In other words if the first condition fails, the second condition will not be tested and so forth.
Only when all conditions have been satisfied do we reach the command, in which case the form will be submitted.
In our example, we have a login form with two input fields i.e.
username and password, As user clicks on login button, Java Script validation function comes into act.
var attempt = 3; //Variable to count number of attempts ............ Element By Id("username").disabled = true; Element By Id("password").disabled = true; Element By Id("submit").disabled = true; return false; } } }/* Below line is used for online Google font */ @import url(
Otherwise a browser with Java Script disabled, or a hacker trying to compromise your site, can easily submit invalid data. The first test in the example is therefore only necessary in order to provide a different error message when the input is blank.
The purpose of a form validation script is to return a boolean value ('s to reference form fields, but that can lead to namespace conflicts and why make things more complicated than necessary.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.