Validating a checkbox in javascript 4cam xxx

If a textbox is empty or an option is not selected we can use javascript to display an alert message, and highlight the empty field and also we should make sure the page stays the same and doesn’t get “submitted” Javascript validation is a client side validation and relies on the web browser so it should not be solely relied upon Textbox is the simplest element to validate if empty or not.

We need to check if it is equal to null or “” because different browsers act differently so its better to check for both the conditions.

When I copied and pasted your code into a html file and ran it, my FF and IE spat out an error.

If you put an alert() inside and just below your IF block I think you'll find the alert() inside the IF block will never be executed, hence your form is always submitted whether you check any boxes or not.

If any of the checked properties is true, return true. If there is only one form in the document: */ function is One Checkbox Checked(form) (Not tested) Mick Well, the issue is this: I create an unknown number of check boxes.An HTML combobox shows a dropdown list of items from which one item is selected.By default the caption for that list is the first item.From that you should be able to figure out what the problem is with your IF condition.Validate your HTML form with Javascript validation.

Search for validating a checkbox in javascript:

validating a checkbox in javascript-64

Leave a Reply

Your email address will not be published. Required fields are marked *

One thought on “validating a checkbox in javascript”