The problem is that, to have the data submitted in a 'nice' format to the server, the function returns an array containing all the selected checkbox values. Again, we can make the code a lot simpler in supporting browsers: suffix tells a server side script such as PHP to accept multiple values with that name into an array.Normally you would modify this so that you could submit or not submit the form based on the number of items selected. Note that in this section we've been using the new ES6 syntax which may not be available in all browsers.The purpose of a form validation script is to return a boolean value ( to reference form fields, but that can lead to namespace conflicts and why make things more complicated than necessary.When the form is submitted - either by hitting Enter or clicking on the Submit button - the to abort (cancel) the form submission. In a real-life situation you will most likely have more fields to check, and more complicated conditions, but the principle remains the same.Please share if you have any idea how to a accomplish this Hello, I need assistance regarding client side validation using Java Script.Validating form input with Java Script is easy to do and can save a lot of unnecessary calls to the server.
If you're working with arrays of checkboxes to submit data to a server-side script then you might already have some grey hairs from trying to figure out how to validate the input using Java Script.In more complicated forms you will want to set conditions on the form that combine multiple elements.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.Otherwise a browser with Java Script disabled, or a hacker trying to compromise your site, can easily by-pass client-side validation.For an alternative approach to client-side form validation, without Java Script, check out our new article on HTML5 Form Validation which is available now in most modern browsers. The first test in the example is therefore only necessary in order to provide a different error message when the input is blank.
It explains some of the code examples above as well as introducing more advanced concepts: We would be remiss in not pointing out that your Java Script and HTML code should be kept separated as far as possible. 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.