By the end of this project, you will have written and tested JavaScript and HTML code that validates data values entered into input fields on an HTML form. Data validation is a valuable skill in web development. Notifying users of input errors not only improves the user experience it also helps to ensure that any data collected via a form is as accurate as possible before sending it to a server for processing.
Validate HTML Forms with JavaScript and HTML
Validate HTML Forms with JavaScript and HTML
Instructor: Judy Richardson
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4.6
(13 reviews)
Intermediate level
Recommended experience
2 hours
Learn at your own pace
Hands-on learning
What you'll learn
Explain the importance of verifying the data values entered on a form.
Write JavaScript code that validates values entered on an HTML form.
Demonstrate techniques for validating values entered on a form using HTML built-in validation.
Skills you'll practice
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Taught in English
No downloads or installation required
Only available on desktop
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About this Guided Project
Learn step-by-step
In a video that plays in a split-screen with your work area, your instructor will walk you through these steps:
Compare client- and server-side validation as you investigate when and where to validate data values to reduce data input errors.
Use JavaScript code to check an input field on a form to ensure that it has been filled in and display an error message if the field is empty.
Use JavaScript to test the value entered into a form field to determine its length and/or whether it falls within a range of numeric values and display an error message if that is not the case.
Test the value entered into a form to ensure that it matches an email address format and display an error message if it does not.
Modify HTML code to include built in form validation to check for a range of numbers, a list of values and the correct format for an email address.
Recommended experience
Basic knowledge of JavaScript and HTML (with exposure to forms) is recommended.
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How you'll learn
Skill-based, hands-on learning
Practice new skills by completing job-related tasks.
Expert guidance
Follow along with pre-recorded videos from experts using a unique side-by-side interface.
No downloads or installation required
Access the tools and resources you need in a pre-configured cloud workspace.
Available only on desktop
This Guided Project is designed for laptops or desktop computers with a reliable Internet connection, not mobile devices.
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