (var i=0; i<tinyMCEMediaList.length; i++)
				key = tinyMCEMediaList[i][1];
				if( !s[ key ] )
					s[ key ]={};
					s[ key ].text = new Array();
					s[ key ].value = new Array();
				s[ key ].text.push(tinyMCEMediaList[i][0]);
				s[ key ].value.push(tinyMCEMediaList[i][1]);
		html +='<select id="linklist" name="linklist" style="width: 250px" onchange="this.form.src.value=this.options[this.selectedIndex].value;updatePreview();">';
		html +='<option value="">---</option>';
		for( var e in s)
			html +="<optgroup label='"+e+"'>";
				for( var j=0,limit=s[e].text.length; j < limit; ++j )
					html += "<option value='"+s[e].value[j]+"'>"+s[e].text[j]+"</option>";
			html +="</optgroup>";
return html;

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