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jQuery Essential Training
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Inserting content


From:

jQuery Essential Training

with Joe Marini

Video: Inserting content

Let's take a look at inserting content using jQuery. So, jQuery provides several functions for inserting content into the document and for modifying the document object model's DOM tree. And you can insert content into the document before and after existing page elements. You can also insert content inside of elements. There is a bunch of functions to do this. So, let's go over them. Append and Prepend functions allow you to insert content inside of other elements.
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  1. 2m 52s
    1. Welcome
      1m 9s
    2. Using the exercise files
      1m 43s
  2. 17m 37s
    1. What is jQuery?
      5m 19s
    2. Downloading and installing jQuery
      2m 20s
    3. Creating a simple jQuery-enabled page
      7m 12s
    4. Overview of features in jQuery
      2m 46s
  3. 59m 57s
    1. Overview of selectors and filters
      2m 9s
    2. Using basic jQuery selectors
      9m 6s
    3. Using basic jQuery filters
      8m 35s
    4. Using jQuery attribute filters
      6m 7s
    5. Child, visibility, and content filters
      9m 59s
    6. Form selectors and filters
      9m 3s
    7. Traversing documents
      9m 1s
    8. Understanding jQuery statement chaining
      1m 42s
    9. Practical example 1: Annotating page links
      4m 15s
  4. 47m 16s
    1. Creating, getting, and setting content
      5m 53s
    2. Manipulating attributes
      5m 43s
    3. Inserting content
      4m 57s
    4. Wrapping, replacing, and removing content
      5m 27s
    5. Working with CSS
      6m 19s
    6. Associating data with page elements
      9m 30s
    7. Practical example 2: Automatic TOC generator
      9m 27s
  5. 33m 6s
    1. Understanding the jQuery event handling features
      2m 4s
    2. Binding and unbinding events
      6m 23s
    3. Convenient event helper methods
      4m 40s
    4. Using the jQuery event object
      6m 21s
    5. Using miscellaneous event features
      4m 38s
    6. Practical example 3: Table striping and highlighting
      9m 0s
  6. 28m 45s
    1. Hiding and showing elements
      5m 23s
    2. Fading elements in and out
      4m 2s
    3. Sliding elements
      4m 3s
    4. Creating custom animations
      5m 58s
    5. Practical example 4: Image rotator
      9m 19s
  7. 25m 30s
    1. Introduction to jQuery UI
      3m 40s
    2. Exploring the jQuery UI widgets
      5m 24s
    3. Exploring the jQuery UI effects
      3m 58s
    4. Using the jQuery UI ThemeRoller
      4m 11s
    5. Downloading and installing jQuery UI
      8m 17s
  8. 47m 49s
    1. Overview of the sample web site
      3m 50s
    2. Using the accordion widget
      9m 14s
    3. Creating an image rotator
      10m 22s
    4. Building hover tooltips
      7m 26s
    5. Making an image selector
      9m 30s
    6. Using the Resizable effect
      7m 27s
  9. 30m 2s
    1. Working with Asynchronous JavaScript and XML (AJAX)
      10m 8s
    2. Using AJAX helpers
      4m 34s
    3. Understanding AJAX data types
      10m 14s
    4. Using global AJAX event handlers
      5m 6s
  10. 20s
    1. Goodbye
      20s

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jQuery Essential Training
4h 53m Beginner Sep 01, 2009 Updated May 24, 2013

Viewers: in countries Watching now:

In jQuery Essential Training, Microsoft professional Joe Marini presents the power of the jQuery library, an open-source JavaScript project that greatly simplifies the process of adding advanced functionality to web sites. Joe teaches how to use these new features to build pages that work across browsers with the functionality that users (and clients) are looking for, from complex animation effects to dynamic page formatting. Joe pulls all of this together, showing how the jQuery UI plug-in can expand and streamline the capability of jQuery, and then integrating jQuery design tools into a complete sample web site. Exercise files accompany the course.

Topics include:
  • Constructing jQuery selectors and filters to gather information from web pages
  • Creating, inserting, and manipulating web page content
  • Understanding jQuery statement chaining
  • Building event handlers that work across browsers
  • Working with jQuery effects, such as showing, hiding, and fading page elements
  • Creating custom animations with specialized properties and options
  • Using the jQuery UI plug-in to give pages a polished look
Subjects:
Developer Web Web Design Web Development
Software:
jQuery
Author:
Joe Marini

Inserting content

Let's take a look at inserting content using jQuery. So, jQuery provides several functions for inserting content into the document and for modifying the document object model's DOM tree. And you can insert content into the document before and after existing page elements. You can also insert content inside of elements. There is a bunch of functions to do this. So, let's go over them. Append and Prepend functions allow you to insert content inside of other elements.

So the Append function takes the content here and that will append the content inside every one of matched elements that this function is being called on. Conversely, the Prepend function will take content and put it at the beginning of the inside of every matched element. The appendTo and prependTo work pretty much the same way. Although they're called on jQuery selectors. So, in this case, you're specifying the content to append; in this case you're saying here is the set of matched elements I want to append or prepend content to.

