I wish to populate message on click of save button when we are uploading documents to document library.
I need to do something with
editForm.aspx page but I'm not able to reach there.
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EditForm.aspx and put the below code inside a Script editor web part.
My suggest is that you should put your code in text file & load it to Script Editor webpart
Note:- This is the sample code, If your title is blank and you click on the Save button then it will show the alert.