Validating form input javascript Free one to one strip cam

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.But if the user unchecks the box, the user DOESNT have to enter info in textarea. Following pictorial shows in which field, what validation we want to impose.We will create Java Script functions (one for each input field whose value is to validate) which check whether a value submitted by user passes the validation.This is done using HTML5 form validation techniques and CSS, but it only validates the input format (pattern) and not the actual values.

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

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.

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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