в 10:02, 26 мая 2010

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2010-05-26T07:25:36Z

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==Add multiple Events to an Element, create custom Events and fire an Event==



<source lang="html4strict">


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style rel="stylesheet" type="text/css">
textarea {
float: left;
background: #f8f8f8;
border: 1px solid #d6d6d6;
border-left-color: #e4e4e4;
border-top-color: #e4e4e4;
padding: 0.3em;
margin-top: 10px;
overflow: auto;
}

#log {
float: left;
padding: 0.5em 0em 0.2em;
margin-left: 10px;
width: 290px;
height: 50px;
border: 1px solid #d6d6d6;
border-left-color: #e4e4e4;
border-top-color: #e4e4e4;
margin-top: 10px;
visibility: hidden;
font-size: 25px;
font-weight: bold;
text-align: center;
}

</style>
<script type="text/javascript" src="mootools.js"></script>
<script type="text/javascript">
window.addEvent("domready", function() {
var textarea = $("myTextarea"), log = $("log");

// We define the highlight morph we"re going to
// use when firing an event
var highlight = new Fx.Morph(log, {
duration: 1500,
link: "cancel",
transition: "quad:out"
});

// Here we start adding events to textarea.
// Note that "focus" and "keyup" are native events, while "burn"
// is a custom one we"ve made
textarea.addEvents({
focus: function() {
// When focusing, if the textarea contains value "Type here", we
// simply clear it.
if (textarea.value.contains("Type here")) textarea.value = "";
},

keyup: function() {
// When user keyups we check if there are any of the magic words.
// If yes, we fire our custom event burn with a different text for each one.
if (textarea.value.contains("hello")) textarea.fireEvent("burn", "hello world!");
else if (textarea.value.contains("moo")) textarea.fireEvent("burn", "mootools!");
else if (textarea.value.contains("pizza")) textarea.fireEvent("burn", "Italy!");
else if (textarea.value.contains("burn")) textarea.fireEvent("burn", "fireEvent");
// note that in case of "delayed", we are firing the event 1 second late.
else if (textarea.value.contains("delayed")) textarea.fireEvent("burn", "I"m a bit late!", 1000);
},

burn: function(text) {
// When the textarea contains one of the magic words
// we reset textarea value and set the log with text
textarea.value = ""; log.set("html", text);

// then we start the highlight morphing
highlight.start({
backgroundColor: ["#fff36f", "#fff"],
opacity: [1, 0]
});
}
});
});
</script>
<title>Elements Event Demo</title>
</head>
<body>
<h1>Events</h1>
<h2>Introduction</h2>
<p>
This demo will show you how to: add multiple Events to an Element, create custom Events and fire an Event.
</p>
<p>
In below textarea you can type whatever. Typing one of listed "Magic Words" will cause Event "burn" to fire and starting an effect (see js code)
</p>
<p>
Magic Words to type: <strong>hello</strong>, <strong>moo</strong>, <strong>pizza</strong>, <strong>burn</strong>, <strong>delayed</strong> (this last one will fire after 1 second).
</p>
<div id="inner_demo">
<textarea id="myTextarea" name="textarea" cols="40" rows="6">Type here...</textarea>
</div>
<div id="log">

</div>
</body>
</html>

</source>

==With MooTools it is easy to define often used actions as custom events for elements==



<source lang="html4strict">


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style rel="stylesheet" type="text/css">
div.floated {
width: 400px;
float: left;
margin-left: 1em;
}
input#myElement, div#myScrollElement {
border: 1px solid black;
background-color: #f9f9f9;
float: left;
margin: 5px;
padding: 3px;
width: 134px;
}
div#myDivElement {
clear: left;
width: 150px;
}
div#myScrollElement {
width: 200px;
height: 200px;
overflow: auto;
float: left;
background-color: #e8a3a3;
}
div#myScrollElement div {
height: 500px;
}
div#myOtherDivElement {
margin-top: 10px;
font-weight: bold;
float: left;
}
</style>
<script type="text/javascript" src="mootools.js"></script>
<script type="text/javascript">
// We define a custom event called "keyenter" which is based on the keyup event
Element.Events.keyenter = {
base: "keyup",
condition: function(e){
// We can basically put any logic here.
// In this example we return true, when the pressed key is the
// Enter-Button so the keyenter event gets fired.
return e.key=="enter";
}
};
window.addEvent("domready", function(){
// First Example

// Here we add the custom event to the input-element
$("myElement").addEvent("keyenter", function(e){
// We can do everything here: submitting a form, sending an AJAX-Request and so on
// because it only fires when the user presses the Enter-Button
e.stop();
// But instead we only change the text of an element.
$("myDivElement").set("text", "You pressed enter").highlight();
});

// Second Example
var el = $("myScrollElement"),
color = new Color(el.getStyle("background-color")).hsb;

el.addEvent("mousewheel", function(e){
e.stop(); // prevent the mousewheel from scrolling the page.

// Again we just set the text of an element and highlight it
$("myOtherDivElement").set("text", "Wheel " + (e.wheel < 0 ? "down" : "up")).highlight();

// But we add some nice logic to it to change the background-color
var hue = color[0];
if (e.wheel < 0){
hue -= 5;
if(hue < 0) hue = 360;
} else {
hue += 5;
if (hue > 360) hue = 0;
}

color[0] = hue;

this.setStyle("background-color", color.hsbToRgb());
});
});
</script>
<title>Slider Demo</title>
</head>
<body>
<h1>Custom Events</h1>
<h2>Introduction</h2>
<p>
With MooTools it is easy to define often used actions as custom events for elements.
This is especially useful for input-elements. This demo shows you how to define
a custom event, that only fires when you press the Enter-Button inside the given element.
</p>
<input type="text" id="myElement" name="myElement" value="Press enter here" />
<div class="help floated">
<strong>Why?</strong> Custom events are really useful when the standard
events are just not enough. See the Mouseenter-Demo for a more advanced
example.
</div>
<div id="myDivElement"></div>
<h2>Mousewheel-Event</h2>
<p>
The mousewheel event is a custom MooTools-Event, which allows you to use the
scrollwheel as an event, because every browser handles it differently. Try to
use your mousewheel over the element below.
</p>
<div id="myScrollElement"><div></div></div>
<div id="myOtherDivElement"></div>
</body>
</html>

</source>

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