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Marking required fields

From: HTML5 First Look

Video: Marking required fields

Another area in form functionality that has required the use of either JavaScript or server-side scripting solutions is in form validation. Form validation helps to ensure that the proper form elements are being filled out, that the data entered is formatted correctly, and in some cases is used to help guide the user through the form submittal process. While client-side or server-side scripting solutions are still going to be necessary for robust form validation, HTML5 gives us new tools in helping to validate form fields by being able to mark fields as required.

Marking required fields

Another area in form functionality that has required the use of either JavaScript or server-side scripting solutions is in form validation. Form validation helps to ensure that the proper form elements are being filled out, that the data entered is formatted correctly, and in some cases is used to help guide the user through the form submittal process. While client-side or server-side scripting solutions are still going to be necessary for robust form validation, HTML5 gives us new tools in helping to validate form fields by being able to mark fields as required.

So again I have the trails.htm file open and this one is found in 05_04 folder and I am just going to scroll down to my form again. So here we have our placeholder text in place and our form is looking pretty much the way we left it last time. So what we are going to do is we are going to take the trail name, the name of the writer, and email, and we are going to mark all of those items as required. All right, so I am going to go back to my trail name. Now you will notice autofocus is back again and that's just so that when we test itin our browser it will jump right to the form and we want to worry about scrolling down, but if you don't like it there feel free to go ahead and get rid of that.

Right, so I am going to type in a space right after autofocus and I am just going to type in required. So required is another attribute value that is a Boolean value and as we have with our other Boolean values we don't have to specifically say true or false. If we want the value to be true we can just say required. So we are going to do that for our trail name input, we are going to do it here for our name input, and we are going to do it here for our email input. So required for all of those guys. So we are going to go ahead and save that.

Now again, the only browser that's going to give us any type of feedback right now about this at all is Opera. So I am going to test this in Opera and we are going to see how some devices or browsers might respond to this. So, if I scroll down to the Submit button and I just click that, notice that Opera sort of have some default form validation already built in. It says "Hey, you have to specify a value." So okay I will just something in. You know, something nonsensical. I will submit it again and it says "No, no, no, you have to submit a value here" and finally, it says "No, no, no, you have to do it for email too". But watch this. So again if I just type in something an email and submit it again, now it's saying "Hey, that is not an illegal email address." So again it's taking advantage of the fact that that particular input field is specified as being an email input.

So even then the browser is able to say, "Well, this is a-- it is required and it's an email." So here we have some form validation built directly into the device or directly into the browser. Of course, I wouldn't expect that to replace your own form validation. You are going to want to be able to guide the user through. You are probably not going to want to rely on the device for that functionality. It's something you want to build yourself. But again the nice thing is that gives you a little bit of a fallback security for specific browsers or devices and the other thing that it does for you is by being able to mark a field as required, you have another hook that you can use when you are scripting your own form validation. So that's pretty cool.

So by being able to mark these fields as required, you are able to position your form in a way that makes it easier to write validation overall, regardless whether using client-side or server-side. Now given that we can now also be more specific about the type of form element that's required, we now have even more options to create robust and interactive form validation for our users.

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This video is part of

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HTML5 First Look

50 video lessons · 73890 viewers

James Williamson
Author

 
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  1. 3m 56s
    1. Welcome
      1m 1s
    2. Using the exercise files
      1m 50s
    3. Who is this course for?
      1m 5s
  2. 21m 12s
    1. Exploring prior standards
      4m 26s
    2. Why do we need HTML5?
      3m 32s
    3. HTML5 timeline
      4m 24s
    4. Current HTML5 support
      4m 25s
    5. What HTML5 is (and what it isn't)
      4m 25s
  3. 27m 49s
    1. HTML5 vs. HTML4
      3m 25s
    2. New structural tags
      6m 1s
    3. New content tags
      4m 7s
    4. New application-focused tags
      5m 32s
    5. Deprecated elements
      4m 28s
    6. API overview
      4m 16s
  4. 22m 29s
    1. Content models
      5m 33s
    2. Understanding the outline algorithm
      3m 21s
    3. The role of ‹div› tags
      4m 20s
    4. Using ID and class attributes
      2m 6s
    5. DOCTYPE declarations
      4m 16s
    6. Character encoding
      2m 53s
  5. 41m 27s
    1. Basic page structure
      3m 40s
    2. Structuring top-level elements
      7m 30s
    3. Structuring interior content
      8m 42s
    4. Building headers
      9m 11s
    5. Checking document outlines
      5m 46s
    6. Ensuring cross-browser structure
      6m 38s
  6. 27m 53s
    1. New input types
      5m 57s
    2. Setting form autofocus
      2m 53s
    3. Using placeholder data
      4m 4s
    4. Marking required fields
      3m 24s
    5. Working with number inputs
      5m 49s
    6. Using date pickers
      5m 46s
  7. 1h 1m
    1. Canvas overview
      6m 21s
    2. Adding canvas content
      8m 58s
    3. Drawing in the canvas environment
      12m 9s
    4. Drag-and-drop API overview
      6m 18s
    5. Offline applications overview
      7m 11s
    6. Video overview
      5m 45s
    7. Encoding video
      8m 23s
    8. Adding video
      5m 58s
  8. 57m 33s
    1. Geolocation API overview
      5m 50s
    2. Web storage API overview
      5m 40s
    3. WebSockets overview
      4m 16s
    4. CSS3 overview
      6m 38s
    5. Enhancing typography with CSS3
      7m 42s
    6. Using @font-face
      7m 11s
    7. Styling HTML5 with CSS3
      10m 23s
    8. Using CSS3 transitions
      9m 53s
  9. 5m 6s
    1. Final thoughts
      3m 49s
    2. Goodbye
      1m 17s

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