Manual Animation:
So let's implement one simple animation using DOM object properties and JavaScript functions as follows:<html>
<head>
<title>JavaScript Animation</title>
<script type="text/javascript">
<!--
var imgObj = null;
function init(){
imgObj = document.getElementById('myImage');
imgObj.style.position= 'relative';
imgObj.style.left = '0px';
}
function moveRight(){
imgObj.style.left = parseInt(imgObj.style.left) + 10 + 'px';
}
window.onload =init;
//-->
</script>
</head>
<body>
<form>
<img id="myImage" src="/images/html.gif" />
<p>Click button below to move the image to right</p>
<input type="button" value="Click Me" onclick="moveRight();" />
</form>
</body>
</html>
|
- We are using JavaScript function getElementById() to get a DOM object and then assigning it to a global variable imgObj.
- We have defined an initialization function init() to initialize imgObj where we have set its position and left attributes.
- We are calling initialization function at the time of window load.
- Finally, we are calling moveRight() function to increase left distance by 10 pixels. You could also set it to a negative value to move it to the left side.
Automated Animation:
In the above example we have seen , how an image moves to right with every click. We can automate this process by using JavaScript function setTimeout() as follows:<html>
<head>
<title>JavaScript Animation</title>
<script type="text/javascript">
<!--
var imgObj = null;
var animate ;
function init(){
imgObj = document.getElementById('myImage');
imgObj.style.position= 'relative';
imgObj.style.left = '0px';
}
function moveRight(){
imgObj.style.left = parseInt(imgObj.style.left) + 10 + 'px';
animate = setTimeout(moveRight,20); // call moveRight in 20msec
}
function stop(){
clearTimeout(animate);
imgObj.style.left = '0px';
}
window.onload =init;
//-->
</script>
</head>
<body>
<form>
<img id="myImage" src="/images/html.gif" />
<p>Click the buttons below to handle animation</p>
<input type="button" value="Start" onclick="moveRight();" />
<input type="button" value="Stop" onclick="stop();" />
</form>
</body>
</html>
|
- The moveRight() function is calling setTimeout() function to set the position of imgObj.
- We have added a new function stop() to clear the timer set by setTimeout() function and to set the object at its initial position.
Rollover with a Mouse Event:
Here is a simple example showing image rollover with a mouse events:<html>
<head>
<title>Rollover with a Mouse Events</title>
<script type="text/javascript">
<!--
if(document.images){
var image1 = new Image(); // Preload an image
image1.src = "/images/html.gif";
var image2 = new Image(); // Preload second image
image2.src = "/images/http.gif";
}
//-->
</script>
</head>
<body>
<p>Move your mouse over the image to see the result</p>
<a href="#" onMouseOver="document.myImage.src=image2.src;"
onMouseOut="document.myImage.src=image1.src;">
<img name="myImage" src="/images/html.gif" />
</a>
</body>
</html>
