It is important to validate the form submitted by the user because it can have inappropriate values. The Java Script provides you the facility the validate the form on the client side so processing will be fast than server-side validation.So, most of the web developers prefer Java Script form validation.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(This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, Math ML, etc.The time field will allow input starting with 'hh:mm' following by an optional 'am' or 'pm'. The code behind the form is as follows: For each field in the form (first the dates, then the time field), a check is made as to whether the input is blank.
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.
The script has a catalog of almost all the common validation types built-in.
The idea is to create a set of “validation descriptors” associated with each element in a form.
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.
In other words if the first condition fails, the second condition will not be tested and so forth.