In Browser Javascript editing in FireBug ?

Question

we have all luxury with Firebug , Editing Html (In-Browser ) , CSS (In-Browser ) , But if any one working with javascript , each and every time JavaScript file has to be edited and Refresh the browser . Can we not have the such facility with Javascript in FireBug ?

Thanks In Advance .

Niet the Dark Absol · Accepted Answer · 2012-01-25 06:03:52Z

2

The thing is, JavaScript is not as simple as HTML or CSS. You can change the page's contents or the style at will and it just updates, but if you change the code... well, say you change myvar = 1 to myvar = 9999999 - that's quite a difference, and that could have an enormous impact on the page. Reloading is the only way around it.

However if you have a console on Firebug, you can redefine individual functions by copying their source, replacing the contents with something new, and assigning the new function to the old one's name. Just beware that you lose the closure the function was in if you do that.

answered Jan 25, 2012 at 6:03

Niet the Dark Absol

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not2qubit Over a year ago

What does "you lose the closure the function was in" mean?

Community · Accepted Answer · 2017-05-23 11:44:30Z

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You can use command line editor to execute arbitrary JS. Here is a previous post on this: How to edit JavaScript in Firebug?

More on js console: http://getfirebug.com/commandline

The other thing you can do is set a break point and change a variable on the fly.

edited May 23, 2017 at 11:44

CommunityBot

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answered Jan 25, 2012 at 6:05

dbrin

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3 Comments

Virendra Over a year ago

so , can it be possible to change the variable's value like this ? 'coz i also want to do such types of changes , if major changes couldn't be done .

dbrin Over a year ago

absolutely you can. you can also execute any arbitrary javascript via command line in firebug.

Virendra Over a year ago

but i am interested in Last line . how can we change the value at time of debugging . Is it the same by executing the code at console ? or is there any other ways to do .

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