I have a html which has an input box. I want to use the keyboard to enter some text in the input box and in the debugger I want to see input box's value.
but when I run the debugger with "ctrl+r" , the web page become inactive, so I can't enter.
how can I do that?
To debug, you need to use browser Console window.
To activate console window in chrome, here are few options
Press F12
Right click on your page and choose Inspect option
Press ctrl + shift + i
You will get a develper window, Here choose the console tab.
Once you are here you can write your Javscript/ Jquery (if library is loaded) and debug the values.
To debug Functions or event handlers
Add this keyword debugger; in any line from where you want to debug, Then open up the developer window and then do the activity which will trigger the function execution, The Sources window will stop right at the line where it hits debugger; and from there you can use F10,F11 etc keys to debug.
Look for these options
ctrl + r is for refresh the page , not the debugger.
for debug you need to do one from two options:
1) insert in your code "debbuger;" in the line that you want to stop there
2) put a break point using the chrome developer tools
attach for you link that will help you with all that :
https://developers.google.com/web/tools/chrome-devtools/?utm_source=dcc&utm_medium=redirect&utm_campaign=2016q3
While debugging a web page in Chrome, my finger slipped and I pressed a combination of something (around the F12 key) on the keyboard. I got this screen:
Which is incredibly handy for developing mobile pages and actually something I've been looking for. Now I can't figure out how I got this.
So, how do I get back to this screen.
That's the emulation screen, press F12 then click on the mobile in the top left corner.
Simple, press F12 to open up the developer console.
Then, to show the device choice options:
Ctrl + Shift + M in Windows/Linux
Cmd + Shift + M in Mac
To show the ruler, go to:
Under Settings > General > Show rulers a ruler can be enabled which
will be displayed when you hover over or select an element in the
Elements panel.
All keyboard shortcuts for Chrome can be found here:
https://developer.chrome.com/devtools/docs/shortcuts
I want to debug javascript and see a console at the same time (something like having two separate windows). I can not find a way to do this: either a debugger or a console.
Yes. There is an button that looks like >= in the top right of the developer tools
When you click on that it opens a drawer that allows you to run console commands
Update for 2017
The icon has been removed and is now available through the dropdown menu (which also helpfully shows the keyboard shortcut: Esc)
Press escape while in the debugger to open the console.
You may also open up the console to experiment while paused. Hit the [Esc] key to bring the console into view.
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
I am using a gwt based ui design framework (called GXT). In the docs for this framework, it is mentioned that running "javascript:isc.showConsole()" when the app is running, will open the developer console in browser.
However when I run this in Chrome it instead does a google search for the command- in firefox it simply does not work.
How do I execute this javascript in firefox or chrome--
javascript:isc.showConsole()
Bookmarklets cannot be executed in the location bar/omnibox any more.
You have to bookmark the javascript: link before it can be executed.
A better solution is using the built-in Developer tools, in which code can be pasted and executed in the current page:
Firefox: Ctrl Shift K - See Using the web console.
Chrome: Ctrl Shift J - See Developer tools.
In Chrome, you add a tab, open bookmarks - click Other Bookmarks, right click in the bookmarks area, click add new page - and paste the URL.
In Firefox, just manage your bookmarks, click on the folder, right click in the bookmarks section and click New Bookmark.
You have to put the command in the URL of the very SmartGWT
application that you're developing, not any blank page.
Making it become a bookmark bar is a good idea, click that bookmark
when you're opening the application will open the console for you.