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In this article Xiaobian for you to introduce in detail "JavaScript form verification how to complete", detailed content, clear steps, details handled properly, I hope that this "JavaScript form verification how to complete" article can help you solve doubts, following the editor's ideas slowly in-depth, together to learn new knowledge.

HTML form validation can be done through JavaScript.

The following example code is used to determine whether the form field (fname) value exists, and if not, pop-up information to prevent form submission:

JavaScript instance

Function validateForm () {

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

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

Alert ("A name is required.")

Return false

}

}

The above JavaScript code can be called through HTML code:

HTML form instance

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