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call Javascript via Apex Class

 Visualforce Page:

escape - This attribute which allows the HTML Tags and Javascripts. if we make escape = true, the character escape sequence displays as written.


Apex Class

Below is the screen shot for classes, where will have the string variable and calling the javascript on that variable.

 

Output:

when you execute the above code, the below alert box will appear.

Add Visualforce page in Message and Alert Section of the Home Page.

Step 1:
Create a Visualforce Page.

Step 2: In the Home Page Components, click edit on Message and Alert Section

Enter the below code in that section.

Output: