Validating and Processing Forms with JavaScript and PHP
Illustration by John Hersey

Adding required fields and placeholders


From:

Validating and Processing Forms with JavaScript and PHP

with Ray Villalobos

Video: Adding required fields and placeholders

One of the most helpful HTML5 atrributes for form validation is the required attribute. On browsers that support it, it will prevent the form from being submitted unless the input is filled out. I'll be using this form from our exercise files. This is one of the forms I styled in my course on CSS styling forms. If we take a look at the code for this page, you can see a single input field. I'm going to add the required attribute to the input field and then switch over to the browser. I'll refresh the form. And if I try to submit it without filling it out, I'll get a little error message that says please fill out this field. It also won't let me submit the form.
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  1. 3m 36s
    1. Welcome
      1m 9s
    2. What you should know
      1m 2s
    3. Using the exercise files
      1m 25s
  2. 12m 50s
    1. Understanding forms
      2m 2s
    2. Working with form fields
      7m 4s
    3. Using the form tag
      3m 44s
  3. 19m 23s
    1. Using input validation
      2m 10s
    2. Adding required fields and placeholders
      1m 31s
    3. Constraining numeric and date fields
      2m 32s
    4. Accepting multiple entries
      1m 41s
    5. Limiting uploads by MIME types
      2m 35s
    6. Assisting text input with a datalist
      1m 55s
    7. Constraining with regular expression patterns
      6m 59s
  4. 42m 13s
    1. Accessing forms
      3m 57s
    2. Looking up form elements
      3m 35s
    3. Handling focus changes
      2m 47s
    4. Detecting the onchange event
      4m 31s
    5. Using the selectedIndex property
      2m 30s
    6. Dynamic validation with regular expressions
      7m 0s
    7. Creating a generic input validation function
      4m 31s
    8. Validating in older browsers with Modernizr
      7m 32s
    9. Interrupting form submission with onsubmit
      5m 50s
  5. 15m 20s
    1. Understanding jQuery
      3m 47s
    2. Validating on submit with jQuery
      3m 45s
    3. Building interactive jQuery validation
      2m 34s
    4. Using the jQuery Validation plugin
      5m 14s
  6. 32m 57s
    1. Communicating with PHP servers
      2m 27s
    2. Retrieving data from superglobals
      8m 18s
    3. Using server-side validation
      4m 59s
    4. Adding in-page validation
      5m 22s
    5. Mirroring input data back to the user
      7m 46s
    6. Sanitizing form input
      4m 5s
  7. 43m 29s
    1. Mailing form data
      8m 28s
    2. Understanding file uploads
      3m 1s
    3. Uploading files
      9m 20s
    4. Processing form data with AJAX
      8m 14s
    5. Preparing your database
      5m 50s
    6. Pushing data
      8m 36s
  8. 1m 17s
    1. Next steps
      1m 17s

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Watch the Online Video Course Validating and Processing Forms with JavaScript and PHP
2h 51m Intermediate Apr 23, 2013

Viewers: in countries Watching now:

Validating web forms is a critical skill for any web developer, ensuring that the data that's submitted is complete, accurate, and nonmalicious before it's sent off to the server. Join author Ray Villalobos in this course as he shows how to validate input from site visitors with HTML5, JavaScript, and jQuery and then process the data with PHP. Plus, learn how to email form data and save it in a MySQL database so that it's ready for other applications.

Topics include:
  • Understanding forms
  • Adding required fields and placeholders
  • Accepting multiple entries
  • Limiting uploads
  • Handling focus changes
  • Validating with regular expressions
  • Working with older browsers
  • Building jQuery validation
  • Using server-side validation
  • Sanitizing form input
  • Uploading files
  • Sending form data to a database
Subjects:
Developer Web
Software:
JavaScript PHP
Author:
Ray Villalobos

Adding required fields and placeholders

One of the most helpful HTML5 atrributes for form validation is the required attribute. On browsers that support it, it will prevent the form from being submitted unless the input is filled out. I'll be using this form from our exercise files. This is one of the forms I styled in my course on CSS styling forms. If we take a look at the code for this page, you can see a single input field. I'm going to add the required attribute to the input field and then switch over to the browser. I'll refresh the form. And if I try to submit it without filling it out, I'll get a little error message that says please fill out this field. It also won't let me submit the form.

When you use the required attribute, it's always a good idea to also use the placeholders attribute. Placeholders give users a hint as to how they're supposed to fill out our field. That way, the user will know that I don't simply want their first name. Let me refresh this page. And you can see that it appears as a grayed out item. As soon as I start typing something in here, it will disappear. It's always a good idea to give users feedback with things like required fields and placeholders, but you shouldn't rely totally on this type of validation because not all browsers support it. A good place to check is the website caniuse.com.

You can check for support for any HTML5 feature by doing a search. You can see that the required parameter only works on newer versions of IE and none of the mobile browsers. To learn more about forms, make sure you check out HTML5 Web Forms in Depth, with Joe Marini.

There are currently no FAQs about Validating and Processing Forms with JavaScript and PHP.

 
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