The "Access Denied" error in any browser is due to the following reason. A JavaScript in one window or frame is tries to access another window or frame whose document's domain is different from the document containing the script. Read More

Use document. forms[0].submit(); (0 refers to the index of the form ? if you have more than one form in a page, then the first one has the index 0, second has index 1 and so on). Read More

A prompt box allows the user to enter input by providing a text box. Read More

put the HTML in a <div id="theDiv"> tag call the javascript function in any event like (onLoad ,onClick etc) document.getElementById("theDiv").style.vibility=hidden; Read More

In order to detect the operating system on the client machine, the navigator.appVersion<br>string (property) should be used. Read More

You can use onBlur() function of javascript. Read More

Clientside Javascript encompasses the core language plus extras such as the predefined objects, only relevant to running Javasript in a browser.The clientside javascript is embedded directly in the HTML pages and is interpreted by the browser... Read More

The pop() and push() functions turn a harmless array into a stack <script type="text/javascript"> var numbers = ["one", "two", "three", "four"]; numbers.push("five"); numbers.push("six"); document.write(numbers.pop()); document.write... Read More

The "delete" operator removes an array element, but oddly does not change the size of the array. <script type="text/javascript"> var days = ["Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday","Saturday"]; document.write("Number of... Read More

An alert box displays only one button which is the OK button whereas the Confirm box displays two buttons namely OK and cancel. Read More

Use the parseInt() function, that takes a string as the first parameter, and the base as a second parameter. So to convert hexadecimal 3F to decimal, use parseInt ("3F", 16); Read More

This depends on the user's browser and OS. In the case of Netscape with Windows OS,all the cookies are stored in a single file called cookies.txt c:Program FilesNetscapeUsersusernamecookies.txt In the case of IE,each cookie is stored... Read More

Join" concatenates the array elements with a specified seperator between them. <script type="text/javascript"> var days = ["Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday","Saturday"]; document.write("days:"+days.join(",")); <... Read More

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"]; ... Read More

The following example illustrates this It creates a function called square with argument x and returns x multiplied by itself. var square = new Function ("x","return x*x"); Read More

JavaScript is a platform-independent, event-driven, interpreted programming language developed by Netscape Communications Corp. and Sun Microsystems. Originally called LiveScript (and still called LiveWireTM by Netscape in its compiled, server... Read More

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 keyword. Read More

var re = new RegExp(" ^(&[A-Za-z_0-9]{1,}=[A-Za-z_0-9]{1,})*$" ) var text = myWidget.value var OK = re. test(text) if( ! OK ) { alert(" The extra parameters need some work. Should be something like: " &a=1&c=4" " ) } Read More

ECMAScript is yet another name for JavaScript (other names include LiveScript). The current JavaScript that you see supported in browsers is ECMAScript revision 3. Read More

&&, || and ! Read More

Breaking is possible within a string statement by using a backslash at the end but not within any other javascript statement. that is , document.write("Hello world"); is possible but not document.write ("hello world"); Read More

Undefined value means the variable used in the code doesnt exist or is not assigned any value or the property doesnt exist. Read More

First of all, here is the javascript function that tests if an email address is valid.<br>It checks for a lot of things: to see if the email contains a "@" sign and a dot, checks to see if the @ is before the dot, and so on.<br><br... Read More

ECMAScript is yet another name for JavaScript (other names include LiveScript). The current JavaScript that you see supported in browsers is ECMAScript revision 3. Read More

In order to detect the operating system on the client machine, the navigator.appVersion string (property) should be used. Read More

Objects have "prototypes" from which they may inherit fields and functions. <script type="text/javascript"> function movieToString() { return("title: "+this.title+" director: "+this.director); } function movie(title, director) { this... Read More

JavaScript's greatest potential gift to a Web site is that scripts can make the page more immediately interactive, that is, interactive without having to submit every little thing to the server for a server program to re-render the page and ... Read More

Continue statement continues the current loop (if label not specified) in a new iteration whereas break statement exits the current loop. Read More

