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authorwei <>2007-01-14 02:10:24 +0000
committerwei <>2007-01-14 02:10:24 +0000
commit45b0fe42a979d444d547a5248eb2e9e915aaf16a (patch)
tree2480dae3350e4a70949956c41984cceb8dce3efc /demos/quickstart/protected/pages/Advanced/Scripts2.page
parent898049a4012eaecd99e7a418726215e656677809 (diff)
Add "block-content" to allow user comments on block level elements in quickstart docs.
Diffstat (limited to 'demos/quickstart/protected/pages/Advanced/Scripts2.page')
-rw-r--r--demos/quickstart/protected/pages/Advanced/Scripts2.page80
1 files changed, 40 insertions, 40 deletions
diff --git a/demos/quickstart/protected/pages/Advanced/Scripts2.page b/demos/quickstart/protected/pages/Advanced/Scripts2.page
index 2c9ce220..97d05897 100644
--- a/demos/quickstart/protected/pages/Advanced/Scripts2.page
+++ b/demos/quickstart/protected/pages/Advanced/Scripts2.page
@@ -3,16 +3,16 @@
<h2 id="6702">Basic event handling</h2>
-<p>The syntax for working with events looks like the code below.</p>
+<p id="840735" class="block-content">The syntax for working with events looks like the code below.</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840254">
Event.observe(element, name, observer, [useCapture]);
</com:TTextHighlighter>
-<p>Assuming for a moment that we want to observe when a link was clicked,
+<p id="840736" class="block-content">Assuming for a moment that we want to observe when a link was clicked,
we could do the following:</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840255">
// &lt;a id="clicker" href="http://foo.com"&gt;Click me&lt;/a&gt;
Event.observe('clicker', 'click', function(event)
{
@@ -20,9 +20,9 @@ Event.observe('clicker', 'click', function(event)
});
</com:TTextHighlighter>
-<p>If we wanted to get the element that fired the event, we'd do this:</p>
+<p id="840737" class="block-content">If we wanted to get the element that fired the event, we'd do this:</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840256">
Event.observe('clicker', 'click', function(event)
{
alert(Event.element(event));
@@ -31,9 +31,9 @@ Event.observe('clicker', 'click', function(event)
<h2 id="6703">Observing keystrokes</h2>
-<p>If we wanted to observe keystrokes for the entire document, we could do the following:</p>
+<p id="840738" class="block-content">If we wanted to observe keystrokes for the entire document, we could do the following:</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840257">
Event.observe(document, 'keypress', function(event)
{
if(Event.keyCode(event) == Event.KEY_TAB)
@@ -41,31 +41,31 @@ Event.observe(document, 'keypress', function(event)
});
</com:TTextHighlighter>
-<p>And lets say we wanted to keep track of what has been typed :</p>
+<p id="840739" class="block-content">And lets say we wanted to keep track of what has been typed :</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840258">
Event.observe('search', 'keypress', function(event)
{
Element.update('search-results', $F(Event.element(event)));
});
</com:TTextHighlighter>
-<p>Prototype defines properties inside the event object for some
+<p id="840740" class="block-content">Prototype defines properties inside the event object for some
of the more common keys, so feel free to dig around in Prototype to
see which ones those are.</p>
-<p>A final note on keypress events; If you'd like to detect a
+<p id="840741" class="block-content">A final note on keypress events; If you'd like to detect a
left click you can use <tt>Event.isLeftClick(event)</tt>.</p>
<h2 id="6704">Getting the coordinates of the mouse pointer</h2>
-<p>Drag and drop, dynamic element resizing, games, and
+<p id="840742" class="block-content">Drag and drop, dynamic element resizing, games, and
much more all require the ability to track the X and Y location of
the mouse. Prototype makes this fairly simple. The code below tracks
the X and Y position of the mouse and spits out those values into
an input box named mouse.</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840259">
Event.observe(document, 'mousemove', function(event)
{
$('mouse').value = "X: " + Event.pointerX(event) +
@@ -73,23 +73,23 @@ Event.observe(document, 'mousemove', function(event)
});
</com:TTextHighlighter>
-<p>If we wanted to observe the mouse location when it was
+<p id="840743" class="block-content">If we wanted to observe the mouse location when it was
hovering over a certain element, we'd just change the document argument to
the id or element that was relevant.</p>
<h2 id="6705">Stopping Propagation</h2>
-<p><tt>Event.stop(event)</tt> will stop the propagation of an event .</p>
+<p id="840744" class="block-content"><tt>Event.stop(event)</tt> will stop the propagation of an event .</p>
<h2 id="6706">Events, Binding, and Objects</h2>
-<p>Everything has been fairly straight forward so far, but things
+<p id="840745" class="block-content">Everything has been fairly straight forward so far, but things
start getting a little trickier when you need to work with events in
and object-oriented environment. You have to deal with binding and funky
looking syntax that might take a moment to get your head around.</p>
-<p>Lets look at some code so you can get a better understanding of what I'm talking about.</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<p id="840746" class="block-content">Lets look at some code so you can get a better understanding of what I'm talking about.</p>
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840260">
EventDispenser = Class.create();
EventDispenser.prototype =
{
@@ -141,15 +141,15 @@ EventDispenser.prototype =
}
}
</com:TTextHighlighter>
-<p>Whoa! What's going on here? Well, we've defined our a
+<p id="840747" class="block-content">Whoa! What's going on here? Well, we've defined our a
custom class <tt>EventDispenser</tt>. We're going to be using this class
to setup events for our document. Most of this code is a
rewrite of the code we looked at earlier except this time, we
are working from inside an object.</p>
-<p>Looking at the <tt>initialize</tt> method, we can really see how
+<p id="840748" class="block-content">Looking at the <tt>initialize</tt> method, we can really see how
things are different now. Take a look at the code below:</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840261">
// Observe clicks on our list items
$$(this.list + " li").each(function(item)
{
@@ -157,82 +157,82 @@ $$(this.list + " li").each(function(item)
}.bind(this));
</com:TTextHighlighter>
-<p>We've got iterators, binding and all sorts of stuff going on.
