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jQuery Essential Training
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Using the Resizable effect


From:

jQuery Essential Training

with Joe Marini

Video: Using the Resizable effect

This feature that we are going to add to our Groundswell site is the ability to resize the form element for entering comments on our registration form and this is going to illustrate using one of the jQuery UI interactions, which is the Resizable interaction. So what I am going to do is click on the Register link here and you can see that there is a Comments field here and it's pretty sizeable. The user can type their comments. But what if we want to make this resizable so the user has more area to type in? So what we are going to do is go over to the code and implement the jQuery UI Resizable interaction to let the user resize that comments area.
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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

Using the Resizable effect

This feature that we are going to add to our Groundswell site is the ability to resize the form element for entering comments on our registration form and this is going to illustrate using one of the jQuery UI interactions, which is the Resizable interaction. So what I am going to do is click on the Register link here and you can see that there is a Comments field here and it's pretty sizeable. The user can type their comments. But what if we want to make this resizable so the user has more area to type in? So what we are going to do is go over to the code and implement the jQuery UI Resizable interaction to let the user resize that comments area.

So let's go to the code. So here we are in the folder for the example, and inside the lifestyle, there is a register file. I am going to open that up in my editor. Let's find that in the design. So that's down here in the code. So this is the text area right here, and this text area, we are going to make resizable and you can see it's wrapped inside of a div named comments section, and the text area itself has an id of comments.

So a couple of things we are going to do. First, we need to include the necessary jQuery library and the jQuery UI library at the top of the file. So we are going to go back at the top and we are going to do that. And we also include the CSS file. So I am just going to copy and paste this and the file is in the sunny sub-folder because that's the thing we downloaded. And it's called jquery-ui-1.7.2.custom.

Okay, so now we have included the style sheet. Now we need to include the script file for both jQuery and jQuery UI. So we are going to do that. We are going to type script and the type is equal to JavaScript and the source is the scripts folder and it's jquery-1. 3.2.min.js and that's that script right there and then we are going to include the jQuery UI and that's jquery-ui-1.7.2.custom.min.js.

All right, so now that we have included the script, we can assign the resizable behavior to our text area. So let's go ahead and do that and remember that's just a simple matter in jQuery of when the page loads, and I am going to declare my little page load function right here. So when the page loads, we are going to use jQuery to get a reference to the Comments section div and we are going to make that resizable.

So that's pretty much all we need to do to make it resizable. Let's see how that works out. So jump over to the browser. I am going to refresh. So you can see now that a little resize handle has been added here at the bottom of the Comments field, so we can resize. But you can see that there is a bit of a problem. We don't want the user to be able to resize this thing across the entire page. It will be nice if we can just constrain it somehow so that they can't make it too small or too big.

So let's set about solving that problem. So let's go back to the code. So what we need to do is specify that there is a maximum and minimum width for the field. So here in my function, I am going to declare a couple of variables. First, I am going to declare a maxWidth variable and what I am going to do is I am going to set that to be whatever the current width of the field is. That way it can't get any bigger than it currently is.

So I am going to use jQuery to retrieve a reference to the Comments section div, and I am just going to ask for its width. Remember from our CSS section that we can get the width of any element by doing this. Now in the resizable call, pass in some parameters to resizable, because remember it takes some parameters like what we want the min width and max width to be, and so on and so forth. So we are going to pass in an object and I am going to say that the maxWidth can't be any more than the maxw.

That's should fix the max problem. Let's go back to the browser and see. So I am going to refresh and yeah, sure enough, it can't get any wider than it used to be. That's its maximum, so that's good. I still have to fix the minimum problems though. So let's go back to the code. So we are going to do the same thing for the minimum width and minimum height. I am going to declare another variable named min width and I am going to set that to be equal to max width. So that way, the text area will only stay as wide as it currently is.

It won't get any more narrow and it won't get anymore wide. And finally, I am going to declare another variable and this one is going to be called min height. I am going to do the same kind of trick that I did with the width. I am going to copy that, I am going to paste this and now I am going to ask for whatever the current height is. Okay, so now, I know how wide it is and how high it is. I did just set the right parameters. There is maxWidth. I am going to do min height and that's minh and I am going to do min width and that will be minWidth.

Now I have set all the right parameters, all I need to do now is save, and we will go back to the browser, and now we will refresh. So now you can see that I can only resize the element up and down. I can't make it any wider, I can't make it anymore narrow, and I can only resize it down to the point where it was as high as it was to begin with. So I have pretty much used jQuery UI now to provide a feature to my users. They can now type in the field and now they can enter text and if they don't think it's big enough, well, they can just go ahead and resize that down.

I will just scroll the page down. So they can make it as nice and large as they want to. And just to make sure it works cross browser, let's try it on Firefox. So I am going to open this up in the Firefox browser and I'll scroll down and you can see, yup, there is the resize handle, and sure enough, yup, working just the same way. So that's pretty much all the features that we are going to use from the jQuery UI library.

However I highly encourage you to experiment. You can take the source code for the Groundswell site as you have it in your example files folder, if you have access to the example files. Feel free to play around with the jQuery UI settings and see what you can make happen.

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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