Let's now create a custom "toString()" method for our movie object. We can embed the function directly in the object like this. <script type="text/javascript"> function movie(title, director) { this.title = title; this.director =... Read More

We can declare an array like this var scripts = new Array(); We can add elements to this array like this scripts[0] = "PHP"; scripts[1] = "ASP"; scripts[2] = "JavaScript"; scripts[3] = "HTML"; Now our array scrips has 4 elements inside it... Read More

Objects can be created in many ways. One way is to create the object and add the fields directly. <script type="text/javascript"> var myMovie = new Object(); myMovie.title = " Aliens"; myMovie.director = " James Cameron"; document... Read More

script type="text/javascript"> var numbers = ["one", "two", "three", "four"]; numbers.unshift("zero"); document.write(" "+numbers.shift()); document.write(" "+numbers.shift()); document.write(" "+numbers.shift()); </script> This produces... Read More

Fixed width tables are rendered by the browser based on the widths of the columns in the first row, resulting in a faster display in case of large tables. Use the CSS style table-layout:fixed to specify a fixed width table. If the table is not... Read More

Generation of HTML pages on-the-fly without accessing the Web server. The user can be given control over the browser like User input validation Simple computations can be performed on the client's machine The user's browser, OS, screen size... Read More

JavaScript allows a Web page to perform "if-then" kinds of decisions based on browser version, operating system, user input, and, in more recent browsers, details about the screen size in which the browser is running. While a server CGI program can... Read More

Fragmentation of the installed base of browsers will only get worse. By definition, it can never improve unless absolutely everyone on the planet threw away their old browsers and upgraded to the latest gee-whiz versions. But even then, there are... Read More

Yes.Since java script is a client-side script it does require the web server's help for its computation,so it is always faster than any server-side script like ASP, PHP, etc. Read More

JavaScript was developed by Brendan Eich of Netscape Java was developed at Sun Microsystems. While the two languages share some common syntax, they were developed independently of each other and for different audiences. Java is a full-fledged... Read More

No.java and java script are two different languages. Java is a powerful object - oriented programming language like C++,C whereas Java script is a client-side scripting language with some limitations. Read More

On their own, Web pages tend to be lifeless and flat unless you add animated images or more bandwidth-intensive content such as Java applets or other content requiring plug-ins to operate (Shockwave and Flash, for example). Embedding JavaScript... Read More

Browser version incompatibility is the biggest problem. It requires knowing how each scriptable browser version implements its object model. You see, the incompatibility rarely has to do with the core JavaScript language (although there have been... Read More

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... Read More

It?s a number in JavaScript, derived by dividing negative number by zero. Read More

One of the reasons JavaScript has the word "script" in it is that as a programming language, the vocabulary of the core language is compact compared to full-fledged programming languages. If you already program in Java or C, you actually have to... Read More

Use window.opener to refer to the main window from pop-ups. Read More

ViewState is specific to a page in a session. Session state refers to user specific data that can be accessed across all pages in the web application. Read More

All variables are of object type in JavaScript. Read More

Setting EnableViewStateMac=true is a security measure that allows ASP.NET to ensure that the viewstate for a page has not been tampered with. If on Postback, the ASP.NET framework detects that there has been a change in the value of viewstate that... Read More

GET: Parameters are passed in the query string. Maximum amount of data that can be sent via the GET method is limited to about 2kb. POST: Parameters are passed in the request body. There is no limit to the amount of data that can be... Read More

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 serviced the first request for that session. This is mainly used to ensure... Read More

1. To remove an item from a list set it to null mySelectObject.options[3] = null 2. To truncate a list set its length to the maximum size you desire mySelectObject.length = 2 3. To delete all options in a select object set the length to 0. ... Read More

It is true, text you last copied for pasting (copy & paste) can be stolen when you visit web sites using a combination of JavaScript and ASP (or PHP, or CGI) to write your possible sensitive data to a database on another server Read More

i)Undefined value cannot be explicitly stated that is there is no keyword called undefined whereas null value has keyword called null. (ii)typeof undefined variable or property returns undefined whereas typeof null value returns object. Read More

No. JavaScript does not have block level scope, all the variables declared inside a function possess the same level of scope unlike c,c++,java. Read More

