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jQuery Essential Training
Illustration by Don Barnett

Building hover tooltips


From:

jQuery Essential Training

with Joe Marini

Video: Building hover tooltips

So, now let's go implement that tooltips feature that we saw, when we rolled over the surfboard and we show the user a large thumbnail of the board that they are looking at, rather than making them go to a separate webpage. I am going to go ahead and open up my file here in my Editor and let's go to the site. Remember that was in the gear section, and I am going up the boards file here. So, a couple of things I want to point out.
Expand all | Collapse all
  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

Building hover tooltips

So, now let's go implement that tooltips feature that we saw, when we rolled over the surfboard and we show the user a large thumbnail of the board that they are looking at, rather than making them go to a separate webpage. I am going to go ahead and open up my file here in my Editor and let's go to the site. Remember that was in the gear section, and I am going up the boards file here. So, a couple of things I want to point out.

Here is the webpage, and what I am going to do is scroll down to the bottom. So you can see down here at the bottom, there's a div here whose class has been set to tooltipContent, and the tooltipContent is, if we go look at our CSS. So, let's first find that. That tooltipContent div is positioned absolutely and set to have a display of none and then opacity of zero.

So this is the large graphic that the user is going to see when we mouse over the view larger item. So if we scroll up here we will see that the view larger, that little Plus sign, is right here and you can see that has a link to the larger image page that opens in a new window, and it's got this id right here named viewlarger. So, what we are going to do is we want to write some script code that allows the user to mouse over and show the larger thumbnail, but we want to write it in a way that doesn't take away the default functionality when JavaScript is turned off.

So, we are not going to make any changes here in the markup; all we are going to do is write some jQuery code right up at the top of the document. What I am going to do is start off by including the jQuery Library. So I am going to come over here and copy that link that I have in my Index page and just paste it into my boards. And remember that the gear folder is one more level down, so I am going to put a little extra slash in there. So once I have done that, I am going to write a script, and the type is going to be text/javascript.

What we want to have happen is when the user hovers the mouse over the view larger item, the thumbnail image will appear and then it will fade out when they move their mouse back out again. Recall from earlier we have a helper function that does just that for us and it's called the hover function. We want all this to get setup on the document load. I am going to write a little document ready function. And remember throughout the course I have been doing something like this, where I say document.ready. There's a shortcut version that jQuery gives you where you simply pass the document.ready function directly to the jQuery object.

So I am just going to go ahead and do that here as a shortcut. What we want to have happen is we are going to use jQuery to get a reference to that view larger item and remember that it has an id on it of viewlarger and on the viewlarger item we are going to define a hover function. Remember that the hover function takes two function arguments. The first of which is the function that you wanted to have called when the mouse enters the element.

The second is the function that you want to have called when the mouse leaves. In the function for when the hover begins, we are going to use jQuery and we are going to define an offset variable, which gets the offset of the gear item in the page. Let's scroll down real quick. So, the gearItem is right here. It's this div, and this div is what contains the little thumbnail, the smaller image.

So there's the image and it has the little viewlarger and the other links in it. So we are going to get the id of this guy right here, because that's whose position we want. So we are going to use jQuery to do that and we are going to get the gearItem and we are going to use our CSS function offset and recall from our CSS chapter, this gets us the offset information for that item and this works on cross-browsers. Now that we have the offset information for the gearItem, we are going to use jQuery to move the overlay on top of the small image.

So to do that, recall that the tooltip is contained within a div named tooltip1. We are going to set some CSS properties on that. We are going to set the top property to the offset.top that just came back. Then we are going to use a little statement chaining to do the same thing with the left property. I am going to do offset.left, and then finally we are going to make it visible, and we will do that with some CSS.

And we will do display and we will call block. Now, again, there's a lot of ways to skin this cat. I am doing separate CSS calls. There is probably more efficient ways to do this, but for the sake of illustration, this way it makes it pretty clear to see what's going on. Then after we have positioned it, made it visible, we are going to animate it up. So once again, we get tooltip1 and we are going to animate the opacity value up to 1.0, over the course of 300 milliseconds.

So it's going to happen very quickly. So that will make it visible, and in fact, let's just quickly test that in the browser. So, we will bring up the site, go to the gear, go to the boards, mouse over, okay there it is. It's not going away however. So we are going to fix that. So that's this function here. So to make it go away when the mouse moves out, we will just write another jQuery statement that tells tooltip1 to animate its opacity setting down to zero, over the course of 300 milliseconds and we are going to define a callback function and the callback function is going to set tooltip1, and we are going to set its display back to being invisible.

So, that's all there is to that. We are now at a point where we can go back to the browser and test this out. So let's switch back to the browser. Let's refresh and now when we move it up, you can see it's fading in. It's fading out. Everything is all nice. So that's creating a tooltip. Let's move on now to the next feature.

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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