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Validating and Processing Forms with JavaScript and PHP
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Limiting uploads by MIME types


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Validating and Processing Forms with JavaScript and PHP

with Ray Villalobos

Video: Limiting uploads by MIME types

Some HCMO Five attributes are super useful for file validation. You can tell a browser to accept only certain files by using the accept attribute and passing it some MIME types. So what is a MIME type? MIME stands for Multipurpose Internet Mail Extensions. It started out as a format for allowing email attachments in the SNTP protocol, but it has grown way beyond that and is used heavily all over the web. And MIME specification starts out with a main type like image or video, followed by a sub type like JPG or PNG. The accept attribute normally prevents a browser from choosing files that don't meet our criteria.
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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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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 Web Design Databases Web Development
Software:
JavaScript PHP
Author:
Ray Villalobos

Limiting uploads by MIME types

Some HCMO Five attributes are super useful for file validation. You can tell a browser to accept only certain files by using the accept attribute and passing it some MIME types. So what is a MIME type? MIME stands for Multipurpose Internet Mail Extensions. It started out as a format for allowing email attachments in the SNTP protocol, but it has grown way beyond that and is used heavily all over the web. And MIME specification starts out with a main type like image or video, followed by a sub type like JPG or PNG. The accept attribute normally prevents a browser from choosing files that don't meet our criteria.

So let's see how that works. Here's a form that's asking the user to upload a file. So I'm going to hit this choose file button. Here I have a bunch of files with different types. So notice that I can choose any of the types that I want. I'm going to hit cancel, and I'll go into the code for this page, and in the file input type, I'm going to add an except attribute. I'll ask for only images that are in the PNG format. So I'll save that, come back here, I'll refresh the page, and I'll hit the choose file button again and see what happens. Now notice that I can only choose the nameplate.png because it's the only PNG file.

You can also accept all image file types by using a star. So if I hit save, I'm going to come back here, refresh. Hit choose file, and go back. Notice that I can select a car, which is a JPEG, and this nameplate, which is a PNG. Now I can only choose one at a time, but if I add the keyword multiple as an attribute, I can choose more than one file. When I refresh this page, notice that it says choose files. So I'll click on this. And I can now hold down the command key on a Mac or the control on a PC, and select more than one file at time.

You can also choose a list of different types by using commas. So I can say I want to use only audio that is in the MP3 format, as well as any video file. I'll save this, come back here and refresh, and hit the choose file button, and now I can choose this motionpass.mov movie as well as these two audio files. Now if you want to see a comprehensive list of available MIME types, make sure you check out this website. This is the official registry of MIME media types.

So I can't wait for the day when these attributes are standard across all browsers. They offer a lot of functionality for a very small price. However for the time being, you'll probably need to test in whatever browser your site needs to support.

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