The later Java Script function created is called on the onsubmit event of the form. If Male or Female is selected, it generates an alert saying that the form is successfully submitted and it reloads the form.
is the external Java Script file which contains the Java Script ocde used to validate the form. Notice that for validation, the Java Script function containing the code to validate is called on the on Submit event of the form. Flowchart : Here is the entire Java Script used for validation of the form.
There are two ways to validate your forms: The basic premise of creating form validation is to look for the names of form elements that are required, and if they are empty, display an error message.Most error checking programs check each field one at a time, and display one error at a time.It sets the focus to the input field until the user supplies a valid value.When the user does so, they may proceed and can supply value to the next available field.A passionate web developer with over a decade experience in web industry.
Founder of SSD Tutorials, where he publishes his free and premium tutorials on how to build modern web applications.This article is part of the HTML Forms Tutorial This Perl script CGI snippet does the same thing as the Java Script.It checks to see if the required fields are there, and if not, saves an error message into a variable for display: The difference with how the CGI writes the error message is that instead of a "\n", it uses the HTML paragraph tag to put a new line in between each error.In the head portion of your HTML, you should create a script to do the form validation: See the validation script in action.Page 4: Use a Perl CGI script to validate your HTML forms.You have already learned a lot about these property settings in previous chapters, and you will learn more in Chapter 5, "Form Data." But this chapter focuses on setting and getting these property values at runtime through scripting.