+<p id="840749" class="block-content">We've got iterators, binding and all sorts of stuff going on.
Lets break down what this chunk of code is doing.</p>
-<p>First we are hunting for a collection of elements based on
+<p id="840750" class="block-content">First we are hunting for a collection of elements based on
it's CSS selector. This uses the Prototype selector function <tt>$$()</tt>.
After we've found the list items we are dealing with we send
those into an each iteration where we will add our observers.</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840262">
Event.observe(item, 'click', this.showTagName.bindEvent(this));
</com:TTextHighlighter>
-<p>Now looking at the code above, you'll notice the <tt>bindEvent</tt> function.
+<p id="840751" class="block-content">Now looking at the code above, you'll notice the <tt>bindEvent</tt> function.
This takes the method before it <tt>showTagName</tt> and treats it as the
method that will be triggered when, in this case,
someone clicks one of our list items.</p>
-<p>You'll also notice we pass this as an argument to the <tt>bindEvent</tt> function.
+<p id="840752" class="block-content">You'll also notice we pass this as an argument to the <tt>bindEvent</tt> function.
This simply allows us to reference the object in context <tt>EventDispenser</tt>
inside our function <tt>showTagName(event)</tt>. If the <tt>showTagName</tt> function
requires additional parameters, you can attach them to the later parameters of <tt>bindEvent</tt>. For example</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840263">
this.showTagName.bindEvent(this, param1, param2);
//where the showTagName function is defined as
showTime : function (event, param1, param2) { ... }
</com:TTextHighlighter>
-<p>Moving on, you'll see <tt>bind(this)</tt> attached to our iterator function.
+<p id="840753" class="block-content">Moving on, you'll see <tt>bind(this)</tt> attached to our iterator function.
This really has nothing to do with events, it is only here to allow me to
use <tt>this</tt> inside the iterator. If we did not use <tt>bind(this)</tt>, I could not
reference the method <tt>showTagName</tt> inside the iterator.</p>
-<p>Ok, so we'll move on to looking at our methods that actually get
+<p id="840754" class="block-content">Ok, so we'll move on to looking at our methods that actually get
called when an event occurs. Since we've been dealing with <tt>showTagName</tt>, lets look at it.</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840264">
showTagName: function(event)
{
alert(Event.element(event).tagName);
}
</com:TTextHighlighter>
-<p>As you can see, this function accepts one argument--the event.
+<p id="840755" class="block-content">As you can see, this function accepts one argument--the event.
In order for us to get the element which fired the event we need to
pass that argument to <tt>Event.element</tt>. Now we can manipulate it at will.</p>
-<p>This covers the most confusing parts of our code. The text above is also
+<p id="840756" class="block-content">This covers the most confusing parts of our code. The text above is also
relevant to the remaining parts of our code. If there is anything about
this you don't understand, feel free to ask questions in the forum.</p>
<h2 id="6707">Removing Event Listeners</h2>
-<p>This one threw me for a loop the first time I tried to use it.
+<p id="840757" class="block-content">This one threw me for a loop the first time I tried to use it.
I tried something similar to what I did in the <tt>Event.observe</tt>
call with the exception of using <tt>stopObserving</tt>, but nothing seemed
to change. In other words, the code below does <b>NOT</b> work.</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840265">
$$(this.list + " li").each(function(item)
{
Event.stopObserving(item, 'click', this.showTagName);
}.bind(this));
</com:TTextHighlighter>
-<p>What's the deal here? The reason this does not work is because there
+<p id="840758" class="block-content">What's the deal here? The reason this does not work is because there
is no pointer to the observer. This means that when we passed <tt>this.showTagName</tt>
in the <tt>Event.observe</tt> method before hand, we passed it as an
anonymous function. We can't reference an anonymous function
because it simply does not have a pointer.</p>
-<p>So how do we get the job done? All we need to do is give the
+<p id="840759" class="block-content">So how do we get the job done? All we need to do is give the
observing function a pointer, or the jargon free version: Set a variable
that points to <tt>this.showTagName</tt>. Ok, lets change our code a bit.</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840266">
this.showTagObserver = this.showTagName.bindEvent(this);
// Observe clicks on our list items
@@ -242,8 +242,8 @@ $$(this.list + " li").each(function(item)
}.bind(this));
</com:TTextHighlighter>
-<p>Now we can remove the event listeners from our list like this:</p>
-<com:TTextHighlighter Language="javascript" CssClass="source">
+<p id="840760" class="block-content">Now we can remove the event listeners from our list like this:</p>
+<com:TTextHighlighter Language="javascript" CssClass="source block-content" id="code_840267">
$$(this.list + " li").each(function(item)
{
Event.stopObserving(item, 'click', this.showTagObserver);