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Posted by / 15-Apr-2020 01:38

Java script validating form

When the form is submitted - either by hitting Enter or clicking on the Submit button - the (the 'value' of the field called 'input' belonging to the form). In a real-life situation you will most likely have more fields to check, and more complicated conditions, but the principle remains the same.

Other form values are available using a similar syntax, although this becomes more complicated if you're using SELECT lists, checkboxes or radio buttons (see below for examples). All you need to do is extend the command is encountered, execution of the function is halted.

Validating form input with Java Script is easy to do and can save a lot of unnecessary calls to the server as all processing is handled by the web browser.

It can prevent people from leaving fields blank, from entering too little or too much or from using invalid characters.

In other words if the first condition fails, the second condition will not be tested and so forth.

Only when all conditions have been satisfied do we reach the command, in which case the form will be submitted.

In this example, we are going to validate the name and password.

The name can’t be empty and password can’t be less than 6 characters long. The user will not be forwarded to the next page until given values are correct.

Through Java Script, we can validate name, password, email, date, mobile number etc fields.

This is done using HTML5 form validation techniques and CSS, but it only validates the input format (pattern) and not the actual values.

That could be done using Ajax, but would make the CAPTCHA much easier to break.

Normally you would modify this so that you could submit or not submit the form based on the number of items selected. For example, a text input that only needs to have a value if a checkbox is checked: Using simple logical operators and the functions supplied above you can do all sorts of client-side form validation.

To take things a step further you can even explore Ajax Form Validation which lets you supply real-time feedback using server-side scripts triggered by Java Script events.

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I've coded a working form, all checks are great but for some reason the hardest part is trying to stop form submission before validation.