Chrome Dev Tools - Can you undo changes in the console? - javascript

If you enter a command in Chrome Dev tools (which could be one big block of code) and hit enter, is there a way to "undo" changes made to the DOM? Or do you simply have to refresh the page?

I too was looking for an answer to this question beyond "refresh the page"... Stumbled across this solution:
Enter Chrome dev tools (CMD + Shift + I on Mac)
Click the three dots aligned vertically to get the settings menu
Hover over "More Tools" then go to "Changes"
On the changes window you can see all the changes made during your current DOM editing session - to revert them all, simply click the
undo arrow in the bottom left...
See the visual below
Reset all changes made in Chrome dev tools

Depends on what that code actually does. For example if you change something in the style (css) or structure (html), if you refresh it will show the original page. But if that code changes a cookie value, refreshing is not enough, or even closing the browser and opening again.

Related

Developer Tools in Google Chrome not showing

I'm just moved to windows 10.
And have latest version of Google Chrome on it.
But whenever I tried to access developer’s tool it shows nothing.
I have tried,
1) Right Click + Inspect element.
2) F12.
3) Right corner tab on Google chrome + more tools + developers tool.
But none of them working.
Please help.....
I don't know what is missing.
I had the same issue but in my scenario I was on a Virtual Machine with some complex display settings. The procedure here worked for me in other contexts:
You should see the process in the Windows bar on the bottom of your screen.
When you click on it, nothing is shown.
Bring back in the viewport
If the conditions above apply, then the window is simply displayed out of the display viewport. TO bring it back, do the following:
Make sure you have selected the window in the Windows bar.
Hit ALT + SPACE to show the menu
Select "Maximize".
The window should appear in one of your monitors.
Drag it around and resize it.
You should try also Ctrl+Shift+I for windows as written on the following doc
https://developers.google.com/web/tools/chrome-devtools/
I fixed this of this way
Open chrome dev tools
using the chrome page that you need debug press Win + "<" (left arrow)
windows ask you which window you want to the right and select chrome dev tool icon, but click should be in the icon instead of the rectangle of the windows
Just had the same problem. The window is apparently minimized.
On windows, hold the mouse on the chrome icon in the taskbar, when the thumb shows up, right click on it and select maximize window.
First thing i would try is closing all processes and restarting Chrome and if that doesn't work i would uninstall and reinstall chrome
I know this isn't really an answer but hope it might help
Goodluck!
Chrome -> Setting -> Extensions (Side Menu) -> Turn on Developer Mode
Had the same issue, The thing is just minimized. Hover over the side of the options at the bottom and drag to top and you will see the options.
see following image and hover over ht area highlighted in yellow
Your dev-tool might be on your second monitor, which you are not looking at but connect with your PC.
Disclaimer: Please try this at your own risk, I'm not fully aware of its consequences. It apparently clears chrome's local storage for all websites
All the solutions I saw didn't work for me, but this one did:
I deleted this folder:
// AppData\Local\Google\Chrome\User Data\Default\Local Storage\leveldb

View elements tab and sources tab at the same time in chrome dev tools [duplicate]

I want to debug code at the same time as I see what is being sent on the network tab without having to go back and forth between the Network tab and Sources tab. Is there a way to do this as of chrome Version 52.0.2743.82 or Version 54.0.2810.2 canary?
I know that it is possible to log http request in the console which can be visible with other tabs open but I want the actuall networks tab if possible..
Thank you in advance
This is now possible in Chrome 87. Right click Network in the menu and select "Move to bottom"
and it will do this
You can view 'Quick source' while viewing the Network panel (or the other main panels) at the same. This will allow you to view the source and add breakpoints.
However, it's not possible to step through code using the debugging in the split view. Chrome will automatically switch to the Sources tab if you use the shortcuts.
It's also not possible to have an extension running a separate instance of the debugger as the Chrome Debugging Protocol doesn't allow simultaneous clients to be connected.
I will open up a discussion with other Chromium contributors into the feasibility of sharing the debugging controls in the split view. I don't know whether it will or can be done easily. I suspect it's a fair amount of work.
If you would like to set up the split view, as it's useful anyway, go to overflow menu on the right side and select 'More Tools' and then select 'Show console'. This makes sure the panel loads below the main one.
On the left side of the panel that shows, click the overflow menu and select 'Quick source'.
You will now see a small Sources panel.
Since I was referred here from this question, I'll answer here.
In my scenario I need to be able to work on two different source files (under DevTools->Sources) simultaneously, for instance an html and a css file.
My workaround was to work on two separate tabs.
Right click one of them and click 'Open in new tab'.
When the new tab is open press F12 to open DevTools, and dock the two editors side by side (Focus on one and pressing ⊞+→ then leftwards on the other one).
Result:

How to disable JavaScript in Chrome Developer Tools?

