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jQuery Essential Training

Wrapping, replacing, and removing content


From:

jQuery Essential Training

with Joe Marini
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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 jQuery's features
      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

Video: Wrapping, replacing, and removing content

In this lesson, we are going to see how to use jQuery for wrapping, replacing, and removing content. Up until now, we have seen how to insert and manipulate some content, but now we are going to do a little bit of additional operations. So, in addition to inserting content, jQuery has a bunch of functions for doing some additional operations like wrapping content in the page, replacing it, copying it, removing it, all that great stuff. So here is the list of functions that you use in order to do that. And as you can see there is a half-a- dozen functions just for wrapping the content.

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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 today's 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 Mobile Apps Web Mobile Web Web Development
Software:
Ajax jQuery jQuery Mobile
Author:
Joe Marini

Wrapping, replacing, and removing content

In this lesson, we are going to see how to use jQuery for wrapping, replacing, and removing content. Up until now, we have seen how to insert and manipulate some content, but now we are going to do a little bit of additional operations. So, in addition to inserting content, jQuery has a bunch of functions for doing some additional operations like wrapping content in the page, replacing it, copying it, removing it, all that great stuff. So here is the list of functions that you use in order to do that. And as you can see there is a half-a- dozen functions just for wrapping the content.

So, let's take a look at those. The Wrap functions basically takes matched elements and wraps them inside something else. So, in this case for example the Wrap function will take each one of the elements on the matched set that you are calling the Wrap function on, and place them inside the HTML that you specify here. So, for example if I was calling the Wrap function on a whole bunch of images, and I passed the String, like DIV inside here, then each one of the images will be wrapped inside it's own separate DIV.

Similarly, the Wrap Element works pretty much the same way. Each one of the elements inside the matched set that this is being called on, will be wrapped inside the element that I specify here. The wrapAll works pretty similarly although what it does is rather than wrapping each one of the individually matched elements into it's own wrapper. It will take all of the elements inside the matched set and place them in either the HTML that I am specifying here, or the element. And finally, the wrapInner functions will wrap the inside trial contents of each matched element, including text within either HTML or the DOM element that specify here assuming that the DOM element that I am passing is allowed to have children inside of it.

So, for example Images can't have child elements inside them. So that would work. If I call wrapInner on an ul tag and I had a whole bunch of allies, then all those allies will be wrapped inside whatever I passed in as this HTML or this HTML or this element. So that's wrapping you can also replace. So the replaceWith function, you give it some content, and it will replace all of the matched elements in the result set with whatever content you specify here. And content either be HTML or a series of DOM elements.

And the replaceAll basically replaces the elements that are matched by the selector with the matched elements. So, this selector here is going to be used to find which should be replaced by the all the elements that are being called on. And the last couple of functions are some pretty convenient functions, Empty basically removes all the child notes from all the elements that are in the set, and you are calling it on. Remove just removes all the matched elements from the DOM. So, what you do is you write your jQuery selector, then you Call, Remove and then all those elements taken out the document.

Then the Clone function makes copies. So, this Clone function clones the matched DOM elements and then selects all the clones. This version here which takes a Boolean argument, if you pass True then it will clone not only the elements, but it will also copy all the event handlers, whereas this one will not. Okay so that's a trip down that function set. Let's take a look at some examples in the code. I am going to open up my wrapping_start file right here.

The same document we have been working on. The list is here paragraphs, and so on. Let's do a couple of experiments. So let's wrap all the paragraph tabs, and let's wrap each one into a DIV who's style has been set to color:red. So all the text inside those DIVs should be red. We need to put that in a tag. So, let's do that and then let's close the DIV off.

Okay, so let's try that out, go to the browser and see what happens. So, you can see that the paragraphs two and four. The ones that did not have classes set on them, have now changed to Red text. And that's because these guys do not have any style set, so their text color is being affected by the DIV that it was wrapped into. Let's try another example. Let's go back to the code. Let's try wrapping all of the paragraphs in a DIV whose style is let's just see, border: 3px solid red, save.

And go back to the browser and let's refresh. You can see that the wrapAll functions has taken all of the paragraphs, and wrapped them inside a DIV whose border is now red, and three pixels wide. Okay so far so good. Let's go back to the code, let's comment this guys out. All right, now let's try the remove the Empty function. So, I am going to write a expression here that gets the unordered list and I am going to call Empty, and go back to browser and refresh, and you can see that the list items have now all then emptied out from the unordered list.

Okay, so that should give you a pretty good idea of how these functions work. Now you have seen how to create content, you've seen how to insert it, and now you're going to go have to do some other manipulations on it like wrapping and replacing and removing.

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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