The form in HTML will look like this: tag improves usability.
Clicking on the label will move the mouse cursor to the input with the id specified in the for attribute.
Because your database contains sensitive information, hackers may attempt to use your form to submit malicious commands to your backend database.
If you are using a My SQL database, this is called My SQL Injection.
From that you should be able to figure out what the problem is with your IF condition.
By validating form responses before accepting them, we can alert users to their errors before they submit the form.
However the function is only reporting issues with wrong email input, and its not validating the other fields in the form. Thanks HTML Edit: I just noticed you're using a class contentform and I thought it was an id.
I would also add an id to your form to be able to retrieve all form data with one DOM traversal instead of several.
However, to see whether a credit card has sufficient funds requires communicating with the credit card company and that can only be done using a server side programming language.
Similarly, form data is typically saved in a database on the server.
For example, suppose your user submits the form without entering a mandatory field.
If you validate the form using j Query, you can notice this and alert the user to their mistake instead of submitting the form.
The name of each input (or textarea) will be passed to the server to identify the contents of the form.