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JavaScript code to be run prior to the submission of the form.
Default value
Blank. No JavaScript is run.
Valid values
Any valid JavaScript function, or JavaScript code followed by a semicolon
...
(;
...
).
If you want to execute the presubmit JavaScript only, without running the JavaScript that submits the request (thus canceling the onclick event), append return false; to your presubmit JavaScript.
Example
The following example shows a message box:
The following example shows a message box and cancels the submit JavaScript:
