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I'm using chrome's debugger and I'm good when it comes to setting break points once a page is running. My problem is when I do either f5 or press enter on the URL line my break points disappear. How can I set a break point in code that happens when the page first loads?
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JavaScript breakpoints When debugging JavaScript it is sometimes useful to set breakpoints. You can set breakpoints in Chrome DevTools by clicking on the line number you want to break at then press Cmd + R ( Ctrl + R ) to refresh the page. The page will then run right to that breakpoint.
1) Use Chrome's developer tools or Firebug to locate the line of JavaScript, then set the breakpoint with the mouse. To do it in Chrome, first open the developer tools (Ctl + Shift + I), or go to the wrench menu, Tools, Developer Tools. Select the Scripts tab. Click the little folder icon on the far left.
Open Google Chrome and press F12 to open Dev Tools. Go to Event Listener Breakpoints, on the right: Click on the events and interact with the target element. If the event will fire, then you will get a breakpoint in the debugger.
In Chrome's Developer Tools, go to the Sources tab. On the right, open up Event Listener Breakpoints, and you can set breakpoints on events.
It sounds as if you'll want to set your breakpoint on DOMContentLoaded, which is under the DOM Mutation section.
After you do this, reload the page and you'll end up in the debugger.
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Try putting debugger; in your code. That also works in FF's Firebug
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