Undeclared variables are those that are not declared in the program (do not exist at all),trying to read their values gives runtime error.But if undeclared variables are assigned then implicit declaration is done . Undefined variables are those that... Read More

No. java and JavaScript are two different languages. Java is a powerful object - oriented programming language like C++, C whereas JavaScript is a client-side scripting language with some limitations. Read More

Change the "visibility" attribute of the style object associated with your element. Remember that a hidden element still takes up space, use "display" to make the space disappear as well. if ( x == y) { myElement.style.visibility = 'visible&... Read More

JavaScript code can be embedded in a web page between <script langugage="javascript"> //Place Your JavaScript here. </script> tags Read More

In theory, we should cache the current state of the cursor and then put it back to its original state. document. body.style.cursor = 'wait'; //do something interesting and time consuming document.body.style.cursor = 'auto'; Read More

The Web has several FAQ areas on JavaScript. The best place to start is something called the meta-FAQ [14-Jan-2001 Editor's Note: I can't point to it anymore, it is broken!], which provides a high-level overview of the JavaScript help... Read More

You can prepend the number with an empty string var mystring = ""+myinteger; or var mystring = myinteger.toString(); You can specify a base for the conversion, var myinteger = 14; var mystring = myinteger.toString(16); mystring will be "e". Read More

the global method, "isNaN()" can tell if a number has gone bad. var temperature = parseFloat(myTemperatureWidget.value); if(!isNaN(temperature)) { alert("Please enter a valid temperature."); } Read More

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 keyword. Read More

Since 1 is a string, everything is a string, so the result is 124. Read More

The Page object in ASP. NET has two methods that allow emitting of client-side JavaScript: RegisterClientScriptBlock and RegisterStartupScript. Example usage: Page.RegisterClientScriptBlock("ScriptKey", "<script language=javascript>" + ... Read More

RegisterClientScriptBlock emits the JavaScript just after the opening tag. RegisterStartupScript emits the JavaScript at the bottom of the ASP. NET page just before the closing tag. Read More

Use the "value" property. var myValue = window.document.getElementById("MyTextBox").value; Read More

Determining the state of a checkbox in JavaScript var checkedP = window.document.getElementById("myCheckBox").checked; Read More

Setting the focus in an element using JavaScript <script> function setFocus() { if(focusElement != null) { document.forms[0].elements["myelementname"].focus(); } } </script> Read More

This can be achieved by using the following tag between head tags or between body tags. <script src="abc.js"></script>How to access an external JavaScript file that is stored externally and not embedded? where abc.js is the external... Read More

The best sites are the ones that use JavaScript so transparently, that I'm not aware that there is any scripting on the page. The worst sites are those that try to impress me with how much scripting is on the page. Read More

Since 2 and 5 are integers, this is number arithmetic, since 8 is a string, it?s concatenation, so 78 is the result. Read More

JavaScript supports the for loop, while loop, do-while loop, but there is no foreach loop in JavaScript. Read More

<a href='javascript:window.close()' class='anyCSSClass'> Close </a> Read More

Use the below specified style of comments <script language=javascript> <!-- javascript code goes here // --> or Use the <NOSCRIPT>some html code </NOSCRIPT> tags and code the display html statements between these and this will... Read More

Use // for a single line comments in JavaScript and /* start of Multiple lines comment in JavaScript Multiple line comments in JavaScript */ for block comments in JavaScript Read More

Number.MAX_VALUE Number.MIN_VALUE Read More

The null value is a unique value representing no value or no object. It implies no object, or null string, no valid Boolean value, no number and no array object. Read More

 Answers: Create a new object in JavaScript var obj = new Object(); //or var obj = {}; Read More

obj["age"] = 17; //or obj.age = 17; Read More

Way to append a value to an array in JavaScript arr[arr.length] = value; Read More

In JavaScript this keywork refers to the current object. Read More

The most common reason for this error is that the the machine key value in machine.config is different for each server. As a result, view state encoded by one machine cannot be decoded by another. To rectify this, edit the machine.config file on each... Read More

