Javascript code for validating textbox

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Hi all, i am working on asp.net, for example in a form they are 10 text boxes i want to validate each textbox if it is empty it should display a alert message.

It assumes that all textareas on your form must be non-blank but you could easily change that if needed.

This would apply an error css class to highlight your required fields and display an appropriate message to the user.

It’s not even full client-side validation – it’s just a subtle usability enhancement, implemented in an accessible way, which (as I discovered while testing the script) is almost identical to something that Firefox now does natively!

In recent versions of Firefox, if a then the field will show a red outline, as illustrated by the following figure. If it did, then every required field would have that outline by default.

Once that scripting is implemented, we’re actually only a couple of skips and hops away from a complete polyfill.

Such a script is beyond the scope of this article, but if you wanted to develop it further, all of the basic blocks are there – testing whether a field should be validated, validating a field against a pattern and/or required, and binding trigger events.

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If the data entered by a client was incorrect or was simply missing, the server would have to send all the data back to the client and request that the form be resubmitted with correct information.

However, if you prefer a j Query solution you could try something like this.

var validate Text Areas = function() You would call this method during your form validation.

This is very poor usability, and directly contravenes accessibility guidelines.

What we’re going to do in this article is far less intrusive.

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