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im a css/designer guy so please excuse my lameness in not knowing any .js

basically i want to know how to add an auto incremental id to a list item with javascript / jquery for something that i am trying to add some css to.

before

<li id=""><a href="">Item number 1</a></li>
<li id=""><a href="">Item number 2</a></li>
<li id=""><a href="">Item number 3</a></li>

after

<li id="1"><a href="">Item number 1</a></li>
<li id="2"><a href="">Item number 2</a></li>
<li id="3"><a href="">Item number 3</a></li>

thanks in advance and especially just for reading this

tried all the responses, nothing has worked on a plain html page with nothing but the ul/li items.

thanks to all that tried, i have failed in a big way.....im not a coder

im a css/designer guy so please excuse my lameness in not knowing any .js

basically i want to know how to add an auto incremental id to a list item with javascript / jquery for something that i am trying to add some css to.

before

<li id=""><a href="">Item number 1</a></li>
<li id=""><a href="">Item number 2</a></li>
<li id=""><a href="">Item number 3</a></li>

after

<li id="1"><a href="">Item number 1</a></li>
<li id="2"><a href="">Item number 2</a></li>
<li id="3"><a href="">Item number 3</a></li>

thanks in advance and especially just for reading this

tried all the responses, nothing has worked on a plain html page with nothing but the ul/li items.

thanks to all that tried, i have failed in a big way.....im not a coder

  • javascript
  • jquery
Share Improve this question edited May 15, 2011 at 4:20 Pwnna 9,53821 gold badges67 silver badges94 bronze badges asked May 15, 2011 at 1:53 ckeeleyckeeley 231 gold badge1 silver badge4 bronze badges
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4 Answers 4

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I'm going to give your li tags an enpassing ul with an id in case there are other li tags on the page that you don't want to order, but in jQuery this is pretty easy for:

<ul id="ordered">
    <li><a href="">Item number 1</a></li>
    <li><a href="">Item number 2</a></li>
    <li><a href="">Item number 3</a></li>
</ul>

You would simply use the each method:

$('#ordered li').each(function(i,el){
    el.id = i+1;
});

I would remend using something other than just a plain integer for an id though, so maybe something like 'ordered' + (i+1) instead of just i+1 above.

I'm going to wrap your code in a div so it's easier to code for

<div id="increment">
<li><a href="">Item number 1</a></li>
<li><a href="">Item number 2</a></li>
<li><a href="">Item number 3</a></li>
</div>

And js would be:

function loadcode(){
    var increments = document.getElementById("increment");
    var li = increments.getElementsByTagName("li");
    for (i=0;i<li.length;i++) li[i].setAttribute("id", i+1);
}

and in your HTML:

<body onload="loadcode()">

Your tags say jQuery, so:

$("li").each(function(i){this.id = i})

So you can learn: you make a collection of HTML nodes with the $('foo') syntax. You use CSS selectors, so li will get -every- <li> on the page.

.each loops over those collected HTML elements, and does something to them. The 'something' is in the code function(i){this.id = i}. jQuery passes which loop you're on to the function as i, and the code inside the curly braces sets the id of that particular element to i.

If you need id's for styling, that's a bad idea. What you should do is use css 3 pseudo class :nth-child(n) which is in your area of css.

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