//select all input tags function SelectAll() { var checkboxes = document.getElementsByTagName("input"); for(i=0;i<checkboxes.length;i++) { if(checkboxes.item(i).attributes["type"].value == "checkbox") { checkboxes.item(i).checked = true; } } } Read More

script language="JavaScript" type="text/javascript" > function setBeerIcon() { var beerIcon = document.getElementById("beerIcon"); beerIcon.src = "images/"+getSelectValue(" beer")+".jpg"; } </script> <img border="0" src="" id="brandIcon"... Read More

It is perfectly legal to assign a number to a variable and then assign a string to the same variable as follows example i = 10; i = "string"; This is called variable typing Read More

No. Javascript does not have block level scope, all the variables declared inside a function possess the same level of scope unlike c, c++, java. Read More

In JavaScript === is strict equality operator ,it returns true only when the two operands are having the same value without any type conversion. Read More

<script> function favAnimal(button) { alert('You like '+button.value+'s.'); } </script> <input type="radio" name="marsupial" value="kangaroo" onchange="favAnimal(this)">Kangaroo <br /><input type=... Read More

<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]... Read More

To disable an HTML object in JavaScript use below line of code... document.getElementById("myObject").disabled = true; Read More

Changing the contents of an element is a much better solution. When the method showStatus is invoked it will change the content of the span. function showStatus(message) { var element = document.getElementById("mystatus"); element.textContent =... Read More

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Title of page</title> <script type="text/ javascript"> function addNode() { var newP = document.createElement("p"); var textNode =... Read More

<script type="text/javascript"> function pseudoHitMe() { alert("Ouch!"); } </script> <a href="javascript:pseudoHitMe()">hit me</a> Read More

<a href=" javascript.shtml" onmouseover="window.status='Hi There!';return true" onmouseout="window.status='';return true">Look at the Status bar</a> Look at the Status bar as your cursor goes over the link. Read More

These are similar to the decodeURI() and encodeURI(), but escape() is used for only portions of a URI. < script type="text/javascript"> var myvalue = "Sir Robbert Scott"; document.write("Original myvalue: "+myvalue); document.write("<... Read More

Below line will help us how to create a popup warning box in JavaScript.... alert('Warning: Please enter an integer between 0 and 100.'); Read More

Below line will help us how to create a Confirmation box in JavaScript.... confirm("Do you really want to launch the missile today. HuM?"); Read More

Below line will help us how to create a Input box in JavaScript.... prompt("What is your name?"); Read More

window.open ( "http://www.globalguideline.com", "Online Web Tutorials", "resizable=yes, " + "status=yes," + "toolbar=yes," + "location=yes," + "menubar=yes," + "scrollbars=yes," + "width=800," + "height=400" ); Read More

Values stored in cookies may not have semicolons, commas, or spaces. You should use the handy "escape()" function to encode the values, and "unescape()" to retrieve them. //Sets cookie of current value for myTextBox function TextBoxOnchange() { ... Read More

function getCookieData(labelName) { //from Danny Goodman var labelLen = labelName.length; // read cookie property only once for speed var cookieData = document.cookie; var cLen = cookieData.length; var i = 0; var cEnd; while (i < cLen) {... Read More

You can add an event handler in the HTML definition of the element like this, <script type="text/ javascript"><!-- function hitme() { alert("I've been hit!"); } // --> </script> <input type="button" id="hitme"... Read More

script type="text/javascript"> document.getElementById("hitme4").removeEventListener("click", hitme4, false); </script> Key Events "onkeydown", "onkeypress", "onkeyup" events are supported both in ie and standards-based browsers. <... Read More

Between CSS and JavaScript is a weird symmetry. CSS style rules are laid on top of the DOM. The CSS property names like "font-weight" are transliterated into "myElement.style.fontWeight". The class of an element can be swapped out. For example: ... Read More

Change the "visibility" attribute of the style object associated with your element. Remember that a hidden element still takes up space, use "display" to make the space disappear as well. if ( x == y) { myElement.style.visibility = 'visible&... Read More

