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JavaScript
Questions about JavaScript - the Scripting Language used for Web development.
721 Questions
What is the difference between server-side and client-side image maps?
server-side and client-side. In the server-side method, when you click an image leading to multiple links, you are actually invoking a cgi-bin program. The program typically reads a separate map file that tells the program where to go, depending on what part of the image you are clicking. The program returns the destination to the web browser, which then opens the page. The imagemap is called "server-side" because the web browser must contact the remote host to find which site to contact.
Client-side imagemaps, by contrast, do not require a cgi-bin program to function. The imagemap is actually an HTML construct that can be contained on the same page as the clickable image. Rather than requiring the program on the remote host to determine what site to access, the web browser itself associates regions of the image with the appropriate sites. The browser, rather than the remote host, interprets the imagemap.
Explain briefly about Cascading Style Sheet?
Cascading Style SheetsCSS style sheets are blocks of code that can be embedded in a HTML page or stored in a .css file.
CSS manipulates the elements of a HTML webpage by changing the properties of the HTML elements in the page, such as BODY P or TABLE elements.
CascadingCascading or the Cascade refers to how the the final style will render, if the first block in a CSS sheet defines that all P tags will have black text and be font type Arial, then that will be the case for all P elements. But if in another block further down the page resets the P tag to have text that is green then all text in the P elements will be green. But all P tags will still have Arial type font.
Example Code:
Block 1
p {
color: #000000; /* Set to Black */
font-family: Arial;
CSS manipulates the elements of a HTML webpage by changing the properties of the HTML elements in the page, such as BODY P or TABLE elements.
CascadingCascading or the Cascade refers to how the the final style will render, if the first block in a CSS sheet defines that all P tags will have black text and be font type Arial, then that will be the case for all P elements. But if in another block further down the page resets the P tag to have text that is green then all text in the P elements will be green. But all P tags will still have Arial type font.
Example Code:
Block 1
p {
color: #000000; /* Set to Black */
font-family: Arial;
}
Block 2
p {
color: #00FF00; /* Set to Green*/
}
And in the case that another Block sets the P tag to have a background color of Blue:
Block 3
p {
bacground-color: #0000FF; /* Set to Blue */
}
Then the final Cascade will result in the P tag being:
Final Cascade
p {
bacground-color: #0000FF; /* Set to Blue */
color: #00FF00; /* Set to Green*/
font-family: Arial;
}
The import statement in Java allows to refer to classes which are declared in other packages to be accessed without referring to the full package name. You do not need any import statement if you are willing to always refer to java.util.List by its full name, and so on for all other classes. But if you want to refer to it as List, you need to import it, so that the compiler knows which List you are referring to.
Classes from the java.lang package are automatically imported, so you do not need to explicitly do this, to refer to String, for example.
How do you install java script on Android phone?
JavaScript comes pre-installed with the browser that Android runs by default. It cannot be "installed" and "uninstalled" on its own.
You may be trying to install Java, the programming language and VMs.
Is C is better than JavaScript?
You can't compare them it's like apples and oranges. Javascipt is mainly geared for client-side execution in a web browser. c is an old language and is sort of the parent of all modern programming languages including javascript, but it would be used in a totally different scenario, eg. you could use it for application development on a server or desktop, rather than in an online scenario.
What is the difference between Web UI and Java?
Java Virtual Machine (JVM) is exactly as it's titled, it's just a virtual machine... while Windows is an operating system.
But since the JVM is used to run Java code, it is multi-platform.
Synchronizaion is the process by which only one Thread can access an object at a time,until and unless thread releases it's lock no other thread can acess the object. there are two forms of syncronization method and statement.
to make a method synchronized just add the keyword synchronized to the signature ie: public synchronized void increment() {
c++;
}
to create syncrhonized statements are like this:
synchronized(this) {
lastName = name;
nameCount++;
}
note: constructors can not be syncronized
How do you create slide show using javascript code?
Here is the code:
<html>
<head>
<script type="text/javascript" language="javascript">
function loadImage()
{
var image1 = new Image();
var image2 = new Image();
var image3 = new Image();
image1.src = "mypic.jpg"; // Put any image you
image2.src = "mypic2.jpg";
image3.src = "mypic3.png";
if(!document.images)
{
alert("No Images!!");
}
document.images.slide.src=eval("image"+step+".src");
if (step<3)
step++;
else
step=1;
//call function "slideit()" every 4 seconds
setTimeout("loadImage()",4000);
}
loadImage();
</script>
</head>
<body onload="loadImage()">
<img src="mypic.jpg" class="image" name="slide" />
</body>
</html>
Which HTML element do you put the JavaScript?
In order to put JavaScript in a HTML document place the code in script tags. These tags can be included in the HEAD section of the HTML document, or in the BODY.
Often, scripts are placed at the very bottom of the page to enhance search engine optimization (SEO).