I am trying to debug the features of a website when users disable their JavaScript. I was wondering how do you disable JavaScript for a page from the Google Chrome DevTools?
Click the gear icon in the corner of the Developer Tools, click Settings, then under Debugger, check Disable Javascript, as shown in the following video:
Update August 2020
Developer Tools (F12)
Click the Gear icon
Should open the Preference tab
Disable Javascript option is on the far right
Original answer
Developer Tools (F12)
Three vertical dots in upper right
Settings
Under the "Preferences" tab on the left
There will be a "Debugger" section with the option (probably on far right)
Official documentation: Disable JavaScript With Chrome DevTools
There's now a command menu built into DevTools that makes it easier to disable JavaScript. This has been around as of April 2016 or so.
Open DevTools.
Press Command+Shift+P (Mac) or Control+Shift+P (Windows, Linux) to open the Command Menu. Make sure that your cursor's focus is on the DevTools window, not your browser viewport.
Type Disable JavaScript (or some version of that... it's a fuzzy search) and then press Enter.
Use the Enable JavaScript command when you want to turn it back on.
chrome://settings/content Javascript/Manage Exceptions
This extension makes it faster (I am the author) : Quick Javascript Switcher
It is open source: https://github.com/maximelebreton/quick-javascript-switcher
You can also run Chrome with JavaScript disabled by default by using the flag:
-disable-javascript
You would use this for example by running Chrome like this:
C:\Documents and Settings\%username%\Local Settings\Application Data\Google\Chrome" -disable-javascript
The quickest way is problably this one:
F12 to open the dev console
ctrl + shift + p to open the command tool (windows)
Type 'disable javascript' and hit enter
On OSX, I had to click the triple vertical dots, and uncheck a box in the settings section. Which can also be opened with f1
Using only the keyboard at least for Windows 10:
F12, shows Developer Tools
F1, shows Settings
tab, moves to the "Disable Javascript" check box
space, toggles the option
esc, hides Settings
The fast way:
1) just click on CTRL + SHIFT + P
2) fill the field by the 3 letters dis and will appear this box and select the item Disable Javascript
.
that's all folks!
On Mac OS X:
Preferences
Show advanced settings
Press the "content settings" button
Scroll to the "JavaScript" section
Check the checkbox in front of "Do not allow any site to run JavaScript"
The Chrome Quick JavaScript Switcher extension is a lot easier though :-)
Go to options (Windows: three vertical dots in the top right) -> Settings, or hit F1.
In the General section you find "disable JavaScript"
The gear icon is no longer part of developer tools. Since Chome 30.0 it is not even possible to bring it back (In Google Chrome Developer Tools, the toolbar icons disappeared. What gives?)
To temporarily block JavaScript on a domain :
Click on the Button left to the address on the address bar (which says View site information)
In the drop-down next to JavaScript, select Always block on this site
Reload Page
Click the ⋮ menu in the corner of the Developer Tools, click Settings
Click on Advanced at the bottom
Click on Content Settings
Click on JavaScript
Switch off
Full and fast instructions for Chrome browsers (Opera incl.)
The first way
If Developer Tools aren't open then press F12 key on keyboard to show the Developer Tools. In Opera browser you have to use key combination Ctrl + Shift + i on keyboard to open it.
To show the settings just press F1 key on keyboard. The Developer Tools window must be focused when you are doing it. Or if you want to open the settings with the mouse then you have to click on ⋮ button in the top right corner of the Developer Tools, then click Settings in the menu.
Then you have to scroll down the settings window to bottom and then you will see the checkbox for disabling JavaScript like follows:
Just click on this checkbox and push esc key on keyboard for hide the settings. If you want to enable it then you have to do the same way again.
The second way
If Developer Tools aren't open then open it like in the first way is described.
Press the key combination Ctrl + Shift + P (for Windows or Linux) or Cmd (⌘) + Shift + P (for Mac) to open the Command Menu. Be sure that the focus is on the DevTools window.
Type there "Disable JavaScript" and then press Enter or click it with the mouse. If you want to turn back the enanled JS then open the Command Menu again and type there "Enable JavaScript" and then press Enter or click it with the mouse. You could also write just only "JavaScript" or "Java" there and then choose it with the mouse.
If all this does not work
For some reason it is possible that it does not work. I this case open a new empty site in "Incognito Mode" and do all this there.
The quickest way
In Chrome Web Store or on Opera Addon site you can find and install extensions which do it per one click. Just search "Javascript Switcher":
For Chrome browser
For Opera browser
Press F8 for temporarily freezing / unfreezing JS (with DevTools open).
This is very useful for debugging UI issues on elements that may lose focus if you click or press anything outside of that element. (Chrome 71.0.3578.98, Ubuntu 18.10)
Paste it: chrome://settings/content
Go to "Javascript" section and disable it.
Chrome://chrome/settings/Privacy/Content settings/JavaScript
and there you can PASTE your website's URL in Manage exceptions.. and change the JavaScript priority from ALLOW to BLOCK.
This is the latest setting for the windows
Settings > Advanced > Privacy and security > Site Settings > Javascript > Blocked then get switch on and off
good question, i try so many way, but it is curry and boring, until i find shortcut.
alt + cmd + i, this open dev tools, unless you use pocket, that need set other shortcut.
shift + cmd + p, then input: javascript
only two shortcut, but i think safari is more convenient for that.
There's a settings in chrome
open the menu from chrome,
click settings > type in "javascript" in the search bar > click site settings > click javascript.
from here you can toggle javascript specifically to a site using their url.
or just click the big button to allow/block it to all sites.
I arrived here simply wanting to know how to disable javascript in chrome:
Right click on the website
Click "inspect"
Hit keys: ctrl + shift + p
Type: "Java"
Click "disable JavaScript"
Refresh page
It's from here

