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Self-explanatory, I hope.
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A page can't be manipulated safely until the document is "ready." jQuery detects this state of readiness for you. Code included inside $( document ).ready() will only run once the page Document Object Model (DOM) is ready for JavaScript code to execute.
The ready() method is used to make a function available after the document is loaded. Whatever code you write inside the $(document ). ready() method will run once the page DOM is ready to execute JavaScript code.
The . ready() method offers a way to run JavaScript code as soon as the page's Document Object Model (DOM) becomes safe to manipulate. This will often be a good time to perform tasks that are needed before the user views or interacts with the page, for example to add event handlers and initialize plugins.
The key difference between $(document). ready() and $(window). load() event is that the code included inside onload function will run once the entire page(images, iframes, stylesheets,etc) are loaded whereas the $(document). ready() event fires before all images,iframes etc.
Your jQuery selectors will randomly miss any elements because it is not loaded yet (by the browser).
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$(document).ready() is jQuery's way of making sure that the code you want to run on page load runs at the same time across browsers.
It also provides a mechanism to stack different functions to run on page load. If you don't use it and you have multiple onLoad assignments, only the last one added will actually run.
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