javascript - When is a DOM element "ready"? -
this might sound silly question, , tend use:
$(document).ready(function() { }); but basic question.
let's have list of elements this:
<body> <p>paragraph</p> <div>div</div> <div id="helloworld">hello, world</div> <script> var hw = $('#helloworld'); $(document).ready(function() { // hw available me here }); </script> <p>another paragraph</p> </body> it seems div available, , don't run errors, there technically wrong this? not talking organized code, curious technical question @ hand.
so suppose question is:
is dom element considered complete , available browser reads it, regardless if rest of elements have loaded yet?
it seems div available, , don't run errors, there technically wrong this?
no. long script isn't run until after element exists, can access it. script in script tag that's after markup element refers consistently, cross-browser, able access element.
always works:
<div id="foo">...</div> <script> $("#foo")... </script> never works:
<script> $("#foo")... </script> <div id="foo">...</div> works only because jquery delays executing ready callback:
<script> $(document).ready(function() { $("#foo")... }); </script> <div id="foo">...</div> this 1 of reasons the common recommendation put script tags @ end of document, before closing </body> tag. way, have access of elements defined above them. (and don't delay initial presentation of page, usually, though not always, want...)
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