Validating a textbox in javascript

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Here we create a Reg Exp pattern and use the match to validate it.When filling forms, you may have seen there are some required fields to fill before you submit the form.So the condition is we check whether the textbox contains anything ELSE other than numbers and display a message As you can see the function validate() checks if the entered string contains characters that does NOT (notice the ^ symbol) match the numbers 0 to 9 including white spaces and special characters.From numbers we’ll move to alphabets first an example for validation lowercase alphabets and then to validate both uppercase and lowercase.That means if you type incorrect value for the age field, it alerts you to enter a correct value for age. There user have to enter at least 20 characters to the description field.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.

In most cases when you prompt for age as an input you can set maxlength to 2.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.You can do these validation events such as onclick, mouse over, on change, etc.This code sample shows you how to validate textfield at the onsubmit event of the form.

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