Java Script, originally supported by netscape navigator, is the most popular web scripting language. Java Script lets you embed programs right in your web pages and run these programs using the web browser. With the introduction of dynamic html... Read More

In theory, we should cache the current state of the cursor and then put it back to its original state. document.body.style.cursor = 'wait'; //do something interesting and time consuming document.body.style.cursor = 'auto'; Read More

You can use several different methods of placing javascript in you pages. You can directly add a script element inside the body of page. 1. For example, to add the "last updated line" to your pages, In your page text, add the following: <p>... Read More

Java script supports most of the structured programming syntax present in ?C? language. It doesn?t support scoping which is present in C programming in block style. It also supports various forms and methods of testing the type of an object which... Read More

To reload the current web page using JavaScript use the below line of code... window.location.reload(true); Read More

Each time the outer function is invoked an inner function is created. Variables for the outer function still continue to exist as long as the inner function exists. This process continues until invocation exists. This is the how closures work within... Read More

< script language="JavaScript" type="text/javascript" > <!-- location.href="http://www.globalguideline.com"; //--> </script> Read More

If you prefix a new with a function call creates a new object and you can call that functions with a local keyword which is attached to that object. Object prototype property determines the functions prototype property. These functions act as object... Read More

We can use the parseInt() and parseFloat() methods in JavaScript to convert a string to a number or numeric value. Notice that extra letters following a valid number are ignored, which is kinda wierd but convenient at times. parseInt("100") ==>... Read More

There is no big distinction between function definition and method definition. The only difference occurs when you actually call that function as a method which inturn is attached to an object. When the function is called in this manner its local... Read More

Java script does not have a sophisticated run time of its own but it relies on the web browser of the client. It relies on this run time environment for its functions and methods to perform their duties by which scripts can interact with the user... Read More

When you use variadic function in Javascript, an indefinite number of parameters can be passed onto the function. Inturn the function can access the parameters through formal parameters and local arguments. Variadic functions are much successful... Read More

The Math object contains useful constants such as Math.PI, Math.E Math also has a zillion helpful functions in JavaScript. Math.abs(value); //absolute value Math.max(value1, value2); //find the largest Math.random() //generate a decimal... Read More

Some of the simple usages with Javascript are 1) A new pop up window can be made and changed according to the requirements such as no menus, scroll bars, etc. 2) Validation of input values submitted by the user through a web form. 3) Mouse over... Read More

Time inside a date object is stored as milliseconds since Jan 1, 1970 in JavaScript. e.g. new Date(06,01,02) // produces "Fri Feb 02 1906 00:00:00 GMT-0600 (Central Standard Time)" new Date(06,01,02).toLocaleString() // produces "Friday,... Read More

Java Script engine was first created by Netscape navigator. This engine interrupts the java script code and executes accordingly. The most common Java Script user interface is the web browser. Java script engine was created by Brendan. Read More

As JavaScript uses Web as an interface it gives an ample scope for users to transfer malicious scripts. Most of the JavaScript related breaches and wrong doings are due to sandbox or same origin policy. Read More

The "delete" operator removes an array element in JavaScript , but oddly does not change the size of the array. <script type="text/javascript"> var days = ["Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday","Saturday"]; document... Read More

Java script activities are restricted by web browsers in two ways they are. 1) First scripts run in sandbox which performs the most basic functions such as executing or running the code or script. This doesn?t allow programming activities. 2)... Read More

These are the following cases when Java Script will not function. 1) An old browser which doesn?t support DOM. 2) PDA or Mobile Phone will not execute Java Script. 3) Security reasons will not allow optimal performance of Jscript. 4) Speech... Read More

Cross site scripting raises security threats during execution and secured data transfer through web sites. It uses same origin policy. When a malicious script is made to run it discloses private information to the wrong person. This occurs... Read More

Array maps everything from an integer to Values. Objects map everything from values to integers, Javascript specialize in certain special functions through which they can include integer indicies in their behavior. Large indicies can be removed if... Read More

Java Script represents numbers in the form of IEEE-754 doubles. This form of representation provides accuracy upto 14-15 significant digits. They represent fractions but not the decimal numbers to an extent. To perform explicit numeric conversion you... Read More

