Validating when the user submits the form

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If it has not been submitted, skip the validation and display a blank form.However, in the example above, all input fields are optional.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.

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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.That could be done using Ajax, but would make the CAPTCHA much easier to break.Very handy, everything else I found was rubbish but this gave me exactly what I wanted with minor modification (removed ' ' character) - needed to alert user if 'username' contained a space /anywhere/ in the field. tags: Javascript field validation no spaces alert Hi - Is it possible to have a checkbox, that has a default of checked, so that the user HAS to enter info into the textarea.The value of a text input box (or a textarea or password input) is available using the syntax that tells you which option has been selected.The illustration below shows this relationship: Note that the 'I' in selected Index needs to be capitalised - Java Script functions and variables are always case-sensitive. Read more about the humble checkbox in our HTML5 Checkbox Validation article.

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