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Validating a textbox

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The dovalidate()for textbox is below: It is possible to modify this to check for numbers in particular ranges using additional code.NOTE: Comment Box question types cannot be validated.Finally, you'll validate all the data when user submitting the form.You can validate at the time a user is writting by listening to the events of onkeyup and onkeydown.After reading this article you’ll be able to do advanced javascript validation using regular expressions a.k.a.Reg Exp for basic javascript validation read Javascript Validation – Textbox Combobox Radiobutton Checkbox.

The onclick event handler in the fake button on line 61 is the function dovalidate().

The validation functionality uses Javascript code to present an alert to users who have typed in invalid input.

Two examples are provided: email address validation and number validation. That is, the form will not be submitted until and unless the user provides valid data for both items.

When the user clicks on the Continue button, dovalidate() checks if the user has provided valid input.

If the input is invalid then the user is alerted; else the form is submitted using document.form1.submit().