HTML5 adds type="tel" to, but it is not widely supported. Similarly, we can use required on to specify input value cannot be an empty string.įor radio buttons, it is sufficient to place an required on one of the buttons. The oninvalid and oninput event handlers are used to customize the error message. The attribute pattern="regex" specifies an regular expression (regex) pattern to be validated for this field. The attribute placeholder="text" is used to show hints on the text field as watermark. The attribute autofocus sets the focus to this element. The attribute required specifies that input cannot be empty. Using HTML5 HTML " H5FormValidation.html" On the other hand, there are also tons of advanced Form Input Validator libraries, such as Parsley JS. You should use HTML5 for input validation, which is much simpler and stable (Read " HTML Form By Examples"). NOTE: HTML5 supports form input validation. More examples on jQuery + HTML5/CSS3 HTML Form Input Validation The now-preferred approach is not to embed styles and JavaScript codes inside HTML document, but keep them in separate files. js", for ease of maintenance and good software engineering practice. It is a good practice to separate the HTML contents, CSS presentation styles and JavaScript behavior programming codes in three different files, ".
One misspell character in variable or function name, may waste a lot of your time, as JavaScript treat it as a new item or abort the function. It is very difficult to debug JavaScript codes due to its loose syntax. At a minimum, you should have the "Firebug" (or Web Developer Tools).
Read " Writing and Debugging JavaScripts", before trying out these examples.
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