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Convenient event helper methods

From: jQuery Essential Training

Video: Convenient event helper methods

In addition to basic functions for wiring up events in jQuery, there are also a whole bunch of higher-level event handling functions that you can use to handle common situations with events. For example, if I'm here in the API documentation, I'm going to scroll on down to the Events section and click on Mouse Events. And you can see that there are event handlers for things like click, and double-click, hover, mousedown, and mouseup, and so on. These are all a whole bunch of common high-level events that will happen in your web pages, and jQuery provides some nice high- level event handling functions to deal with them.

Convenient event helper methods

In addition to basic functions for wiring up events in jQuery, there are also a whole bunch of higher-level event handling functions that you can use to handle common situations with events. For example, if I'm here in the API documentation, I'm going to scroll on down to the Events section and click on Mouse Events. And you can see that there are event handlers for things like click, and double-click, hover, mousedown, and mouseup, and so on. These are all a whole bunch of common high-level events that will happen in your web pages, and jQuery provides some nice high- level event handling functions to deal with them.

And so we're going to exercise some of those in this particular lesson. Let's go over to the Example Files folder. Here in the Example Files I've got my helpers_start document, and I'm going to bring that up in the browser. Again, this is pretty much the same example we used in the previous movie. We're going to use the helper functions this time in order to hook up the hover event, along with a couple of other things. Let's go over to the code. All right! So here in the code I've got pretty much the same file as I had before.

This one has the div. It's got the style sheets normal and highlighted, only this time we're going to write the code using the helper functions. So, recall in the previous example I used the on function to bind events for mouseover and mouseleave. However, jQuery gives me a function that already does that. So, I'm just going to write dollar sign, and I'm going to get my evtTarget div. And I'm going to use the hover function. And the hover function basically takes two functions, and those two functions are what you want to happen when the mouse enters something and when the mouse leaves.

In this case, they're both going to be the same function, so I'm going to pass highlight and highlight. Now, I need to write the highlight function, so I'm going to write function highlight. And it's an event handler, so it's going to take an event argument, even though I'm not going to use it. Inside the highlight function I'm going to write the code to get the event target div, and I'm just going to toggle its class like I did last time, and the toggleClass is going to be highlighted.

Okay, that is this class right down here, which will basically change the background color to red. All right! So, I'm going to save, and let's go back to the browser. Let's refresh the file. And now you can see that I'm using the hover function to achieve pretty much the same result as I was achieving using the on function to bind events. Let's go back to the code. Let's use a couple other functions. Let's use a function for, let's see.

We're going to get the evtTarget, and this time we'll use the click function. For the click function what we'll do is we'll call a function called fnClick1. And that's what will happen when the user clicks on it. And let's add another one. Let's do ("#evtTarget").dblclick. This is for handling double-clicks. And we'll just use the fnClick2 function for this.

Now I'm going to write both of those. So, here in the function for fnClick1-- and again that's an event handler, but I'm not going to use the argument. All I'm going to do is simply set the content of the div, by using the HTML function. I'm going to have it say click for the fnClick2 function. I'm just going to copy and paste this. I'm going to write the word Double Click! So, what's happening here is, when the user clicks on the div, this function will get called, and when they double-click on it, this function will get called. So, let's save.

Let's go back to the browser. All right! Let's refresh. There is the hover behavior, and now I'm going to click, and you can see that the click handler causes the content that say Click. Now I'm going to double-click, and you can see that the content changes to Double Click! I can just do that to my heart's content now. So, that's an example of using the higher-level functions to achieve features and effects that you would normally have to use by using the lower-level event binding functions, and there's a whole bunch of these.

I encourage you to check them out.

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This video is part of

Image for jQuery Essential Training
jQuery Essential Training

49 video lessons · 96322 viewers

Joe Marini
Author

 
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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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