Validating Form Data To Not Accept Null Values

Jul 24, 2014

I'm building a form comprising some text boxes and drop down lists. I'd like for data (once input into the form by the user) to input, upon click of a submit button, into an excel spreadsheet, row by row.

Here's where i'm struggling: I need the form to validate data before submitting. Namley, the form must not allow null values to be submitted and will show a message box telling the user what is needed.

Below is what i've got so far. I've tried playing around with this but am struggling to implement the above functionality:

[Code] ..........

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[Code] ......

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[Code] .......

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