change NewForm2 behaviour

Hi,

According to your description, you might want to run some JavaScript when clicking the OK or Cancel button in the NewForm page.

Yes, there is a built-in function PreSaveAction() which will handle the event when user submit a new item to the database, you can add your custom JavaScript there.

Two links below with code demos would provide more information about PreSaveAction():

http://sharepointwings.blogspot.com/2012/06/javascript-presaveaction-in-sharepoint.html

http://www.ilikesharepoint.de/2014/06/sharepoint-presaveaction-helps-for-actions-before-saving-an-item/

Or you can provide more details about what you are going to achieve, maybe we can see if there any existing solution already.

Best regards,

Patrick

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Patrick Liang

TechNet Community Support