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I'm trying to write javascript code that affects the breakpoints in debugging mode in Chrome console.
something like:
function someJavascriptCode() {
console.log('will stop here for debugging');
debugger; // stop!
chrome.debugger.stepOver(); // just like clicking F10 in the console when in a breakpoint
console.log('This line just happened because of the previous line');
}
Any ideas?
Nothing like that is implemented, nor is it likely to be in that manner because it doesn't make any sense to have functions to control the debugger in runtime code. It could possibly be done with some kind of directive, but I doubt anything like that exists and I can't really think of any genuine use cases.
If you're looking to do this externally, you might want to take a look at the remote debugging protocol or writing a debugger extension.
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I have understood for java code coverage tools like jacoco. but i see that there are a lot of javascript code coverage tools available. I am just getting curious, that how do they work internally and give us the percentage report.
As far as I know, these tools add extra code to our inspected files to count function and line hits. These tools store this hits in a map, where you could find the file and functions related to each line.
After that is pretty easy to calculate the coverage of each file/function.
I just found this information here, Istanbul is an example of code coverage tooling in JS. There's a lot more!
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I've seen a lot of posts with this question. But apparently, they're all outdated. There's any chance to disable that execution nowadays?
EDIT: Chrome Console, I'm trying to deny any javascript execution that any user writes on the console.
Per your comment:
I'm trying to deny any javascript execution that any user writes on the console
This request is impossible. Users can execute whatever JavaScript they would like. They can also choose to disable any or all of your JavaScript.
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Does anyone if/how to many JS errors affect the server? Does it affect page render?
I have different errors in different sites (and I will fix them) but does it affect anything?
Here is an example:
The javascript errors most likely won't affect the server, since Javascript is executed on client side.
When it comes to page render, javascript errors might break your page. Let's get for example angular single application, if there is javascript error, you're most likely to see nothing at all.
Errors such as undefined is not a function might be sign for passing value instead of callback. For example:
$.ajax("url.php", 32); // the second parameter must be callback/function
You must review your code and fix them, because these errors are clear sign that something in your application is not working.
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Sometimes it occurs that I like a feature on an page and want to read its javascript,
but it is an difficult task to manually find where the function is especially when the webpages more than one js files.
Is there a way I can get/copy the only required js file by its name which I can easily get by inspecting page.
examole:
<div id='abc()'></div>
Now how to fine the source of function div()?
The simplest solution for a function which is defined in the global scope :
open the console of your browser (F12 in most browsers)
type the name of the function
For example type klass in the console on this page.
In the general case, you really need to learn to use the console, including the debugger.
Regarding your practical question : what changes the background of the http://www.noisli.com/ page :
it's not the changebackground function : this function doesn't exist
it's in the first line of jplayer.js
But the way I found it is too hacky, I hacked the Math.random function by typing this in the console :
Math.random = function(){ debugger; return Math.random() }
so that I would enter in debug and see the call stack...
I hope somebody can propose a clean way.
If you can execute boormakrlets in your address-bar, you could do:
javascript:abc.toString()
Or better:
javascript:alert(abc.toString())
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I know you cannot disable the tools without changing the registry but is it illegal to block the user from hitting F12 or inhibiting them from accessing developer tools at all?
I ask this because there is a discussion going on about web accessibility and I'm trying to find proof that you should not do this. Please advise and thanks in advance.
Assuming this is IE, and the user is in a corporate environment where she is on a crippled desktop and does not have the right/permission to install other programs like Firefox, Chrome then my answer is "No, it's not illegal."
The computer belongs to the employer and he decides who does what, assuming the user is expected to fulfill a very specific well-defined job.