Chrome devtools: Drop into debugger without switching to Sources tab

If I put the debugger statement in my JavaScript source with the Chrome devtools open, it'll stop execution so I can interactively explore the current context from the console. It's really awesome.
But unfortunately it will also switch to the Sources tab and display the line where the debugger statement happened. Most of the time, I want to type JavaScript commands, so I have to manually switch back to the Console tab.
Can I avoid the tab-switching and stay in the Console tab?
Or am I using it wrong?
Right-click on the source-tab and select 'move to bottom'.
Looks like Chrome added a preference for this in the intervening 9 years: https://stackoverflow.com/a/69216922/66673
Quoting that answer:
I had the same issue and it was driving me nuts! The way I managed it to stop switching was to go to into the DevTools settings -> Preferences.
Under Sources options, uncheck Focus Sources panel when triggering a breakpoint.
There's a reason for that - and is that whenever the code has stopped, because of a breakpoint or a debugger statement, you'd usually want to actually see where the execution has stopped. So, the developer tools switches to the Scripts/Sources tab, and this is a common behaviour among the major browsers, that may also show the local variables, the call stack and so on.
The best thing you can do is to keep the console frame always open, so you're ready to work. Just press Esc or click on the second icon on the lower left corner. That's what I usually do.
Switch to the Console tab when you expect to get a large response from the command you type.

tracing code execution across HTML, CSS and Javascript

Is there anyway that I could trace/see the exact order that a website is processed across html, css and javascript?
I have a function that is not firing off on the first pass and I'm pretty sure it has to do with the order of execution.
but also, it would be very informative to see the individual steps as they are processed (slowly)
Thanks for any advice.
this is in relation to this question:
flashMovie.Play is not a function
It sounds as if you want to set up breakpoints in your code, and then step through the execution path.
Click on the Wrench symbol on the top right of the Chrome screen, select Tools, and select Developer Tools
Click on the Scripts tab on the bottom pane of the Chrome Screen
Click on Folders on the top left corner of the bottom pane of the Chrome Screen
Click on the script that you want to debug
Click on the line that want to setup the breakpoint
The Chrome Developer Tools official documentation is also available here: https://developers.google.com/chrome-developer-tools/docs/scripts
Once you have hit the desired breakpoint (which could just be the first line of the script), the click on the "Step into next function call" (it looks like a down arrow pointing to a dot) button on the top right section of the bottom pane of the Chrome screen.
These questions should help as well:
How to step through code in Google chrome javascript debugger
How to set breakpoints in inline Javascript in Google Chrome?
Javascript breakpoints not working in Chrome Developer Tools
Set a breakpoint in XHR in Chrome
In Chrome, use the Developer Tool Bar. Press the Keyboard Key: F12.
Place an alert(1); or console.log(2) in your JS and see what happens. If you use Firefox start with opening its web console and look if you get any errors there. Ctrl+Shift-K to open the Web Console.
Press F12 OR Ctrl+Shift-K for developer tools, it works almost in any browser. you will be debug your code and use consol

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