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This article mainly introduces the JavaScript form verification case analysis of the relevant knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that everyone after reading this JavaScript form verification case analysis article will have a harvest, let's take a look at it.

JavaScript can be used to validate the input data in the HTML form before it is sent to the server.

Form data often needs to use JavaScript to verify its correctness:

Verify that the form data is empty?

Verify that the input is a correct email address?

Verify that the date is entered correctly?

Verify that the form input is numeric?

Required (or required) items

The following function is used to check whether the user has filled in the required (or required) items in the form. If the required or required option is empty, the warning box pops up and the return value of the function is false, otherwise the return value of the function is true (meaning there is no problem with the data):

Function validateForm ()

{

Var x=document.forms ["myForm"] ["fname"] .value

If (x==null | | Xerox = "")

{

Alert ("last name must be filled in")

Return false

}

}

The above functions are called when the form form is submitted:

Case study

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