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print_r equivalent

Posted on 2013-12-15
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Last Modified: 2013-12-31
Is it possible to dump a variable to the console, or alert box without just debugging?

Im trying to debug a JavaScript, but cant find out where it is executing. What I would like to do is something that I would usually do in PHP by print_r($myValirable);
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Question by:tonelm54
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COBOLdinosaur earned 500 total points
ID: 39720546
alert (myvariable);

Will either return a value, tell you it is an object, or tell you it is undefined.  Will that solve you problem?

If you need the properties of an object you can use: getOwnPropertyNames()
The use of getOwnPropertyNames() is definitively described here:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames

Cd&
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by:Alexandre Simões
ID: 39720920
Pint to console is usually less obtrusive:
console.log(myvalue);

this will print whatever you want to the debugging console. (Hit F12 in any major browser)

Otherwise I like to use FireFox (with FireBug) for this.
1. I just run the website and hit F12.
2. Select FireBug's Script tab
    Now you have 2 options
    2.1. Search for the line you want and it will go through all scripts (file and in-line) to find it
    2.2. Select the file directly from the scripts list
    (I prefer the first)

3. Put a breakpoint in the line you want to inspect
4. Refresh the site


The execution will stop on the breakpoint and from there you can use the Stack tab (on the right inside the Script tab) to see the full call stack.


Btw, this is also possible in Chrome and maybe not as easy but also in IE.
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