JavaScript Validation | different types of restrictions | registration form | form validation
JavaScript Validation | Registration Form | Console Debugging | Form | JavaScript Function JS Error
If a form field (FirstName, LastName, MobileNumber) is empty, this function alerts a message, and returns false, to prevent the form from being submitted:
Console Debug :
A list of JavaScript objects to output. The string representations of each of these objects are appended together in the order listed and output to the console.
JavaScript Function :
A JavaScript function is a block of code designed to perform a particular task.
A JavaScript function is executed when "something" invokes it (calls it).
JavaScript Variable :
Variables are containers for storing data (storing data values).
In this example, x, y, and z, are variables, declared with the var keyword:
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