An onload
handler allows JavaScript code to be executed when an HTML page has completed loading. While adding an onload
handler to a Visualforce page, care must be taken not to interfere with any default onload
handler added by the platform, to give focus to the first input field in the page, for example.
In this recipe we will create a Visualforce page that allows a user to create an opportunity. An onload
handler in the page executes a JavaScript function to set the default value for the opportunity amount
field to 100000
. If the platform has specified an onload
handler function, this is executed before the amount
value is set.
This recipe makes use of a standard controller, so we only need to create the Visualforce page.
Create the Visualforce page by navigating to the Visualforce setup page by clicking on Your Name | Setup | Develop | Pages.
Click on the New button.
Enter
Onload
in the Label field.Accept the default Onload that is automatically generated for...