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OnChange event on textbox only fires once

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Posted on by lras1202

Hello,

I have a case number textbox and need to check if the case number is already exist in SharePoint list. So I used OnChange. It works the first time. If you come back to the textbox and type the same case number, OnChange wont fire anymore. Anyone has seen this behavior?

Thanks for your help.

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timl 36,634 Super User 2026 Season 1 on at

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Hi @lras1202

This is the expected behaviour of the OnChange event, because if you re-type the exact same case number into the text box, the value hasn't actually changed.

Could you maybe clarify why this causes you a problem? If you check whether the case number exists when OnChange first executes and if the user re-enters the same case number, that number will already have been checked?

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lras1202 52 on at

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Hi @timl
The user did get the waring message when he typed in the same case number. Then he went back to the case number field and re-typed the same case number, and it didn't give him the warning message anymore. So I put another check on Submit, if there is a duplicate case number, it won't get submitted. So if the user goes back to put in the same case number, nothing stops him submitting the duplicate case.

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