How to use strings as array indexes using JavaScript?
Javascript does not have a true hashtable object, but through its wierdness, you can use the array as a hashtable.
<script type="text/javascript">
var days = ["Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday","Saturday"];
for(var i=0; i < days.length; i++) {
days[days[i]] = days[i];
}
document.write("days[\"Monday\"]:"+days["Monday"]);
</script>
This produces
days["Monday"]:Monday
How to use “join()” to create a string from an array using JavaScript?
“join” concatenates [...]
What does the delete operator do?
The delete operator is used to delete all the variables and objects used in the program ,but it does not delete variables declared with var keywor
How tp create Arrays using JavaScript ?
<script type="text/javascript">
var days = new Array();
days[0] = "Sunday"
days[1] = "Monday"
days[2] = "Tuesday"
days[3] = "Wednesday"
days[4] = "Thursday"
days[5] = "Friday"
days[6] = [...]
How to find radio button selection when a form is submitted?
<script type="text/javascript">
function findButton() {
var myForm = document.forms.animalForm;
var i;
for(i=0;i<myForm.marsupial.length; i++) {
if(myForm.marsupial[i].checked) {
break;
}
}
alert("You selected \""+myForm.marsupial[i].value+"\".");
}
</script>
<form name="animalForm" action="">
<input type="radio" name="marsupial" value="kangaroo" />
Kangaroo
Opossum
Tasmanian Tiger
<input type="button" name="GO" value="GO" onclick="findButton()" />
How to disable an HTML object ?
document.getElementById(”myObject”).disabled = true;
To write messages to the screen without using “document.write()” ?
Changing the contents of [...]
What does the term sticky session mean in a web-farm scenario? Why would you use a sticky session? What is the potential disadvantage of using a sticky session?
Sticky session refers to the feature of many commercial load balancing solutions for web-farms to route the requests for a particular session to the same physical machine that [...]
What is the difference between a web-garden and a web-farm?
Web-garden – An IIS6.0 feature where you can configure an application pool as a web-garden and also specify the number of worker processes for that pool. It can help improve performance in some cases.
Web-farm – a general term referring to a cluster of physically separate machines, [...]
How to read and write a file using javascript?
I/O operations like reading or writing a file is not possible with client-side javascript. However , this can be done by coding a Java applet that reads files for the script.
How to detect the operating system on the client machine?
In order to detect the operating system on [...]
What is JavaScript?
JavaScript is a general-purpose programming language designed to let programmers of all skill levels control the behavior of software objects. The language is used most widely today in Web browsers whose software objects tend to represent a variety of HTML elements in a document and the document itself. But the language can be–and [...]
What is the difference between an Interface and an Abstract class?
An abstract class can have instance methods that implement a default behavior. An Interface can only declare constants and instance methods, but cannot implement default behavior and all methods are implicitly abstract. An interface has all public members and no implementation. An abstract class is [...]
What is Data Access Object pattern?
The Data Access Object (or DAO) pattern: separates a data resource’s client interface from its data access mechanisms adapts a specific data resource’s access API to a generic client interface
The DAO pattern allows data access mechanisms to change independently of the code that uses the data.
The DAO implements the access [...]
What are the two basic ways in which classes that can be run as threads may be defined?
A thread class may be declared as a subclass of Thread, or it may implement the Runnable interface.
What is the difference between an if statement and a switch statement?
The if statement is used to select among two alternatives. [...]
