Accordingly, we’re going to reveal several tips regarding the Console.
Opening the Console
To open the Console as a panel - press on
J (Windows/Linux) or
To open the Console as a drawer - press on
Selecting an Elements
We can execute
querySelectorAll for selecting all elements by a selector using
Note: If we want to execute
querySelector, we should use
Last Evaluated Expression
To access the last evaluated expression, we can use
Note: We can apply the appropriate methods on that expression, for instance - if it’s a DOM element, we’re able to invoke
innerHTML and print the result into the Console.
Last Five Elements
In case that we traverse the DOM manually, we’ve the ability to access the last five watched elements. In order to do that, we can use the commands:
$0 returns the current selected element whereas
$4 return the last historical elements respectively:
Copy to Clipboard
Sometimes we need to copy the string representation of an object to the clipboard:
Note: In previous versions of DevTools, we should have used
copy(JSON.stringify(object)) in order to convert the JSON to a string. However, it isn’t needed anymore.
Registered Event Listeners
Printing the registered event listeners for an object is pretty easy because of
Note: Assuming there is a button with click event in the page.
Monitoring a Function
We can track invocations for a function with the passed arguments using
Note: To stop the tracking - use
Monitoring an Events
We can track an events of an object using
monitorEvents(object, [events]). The first argument is the actual specified object whereas the second is the specified array of events (or a single event).
Let’s listen and simulate clicks on the
A few points:
- To stop the tracking - use
- We could use
unmonitorEvents(object)to eliminate the tracking for all events.
Measuring time for a dedicated action could be performed simply when invoking
console.time(text) before the action and
Styling Console Output
Applying CSS on the output text is performed using the
%c string, which indicates the beginning of the styled text. The second parameter is a string of the specified CSS properties.
Here’s an example:
Hiding Network Messages
Network messages may appear in the Console in case of an error of a resource, blocking scripts and so on. From time to time, we don’t care about these messages and we wish to hide them:
Editing an Element
We can edit the content of an element directly through the Console:
Note: The element could be edited as HTML as well.
Check out the following links for more information: