Standard tables validating data fields

Using a single table, we need to determine how many rows are used in each column, to define the range that we want to present in our Data Validation list.Even if you have inserted the underscore in the table name, but leave the space in the header, Excel will not return the range just using the text of the header.Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format that we need to process it successfully, and that it won't break our applications.We also want to help our users to fill out our forms correctly and not get frustrated when trying to use our apps.

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More and more browsers now support the constraint validation API, and it's becoming reliable.In this example, I have started at A1 of the data entry sheet, it could start anywhere on the sheet but you would need to adjust the formulas which I will show shortly to account for this.When we have a Data Validation list, we want it to only show the list of valid entries, and not show any blank rows.The truth is that none of us filling out forms — there is a lot of evidence to show that users get annoyed by forms, and it will cause them to leave and go somewhere else if they are done poorly. We want to make filling out web forms as painless as possible.

So why do we insist on blocking our users at every turn?

This is done by using validation attributes on form elements, which allow you to specify rules for a form input like whether a value needs to be filled in, the minimum and maximum length of the data, whether it needs to be a number, an email address, or something else, and a pattern that it must match.