Form Validation Javascript Essential Training

Form Validation Javascript Essential Training

Javascript, TUTORIALS, WEB

Form Validation Javascript Essential Training




In our previous lesson we learned about the form submission and introduction to the form elements. In this Form Validation Javascript Essential Training lesson we are gonna learn how to validate the form with certain conditions. Here we set some condition like enter some data into email field.
If there is nothing in that field then it shows some error in the current page itself or else it redirect to another page successfully. Here we use the onsubmit() function to check when we click on the submit button in the form, and it checks whether it has the valid mail id or not.
So far we have to get the form by its id and load it when we refresh the page. From the forms id we can get the particular element id inside the form element. Here we take the email id for the example.

Form Validation Javascript Essential Training




The above shown is an simple form element as we seen in our previous lesson. And in this Form Validation Javascript Essential Training we put the fields in to some conditions and checks the results.
In Form Validation Javascript Essential Training the above script we create a function prepareEventHandlers() and checks the condition when we click on the onsubmit() function. And inside the form elements we’ve to find the email field by its id or name.
In default html tag also has the validation controls but they has some limitations, like readonly, required and something like this. If we wants to put a field into a rough conditions and checks its result then we have to use the javascript.
Form Validation Javascript Essential Training
And we checks if the field is empty or have some value inside it. If not then it shows some error message on the form in the some empty space.
If we doesn’t enter any of the field in the form then it asks the user to enter at least the email address to proceed next step. Then we have to enter and it redirect to the next page. And in that page we can shows any of the details we wants to display like we did in this Form Validation Javascript Essential Training lesson.
Form Validation Javascript Essential Training
And finally we conclude here the basics in the onsubmit() function and the form validation using javascript. We hope this lesson will gives you an idea about how to do the form validation using javascript.




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