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.
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.
But if the user unchecks the box, the user DOESNT have to enter info in textarea.
The value of a text input box (or a textarea or password input) is available using the syntax that tells you which option has been selected.
The illustration below shows this relationship: Note that the 'I' in selected Index needs to be capitalised - Java Script functions and variables are always case-sensitive. Read more about the humble checkbox in our HTML5 Checkbox Validation article.
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.
Following pictorial shows in which field, what validation we want to impose.
How would we set those validations 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.
You'll see that the all validation scripts presented on this and subsequent pages adhere to the same basic format.Tags: Adult Dating, affair dating, sex dating