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I'm new to jQuery. I assume this was asked hundred of times, but I couldn't find an answer.

I have a page in dotnetnuke in which I know the CSS Class but I need the element ID.
In this case I know that there will be only one element with the CSS Class.
How do I find it in jQuery?

Edit:

I want to move all children of the element with class FloatingFrameLightBlue1 to be children of PopupWrapper that i created a line before. But the append doesn't seems to work. what I'm doing wrong. the code I have:

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jQuery("body").append("<div id='popupWrapper'></div>");

jQuery(".FloatingFrameLightBlue1").children().append("popupWrapper");
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Why do you need ID? – roasted 5 hours ago
1  
Shouldn't it be the other way around? You have an element with an ID, and there's only one element with that ID, and you'd like to know what class it has ? – adeneo 5 hours ago
@roasted I edited the question and added more details – Luis LL 5 hours ago

5 Answers

up vote 1 down vote accepted 
var myID = $('.knownClass').attr('id');

This selects the element by the known class and results with the ID.

Check jQuery Selectors for more information!

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up vote 1 down vote

Or use the DOM based solution (could be more efficient).

var id = $('.className').get(0).id;

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up vote 1 down vote

You can parse the ID attribute by selecting the class:

$('.name_of_the_class').attr('id');
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up vote 4 down vote

Try this code :

alert($('.myclass').attr('id'))
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up vote 0 down vote

By using $('.name_of_class').doSomething(). If you want to select by ID, you can use ('#id').doSomething().

Any other attribute: $('div[attribute="value"]').doSomething().

To return the ID, replace .doSomething() by .attr('id').

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so it seems that the problem is somewhere else. I edited and expanded my response, I would like to know what I'm doing wrong. – Luis LL 5 hours ago

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