[jquery] jQuery Determine if a matched class has a given id

What is jQuery has id equivalent of the following statement?

$('#mydiv').hasClass('foo')

so you could give a class name and check that it contains a supplied id.

something like:

$('.mydiv').hasId('foo')

Check if element's ID is exist

if ($('#id').attr('id') == 'id')_x000D_
{_x000D_
  //OK_x000D_
}

I would probably use $('.mydiv').is('#foo'); That said if you know the Id why wouldnt you just apply it to the selector in the first place?

$('#' + theMysteryId + '.someClass').each(function() { /* do stuff */ });

You could also check if the id element is used by doing so:

if(typeof $(.div).attr('id') == undefined){
   //element has no id
} else {
   //element has id selector
}

I use this method for global dataTables and specific ordered dataTables

update: sorry misunderstood the question, removed .has() answer.

another alternative way, create .hasId() plugin

// the plugin_x000D_
$.fn.hasId = function(id) {_x000D_
  return this.attr('id') == id;_x000D_
};_x000D_
_x000D_
// select first class_x000D_
$('.mydiv').hasId('foo') ?_x000D_
  console.log('yes') : console.log('no');_x000D_
_x000D_
// select second class_x000D_
// $('.mydiv').eq(1).hasId('foo')_x000D_
// or_x000D_
$('.mydiv:eq(1)').hasId('foo') ?_x000D_
  console.log('yes') : console.log('no');

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
<div class="mydiv" id="foo"></div>_x000D_
<div class="mydiv"></div>

Just to say I eventually solved this using index().

NOTHING else seemed to work.

So for sibling elements this is a good work around if you are first selecting by a common class and then want to modify something differently for each specific one.

EDIT: for those who don't know (like me) index() gives an index value for each element that matches the selector, counting from 0, depending on their order in the DOM. As long as you know how many elements there are with class="foo" you don't need an id.

Obviously this won't always help, but someone might find it useful.

Let's say that you're iterating through some DOM objects and you wanna find and catch an element with a certain ID

<div id="myDiv">
    <div id="fo"><div>
    <div id="bar"><div>
</div>

You can either write something like to find

$('#myDiv').find('#bar')

Note that if you were to use a class selector, the find method will return all the matching elements.

or you could write an iterating function that will do more advanced work

<div id="myDiv">
    <div id="fo"><div>
    <div id="bar"><div>
    <div id="fo1"><div>
    <div id="bar1"><div>
    <div id="fo2"><div>
    <div id="bar2"><div>
</div>

$('#myDiv div').each(function() {
   if($(this).attr('id') == 'bar1')
       //do something with bar1
});

Same code could be easily modified for class selector.

<div id="myDiv">
    <div class="fo"><div>
    <div class="bar"><div>
    <div class="fo"><div>
    <div class="bar"><div>
    <div class="fo"><div>
    <div class="bar"><div>
</div>

$('#myDiv div').each(function() {
   if($(this).hasClass('bar'))
       //do something with bar
});

I'm glad you solved your problem with index(), what ever works for you.I hope this will help others with the same problem. Cheers :)