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Tricky point – regarding Lists (li & ul)

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Dec 09.2008

Got a tricky question – don’t even know if it’s possible:

I am using the yui scripts, specifically drag and drop for lists.

I got it to work great.

But what I want to do is store in my mysql database the new position when I drag and drop so that the next time I view the page it displays the correct sort order based on how I arranged the list with drag and drop.

[B]Is there a way in javascript to read the position of a list item?[/B]

The solution I had thought up was to use JS to read this number and then update the record using AJAX.

Does this seem right?

Thanks

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JavaScript

4 Comments(s) ↴

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@CuppyTeaDec 09.2008 — Got a tricky question - don't even know if it's possible:

I am using the yui scripts, specifically drag and drop for lists.

I got it to work great.

But what I want to do is store in my mysql database the new position when I drag and drop so that the next time I view the page it displays the correct sort order based on how I arranged the list with drag and drop.

[B]Is there a way in javascript to read the position of a list item?[/B]

The solution I had thought up was to use JS to read this number and then update the record using AJAX.

Does this seem right?

Thanks[/QUOTE]

Yes.

document.getElementById("theUl").childNodes is your new best friend. He is an array which contains the <li> elements in the order they are displayed,
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@saturnprodsauthorDec 09.2008 — Yes.

document.getElementById("theUl").childNodes is your new best friend. He is an array which contains the <li> elements in the order they are displayed,[/QUOTE]

Thanks! Do you know of any link or page where I can learn more about this?
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@CuppyTeaDec 12.2008 — Thanks! Do you know of any link or page where I can learn more about this?[/QUOTE]

Humm.. you might have found out yourself by now, but if not....

I don't know any specific "amazing" resource- prehaps google will help.

Say you have....

[CODE]<script>
window.onload = init;

function init() {
for(var i=0;i<document.getElementById("nav").childNodes.length;i++){
alert(document.getElementById("nav").childNodes[i].innerHTML);
}
}
</script>
</head>

<body>
<ul id="nav">
<li>List Element</li>
<li>List Element</li>
<li>List Element</li>
<li>List Element</li>
<li>List Element</li>
</ul>
</body>
</html>
[/CODE]

as an example.

All "childNodes" is, is an array of the objects contained within the tags of the element you are getting the childNodes for.

(childNodes is an array of OBJECTS - not Id's or anything).

Hope that slightly helps...
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@mrhooDec 12.2008 — document.getElementById("theUl").childNodes will include a textnode for each newline in the source, except in IE.

Better to use document.getElementById("theUl").getElementsByTagName('li')
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