We'll also look at how to check other types of fields, such as checkboxes, radio buttons and drop-down lists.Let's look at a more complex validated form with some different types of form fields. Try pressing the Send Details button without filling in the form and see what happens.Form validation is the process of checking that a form has been filled in correctly before it is processed.For example, if your form has a box for the user to type their email address, you might want your form handler to check that they've filled in their address before you deal with the rest of the form.I know there are ways to do this with radio buttons and checkboxes, but can it be done with dropdowns as well? Could you please give me an example of how to check them one at a time and how to concatonate the errors if they exist? The name of my form is "my Form"I have not been able to find code anywhere that incorporates the 2 (That is, empty or alpha). might help: Rather than using alert()s for each field, just concatenate the error messages together into a string (separated by e.g.
As a finishing touch, try making the script move the cursor to the field that needs filling in each time ( I'm hoping you can provide me with some guidance.
If the user has not completed more than one field, then they will see an alert box appear for each field that is missing.
Now you know how to write a form validation script that can handle multiple form fields, including text boxes, radio buttons, drop-down lists and check boxes!
Our example script works by validating all the form fields at once.
This can be a bit confusing for the user, especially if they've missed out more than one field, as they will get lots of alert boxes appearing and they might forget which fields they need to fill in!
There are two main methods for validating forms: (usually done using Java Script).