Strings are represented as a sequence of characters in Javascript. Strings can be created when you place characters between double quotations or single quotations. Individual characters can be accessed by arrays. Read More

Three Boolean operators are present in Javascript they are 1) && 2) II 3) / All the operators are regarded as true unless the Javascript regards them as false. You can define these operators to make as statement false number0, null,... Read More

The eval() method is incredibly powerful allowing us to execute snippets of code during execution in JavaScript. <script type="text/javascript"> var USA_Texas_Austin = "521,289"; document.write("Population is "+eval("USA_"+"Texas_"+"Austin... Read More

Continue statement continues the current loop (if label not specified) in a new iteration whereas break statement exits the current loop in JavaScript. Read More

JavaScript Data Types are Number, String, Boolean, Function, Object, Null, Undefined Read More

Many characters cannot be sent in a URL, but must be converted to their hex encoding. These functions are used to convert an entire URI (a superset of URL) to and from a format that can be sent via a URI. <script type="text/javascript"> var... Read More

The most basic and ancient use of buttons are the " submit" and " clear" , which appear slightly before the Pleistocene period. Notice when the " GO!" button is pressed it submits itself to itself and appends the name in the URL. < form action=... Read More

ECMAScript (ECMA-262) has since June 1997 been the official scripting standard for the Web. It is documented at: http://www.ecma.ch/stand/ecma-262.htm Read More

Netscape maintains a page of JavaScript Known Bugs in its online Navigator Release Notes. Unfortunately, according to guru Danny Goodman, "this list is not complete," and we know of no definitive, well-maintained alternative. Read More

As in most object-oriented, event-driven programming languages, there are four distinct entities in JavaScript: * OBJECTS. A discussion of objects is beyond the scope of this FAQ (see the section "Objects and the Web" in Intranet Journal'... Read More

This question goes to the heart of any OOPS [Object-Oriented Programming System]. The abbreviated answer given here -- lengthy as it is -- omits important differences between the Netscape and Microsoft broswer object models, and between various... Read More

The languages have enough in common to make learning one easy if you know the other. By the same token, the differences are subtle enough to trip up those proficient in both. Here's a short list comparing C and JavaScript: * Terminating... Read More

Question : How do I ... with JavaScript/JScript ... embed JavaScript in a web page?                  Answers: <SCRIPT LANGUAGE="JavaScript"> <!-- hide script from older... Read More

Question : How do I ... with JavaScript/JScript ... use the same variable name several times in a script?             Answers: By default all variables in JavaScript are global, meaning they retain... Read More

Question : How do I ... with JavaScript/JScript ... use quotation marks when scripting?      Answers: There are two types of quote mark in JavaScript, the single-quote (') and double-quote ("). Either can be used to... Read More

Question : How do I ... with JavaScript/JScript ... submit forms by e-mail         Answers: The most reliable way is to use straight HTML via a Submit style button. Set the ACTION of the <FORM> to a mailto... Read More

At best, a client-side script can show the visitor how many she has been to the site (storing the count in a local cookie). A count of total hits to the server requires a server-side program. Read More

Number, String, Boolean, Function, Object, Null, Undefined. Read More

Return true if the argument is not a number. Read More

 var obj = new Object(); or var obj = {}; Read More

It is perfectly legal to assign a number to a variable and then assign a string to the same variable as follows example i = 10; i = "string"; This is called variable typing Read More

ocument.bgcolor property can be set to any appropriate color. Read More

This can be achieved by using the following tag between head tags or between body tags. <script src="abc.js"></script> where abc.js is the external javscript file to be accessed. Read More

Use the below specified style of comments <script language=javascript> <!-- javascript code goes here // --> Read More

Number.MAX_VALUE Number.MIN_VALUE Read More

Java Script is object based language it is used for front end validations. java is object oriented language object oriented language supports OOP?s Object based not suppoted inheritence. Read More

Include the name of the frame in the target attribute of the hyperlink. <a href=?mypage.htm? target=?myframe?>>My Page</a> Read More