如何定义javascript变量作为div的ID？

Question

I am trying to define a var equal to the id of a div in the body. My non-functional idea was this:

var userid = $('.all').attr('id');

Since I need the variable to be defined as the id as soon as the page loads, I am not using an event and cannot use a technique like:

$('.all').click(){
  var alldivIDvalue = $(this).attr('id');
}

Not sure if it makes a difference, but the id will equal a php output of sessions profile/username.

Answer 1

Propably you should declare somewhere in the top of your page (even in head) var userid and then after document.load append value to this variable.

var userid = []; //In html head

Then inside your jquery load:

$(document).ready(function () {
    userid = $('.all').attr('id');
});

Place where you put load doesnt matter and doesnt affect on other html bacause this event is triggered when html document is loaded.

Edit

Thanks for comment.

Answer 2

If the id is known to PHP at the time the page's HTML is built, then you can write it directly into javascript like this:

<script>
var userid = '<?php echo $userID; ?>';
</script>

When available, this approach is more straightforward than writing a value into the HTML server-side (and thence the DOM) then reading it into javascript client-side.

Of course, there's nothing to stop you writing the same value into the HTML/DOM for some other purpose.