So, that's for inserting inside of elements. The after and before are kind of analogous to the Append and the Prepend functions. So, the After function takes content and inserts it after each one of the matched elements. The Before function inserts content before each one of the matched functions. And we saw an example of the After function in one of our previous lessons when we were building our annotated page links. The insertAfter and insertBefore again, they work the same way.

Only in this case, they take jQuery selectors to insert matched elements before or after another set of matched elements that will match this selector. Let's take a look at some examples and we'll see how this works. Here in the exercise_files folder, I am going to open up the inserting_start file and this is the finished version right here. So, let's go ahead and do that. I am going to open this up in my editor. So, you can see we're back using pretty much the same document that we've been using for a couple of different examples now.

This is the one with the unordered list and some paragraphs. So, here's what we're going to do. Let's jump back over to source code. Let's try out some of these functions. So, first thing I am going to do is write a jQuery statement for paragraphs. So, I am going to get all the paragraphs in the document and I am going to append some content to them. And what I am going to append is a string that says "with some content appended." Okay, so if we scroll down you see that This is paragraph 1, This is paragraph 2 and we're going to add the string on to the end of each one.

So, let's go ahead and back out to the browser. We're going to start this up. And you can see what happened was each one of the paragraphs now has the string with some content appended on it. That content was appended to each one of the matched elements and in this case, let's go back to the code. We've got all of the paragraphs. If I were to do something like a filter like last or first or something then only those paragraphs would have been affected. So, let's try something else. Let's do the opposite. Let's do p, only this time we're going to prepend.

I am going to write, "Hello!" Okay. So now the same thing is going to happen this time. I am going to save and we're going to back out to the browser. Okay, now when we refresh, you can see that in this case the word Hello has been prepended or inserted at the beginning of each paragraph. Back to the code. Let's get a little more fancy. What we're going to do now we're going to use the appendTo and prependTo functions for manipulating the DOM tree. So what we're going to do is write a jQuery accessor that says get me the last paragraph and append that to the first paragraph.

Let's save that. Go to the browser and see what happens. I am going to refresh. And you can see what happened is paragraph 4, which used to be down here at the bottom, has now been appended to paragraph 1. So, we took the last paragraph and appended it to the first. Let's do a variation on that theme. Comment this one out. But using that as the basis for the next one. What we're going to do in this case is instead of appendTo, we're going to say prependTo.

Okay, so now we're going to save. Go back to the browser. So, now I am going to refresh it and you can see now that the last paragraph has been prepended in front of the first paragraph. Okay, so I think you pretty much get the idea. This pretty much wraps up using the content inserting functions. That should give you an idea of how you can insert content into your document and use these functions to move elements around within the DOM tree.

Find answers to the most frequently asked questions about jQuery Essential Training.


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Q: When attempting to download jQuery, as the author does in the movie “Downloading and installing jQuery,” the file does not download. When any of the links on the download page are clicked, the browser opens a page of code instead.
A: This sometimes happens when a web browser doesn't have the proper MIME type to prompt the user to download the file instead of open it directly. Therefore, the browser is opening the code instead of downloading it. If this occurs, download the file on a by Control-clicking (Mac) or right-clicking (Windows) on the download link and choosing the Save File option, which will download it to the computer.
Q: Why do some of the examples use the form $("document") instead of just $(document)?
A: jQuery's $(document).ready() function will work with either form. As a reminder, you can also just use the $() shorthand to accomplish the same thing:
 
$(function() {
// code to run when the document is ready
});
Q: I am stuck on the first exercise in Chapter 1, video 3 "Creating a simple jQuery enabled page".

Your example javascript code, both in the movie and in the exercise files,
reads as follows:

<script type="text/javascript">
$("document").ready(function() {
alert("The page just loaded!");
});
</script>

This is not working for me.
A: After jQuery 1.3.2, a change was made where quotes were no
longer needed around the "document" argument to the jQuery $() function.

Type the following instead.

<script type="text/javascript">
$(document).ready(function() {
alert("The page just loaded!");
});
</script>
Q: How do I remove the resize handle that appears on on <textarea> elements in some browsers, such as Firefox and Chrome?
A: Some browsers automatically provide this feature for these text elements. You can disable this feature using CSS by providing a style rule for the element that specifies no resize behavior. Add the rule "resize: none;" to a stylesheet that is applied to the textarea, and the resize handle will not appear.

Q: This course was updated on 5/24/2013. What changed?

A: This update includes a new chapter on the jQuery AJAX features, new movies on associating data with page elements, and updates to the chapters on events and the jQuery UI plugin to reflect changes in JQuery 1.8.
Q: In Chapter 7, for the "Using the Resizable effect" movie, the example code from the Groundswell_Final and Groundswell_Start folders isn't limiting the width of the window. What should I do?
A: There's a bug in the example file. You need to add: 
textarea { resize:none;}

to the main.css file in the _css folder, and change the link tag in register.htm from:

<link href="../_css/sunny/jquery-ui-1.7.2.custom.css" rel="stylesheet" type="text/css" media="screen, projection" />

to

<link href="../_css/sunny/jquery-ui-1.10.2.custom.css" rel="stylesheet" type="text/css" media="screen, projection" />

 
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