Start learning with our library of video tutorials taught by experts. Get started

JavaScript and AJAX
Illustration by

Sending JSON data to the page


From:

JavaScript and AJAX

with Ray Villalobos

Video: Sending JSON data to the page

In the last movie we set up the HTML document for our Live Search application. In this movie we'll go ahead and start creating our JavaScript file. We're going to use JavaScript and jQuery. So, let's take a look at the HTML from the previous movie. It's just pretty simple: a single form element with an ID of search plus an additional div that has an ID of Update. Both of those are going to be pretty important in our script, so let's dig in. I will switch over to my script file, and I'll start off by doing some things we've done in previous movies. First, I'll just read the JSON data and output it into our update div.

Watch this entire course now—plus get access to every course in the library. Each course includes high-quality videos taught by expert instructors.

Become a member
please wait ...
JavaScript and AJAX
1h 12m Intermediate Jan 18, 2013

Viewers: in countries Watching now:

The ability to read data and communicate information asynchronously is fundamental to modern web applications. In this course, author Ray Villalobos takes a look at integrating AJAX (Asynchronous JavaScript and XML) with JavaScript and jQuery—a combination that makes it easy to work with dynamic data and reduces the number of requests to the server. The course first explains what AJAX is, and shows how to load and reload pages with pure JavaScript, update the DOM, and read and parse data in the XML and JSON formats. Next, learn how to read and write information between the server and the client with AJAX methods in jQuery, and build a dynamic search application that updates search results as you type.

Topics include:
  • What is AJAX?
  • Making requests asynchronous
  • Updating the DOM with getElementById
  • Reading JSON files
  • Working with jQuery and AJAX
  • Sending and searching JSON data
  • Incorporating CSS transitions
Subjects:
Developer Web Programming Languages Web Development
Software:
Ajax JavaScript
Author:
Ray Villalobos

Sending JSON data to the page

In the last movie we set up the HTML document for our Live Search application. In this movie we'll go ahead and start creating our JavaScript file. We're going to use JavaScript and jQuery. So, let's take a look at the HTML from the previous movie. It's just pretty simple: a single form element with an ID of search plus an additional div that has an ID of Update. Both of those are going to be pretty important in our script, so let's dig in. I will switch over to my script file, and I'll start off by doing some things we've done in previous movies. First, I'll just read the JSON data and output it into our update div.

So I will start off by using getJSON. I will get the data file, and the data will be fed into a function literal. This will read the JSON file and then, as a callback, will run an anonymous function and pass along the data that we have. One trick that I've learned from debugging JavaScript for years is to try to test things out as soon as I write them. So let's just go ahead and send this data to the console. I am going to save this and I will switch over to my browser. I will refresh, and then I'll do a right-click-- I am in Google Chrome right now--and select Inspect Element.

Then go over to the console. Make sure that we have this object right here showing, which we do. That means that my jQuery is working properly. It's getting the element from the file, and it's retrieving it and putting it into this console. So that's great. Now let's go ahead and output that data into our div. Let me take out the console.log here. And I will create a variable called output, and I will start by feeding it just an unordered list tag. I will add a class so that I can target it with CSS.

I will close that out. Now we can use the each statement to output the list items. This is a function literal, and we'll get the key and value variables set up. Now we need to start outputting just the names like before, but this time I'm going to put the beginning and closing li tags on their own line. That just makes it easier to add other elements.

So I am going to add an h2 tag here and output the name from the value variable that gets created from this each statement right here. Now all I need to do is output the HTML into my update div. So let me save that and I will switch back over to my browser and hit the Refresh button.

You can see one of the names come up here. Let me make that a little bigger. All the names are now coming up from the JSON document. Now we can add the rest of the elements we want from the JSON file. Let's go ahead and add the image tag. In the image tag I am going to use the field called shortname. It just has a simplified version of the persons' names. So if they have three names, or this Jonathan G. Ferrar II, I just call them Jonathan Ferrar and then put an underscore in between them, and those relate to the file names of the images that I have for each speaker.

In my script file, I can just use that, making sure that I target the images folder, then the slash, that shortname, and then _tn, for thumbnail, .jpg. For the alt, I will just make it the name of the speaker. For the biography, I am going to copy this one and just stick it in a paragraph tag, and just call the val.bio. So let's take a look at this in the browser. We'll refresh, and we could see the name of the author, the photo, and the bio come up.

Perfect! So, so far, our page is simply displaying the information from our JSON document. It's not very different from what we've done in past videos. In the next movie, I'll show you how we can capture events from the search field and create a search engine for our JSON file.

There are currently no FAQs about JavaScript and AJAX.

 
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.
Upgrade now


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

join now Upgrade now

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed JavaScript and AJAX.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Are you sure you want to delete this note?

No

Notes cannot be added for locked videos.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.