In HTML or XML format, the validation logic is identical to on Blur validation, but the test is not done until the user submits the form.
Java Script form validation is a great way to help your users avoid mistakes when filling out a form Alternatively, if you want to protect your server from malicious users, then you should use server side validation because Java Script can be easily bypassed.
Executes Java Script whenever a user moves with the mouse the focus away from an element within a form.
In other words, whenever a person first clicks an element, and then clicks anywhere outside of it. Onblur is used when you want to check each element (ie: text, textarea boxes ) individually, and ask the user to correct the input before moving on to the next box.
In client side validation the data is validated in the browser using Java Script before submitting the data to the server.
For example, suppose your user submits the form without entering a mandatory field.
In HTML and XML format, Cold Fusion generates Java Script that runs on the browser to check whether entered data is valid and provide immediate feedback, if the entry is invalid.