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JavaScript Essential Training

Hiding and showing form sections


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JavaScript Essential Training

with Simon Allardice

Video: Hiding and showing form sections

In this example, rather than react to the onsubmit of the form, I am actually going to react to an event of an individual form element-- in this case, this check box, that when I check it is activating or turning on another section of the form itself. This is very, very simple to do. Let me show you the general process and a few best practices for doing this. So I am going to jump into my editor. The HTML here is very, very straightforward. The section that has multiple check boxes in it is wrapped in a div with an id of tourSelection.
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  1. 3m 28s
    1. Welcome
      1m 1s
    2. What you should know
      1m 44s
    3. Using the exercise files
      43s
  2. 15m 41s
    1. Introduction to JavaScript
      8m 6s
    2. Creating your first JavaScript
      2m 13s
    3. Getting to know the tools and applications
      5m 22s
  3. 56m 8s
    1. Understanding the structure of JavaScript code
      7m 9s
    2. Where to write your JavaScript
      3m 56s
    3. Creating variables
      6m 21s
    4. Working with conditional code
      5m 44s
    5. Working with operators
      13m 28s
    6. Sending messages to the console
      2m 59s
    7. Working with loops
      8m 1s
    8. Creating functions
      8m 30s
  4. 36m 13s
    1. Working with arrays
      7m 57s
    2. Working with numbers
      6m 13s
    3. Working with strings
      8m 27s
    4. Working with dates
      5m 38s
    5. Working with objects
      7m 58s
  5. 9m 6s
    1. What is the DOM?
      5m 49s
    2. Working with nodes and elements
      3m 17s
  6. 25m 17s
    1. Accessing DOM elements
      11m 3s
    2. Changing DOM elements
      5m 42s
    3. Creating DOM elements
      8m 32s
  7. 24m 45s
    1. Introduction to JavaScript event handling
      8m 16s
    2. Working with onClick and onLoad events
      7m 36s
    3. Working with onBlur and onFocus events
      2m 36s
    4. Working with timers
      6m 17s
  8. 21m 41s
    1. Common JavaScript errors
      7m 14s
    2. Using Firebug
      4m 7s
    3. Going through a debugging session
      10m 20s
  9. 10m 13s
    1. Accessing form elements
      4m 20s
    2. Preventing a form from being submitted
      2m 36s
    3. Hiding and showing form sections
      3m 17s
  10. 9m 49s
    1. CSS and JavaScript
      3m 46s
    2. Removing and applying CSS classes
      2m 16s
    3. Changing inline styles
      3m 47s
  11. 19m 44s
    1. Understanding JavaScript style
      7m 39s
    2. Minifying your code
      4m 28s
    3. Using JavaScript code checkers
      7m 37s
  12. 22m 24s
    1. Introduction to JavaScript libraries
      3m 17s
    2. Linking to multiple JavaScript files
      2m 11s
    3. Introduction to jQuery
      12m 7s
    4. Using a content distribution network to deliver JavaScript files
      4m 49s
  13. 17m 35s
    1. JavaScript in HTML5
      9m 37s
    2. Using Modernizr
      3m 2s
    3. Using Strict Mode
      4m 56s
  14. 33m 3s
    1. Knowing the JavaScript to avoid
      6m 35s
    2. Introduction to regular expressions
      6m 56s
    3. Working with AJAX
      10m 44s
    4. Working with objects and prototypes
      8m 48s
  15. 21m 10s
    1. Example: Countdown
      8m 3s
    2. Example: Resize
      5m 47s
    3. Example: Accordion
      7m 20s
  16. 4m 58s
    1. Where to go from here
      4m 0s
    2. Goodbye
      58s

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JavaScript Essential Training
5h 31m Beginner Jul 22, 2011

Viewers: in countries Watching now:

Use JavaScript to add new features and a richer, more compelling user interface on web pages. This course keeps current best practices and practical uses for JavaScript in mind, while covering syntax, working with the DOM, and developing and debugging across multiple platforms, devices, and browsers. Author Simon Allardice also shows how to progressively enhance and gracefully degrade web pages, and take advantage of the world of JavaScript libraries now available.

Topics include:
  • Understanding the structure of JavaScript code
  • Creating variables, functions, and loops
  • Writing conditional code
  • Sending messages to the console
  • Working with different variable types and objects
  • Creating and changing DOM objects
  • Event handling
  • Working with timers
  • Debugging JavaScript
  • Building smarter forms
  • Working with CSS, HTML5, and JavaScript
  • Using regular expressions
Subjects:
Developer Web Programming Languages Web Development
Software:
JavaScript
Author:
Simon Allardice

Hiding and showing form sections

In this example, rather than react to the onsubmit of the form, I am actually going to react to an event of an individual form element-- in this case, this check box, that when I check it is activating or turning on another section of the form itself. This is very, very simple to do. Let me show you the general process and a few best practices for doing this. So I am going to jump into my editor. The HTML here is very, very straightforward. The section that has multiple check boxes in it is wrapped in a div with an id of tourSelection.

Now, there are no CSS or other styling properties being applied to it, so it actually isn't hidden by default, and that's quite important. We'll talk about that 'why' in a moment. So going into my JavaScript, just a few simple lines, and getting rid of the last three here, this is just a window.onload that is calling preparePage. So everything is in this preparePage function. This gets called once, and what we do is here. I'm volunteering to react to the onclick event of an element called brochures.

This is the id of the check box in my HTML. So I'm just saying, when that gets clicked, we will perform this anonymous function. Of course, the click could be either checking it in on or checking it off, so the first check is, what is it? And we don't ask for a value here; I asked for the .checked property of brochures. I don't need to say is it equal to true or is it equal to false, because the.checked property is a Boolean.

So just by putting this in my condition I'm asking, this is true, I don't need to say if true equals true, it's just, is it true? If it is, what I'm going to do is grab the div called tourSelection that contains all the other check boxes, and then--and this is the first time we've seen these properties-- I'm using the .style.display property to drop into basically the CSS of this individual element and change that to block. Now, this is making it visible. This is the default way that it looks.

If it's checked, I want to see it. If there was a change and it wasn't checked, I am going to set that the same property to none, to hide it. So we've associated this if statement with the onclick event of the check box. The only other thing that I'm going to do is because this function gets called once, after I have subscribed to that event, I'm going to then say, but then go right ahead and hide that div. Now, the reason that I'm doing it here in my JavaScript is yeah, I could do it in CSS.

I could have actually hidden it in the HTML and CSS, but there's the problem. If somebody went to that page and their browser had JavaScript disabled, this is a much better way of doing it, what's often referred to as progressive enhancement, even though this is a simple example. We are using JavaScript to first enable certain behaviors. If the user doesn't have JavaScript, everything still works exactly the way it was before. But if they do have JavaScript enabled, we suddenly have a more interactive form.

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