You would use GET when the request is idempotent, meaning that multiple requests generate the same result. In general use GET to retrieve data from the server, in other words try to change the state on the server with a GET call. Use POST methods... Read More

Dojo is a third-party javascript toolkit for creating rich featured applications. Dojo is an Open Source DHTML toolkit written in JavaScript. It builds on several contributed code bases (nWidgets, Burstlib, f(m)), which is why we refer to it... Read More

It depends. Clearly the 'X' in AJAX stands for XML, but several AJAX proponents are quick to point out that nothing in AJAX, per se, precludes using other types of payload, such as, JavaScript, HTML, or plain text. * XML - Web... Read More

Using Visual Studio Web Developer Express 2005 & versions above it, Ajax based applications may easily be created. Note that the Ajax Framework & Ajax Extensions should be installed (In case of VS 2005). If using Visual Studio 2008 Web... Read More

For concurrent requests, declare separate XmlHttpRequest objects for each request. For example, for request to get data from an SQL table1, use something like this... xmlHttpObject1.Onreadystatechange = functionfromTable1(); and to get data from... 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

Internet Explorer 5.0 and above, Opera 7.6 and above, Netscape 7.1 and above, Firefox 1.0 and above, Safari 1.2 and above, among others. Read More

When creating a form make sure that the "form" element "onSubmit" attribute is set to a JavaScript function that returns false. <form onSubmit="doAJAXSubmit();return false;" > <input type="text" id="tf1" /> <input type="submit" id=... Read More

i) onreadyStateChange - This function is used to process the reply from the web server.<br>ii) readyState - This property holds the response status of the web server. There are 5 states:<br>1 - request not yet initialized<br>2 -... Read More

ASP.NET AJAX is a free framework to implement Ajax in asp.net web applications, for quickly creating efficient and interactive Web applications that work across all popular browsers. The Ajax Framework is powered with 1 - Reusable Ajax Controls 2 -... Read More

Yes. But this has to be done before the init event of the page (or during runtime after the page has already loaded). Otherwise an InvalidOperationException will be thrown. Read More

No. It is not possible to use multiple ScriptManager control in a web page. In fact, any such requirement never comes in because a single ScriptManager control is enough to handle the objects of a web page. Read More

An Ajax Web Application tends to confused end users if the network bandwidth is slow, because there is no full postback running. However, this confusion may be eliminated by using an UpdateProgress control in tandem. Read More

Proxied calls are made through stub objects that mimic your PHP classes on the JavaScript side. E.g., the helloworld class from the Hello World example. Proxyless calls are made using utility javascript functions like HTML_AJAX.replace() and... Read More

With JavaScript you can have more than one AJAX request processing at a single time. In order to insure the proper post processing of code it is recommended that you use JavaScript Closures. The example below shows an XMLHttpRequest object... Read More

It depends. With AJAX the answer is more in between. Control can be more centralized in a server-side component or as a mix of client-side and server-side controllers. * Centralized server-side controller - When having a more centralized... Read More

I too am having issues producing good load test data with our new AJAX app. Has anyone at least used WinRunner or QTP Read More

SAjax, NAjax, FAjax. All of them are ok, but it it best to make your own to suit your needs Read More

For Internet Explorer, an ActiveXObject is used for declaring an XmlHttpRequest object in Javascript.<br>//Code as below for IE:<br>xmlHttpObject = new ActiveXObject("Msxml2.XMLHTTP");<br>//For Other browsers, code as below:<br... Read More

No answer available currently. Be the first one to reply to this question by submitting your answer from the form below.   Read More

Depending upon the browser... if (window.ActiveXObject) { // Internet Explorer http_request = new ActiveXObject("Microsoft.XMLHTTP"); } else if... Read More

The ASP.NET Ajax Extensions are set of Ajax-based controls that work in ASP.NET 2 (or above) based applications. Ofcourse,they also need the Ajax runtime which is actually the Ajax Framework 1.0. ASP.NET Ajax Extensions 1.0 have to be downloaded to... Read More

For all three, a script element is rendered after the opening form tag. Following are the differences: 1 - RegisterClientScriptBlock - The script is specified as a string parameter. 2 - RegisterClientScriptInclude - The script content is... Read More

When a script is registered by the ScriptManager class, a type/key pair is created to uniquely identify the script. For identification purposes, the type/key pair name is always unique for dentifying a script. Hence, there may be no duplication in... Read More

An UpdatePanel control is a holder for server side controls that need to be partial postbacked in an ajax cycle. All controls residing inside the UpdatePanel will be partial postbacked. Below is a small example of using an UpdatePanel. As you see... Read More

No. Or not yet. It is part of the DOM Level 3 Load and Save Specification proposal. Read More

Use the ScriptManager's AsyncPostBackTimeout Property. For example, if you want to debug a web page but you get an error that the page request has timed out, you may set where the value specified is in seconds. Read More

JavaScript does not have threads. JavaScript functions are called when an event happens in a page such as the page is loaded, a mouse click, or a form element gains focus. You can create a timer using the setTimeout which takes a function name and... Read More

Ajax has culmination of languages such as asynchronous java script and XML. This has interrelated web development languages which help in creating outstanding web pages. This language is used in increasing server?s responsiveness due to client... Read More

Current AJAX applications use polling to communicate changes data between the server and client. Some applications, such as chat applications, stock tickers, or score boards require more immediate notifications of updates to the client. Comet is an... Read More

Some of the languages which are used in the combination of the webpage are. 1) Javascript will be present on the client browser 2) For client to server combinations following languages are used such as standard HTTP and XMLHTTP. 3) Server side... Read More

From your JavaScript clients you can access data in other domains if the return data is provide in JSON format. In essence you can create a JavaScript client that runs operates using data from a different server. This technique is know as JSON with... Read More

Does Ajax have significant accessibility or browser compatibility limitations? Do Ajax applications break the back button? Is Ajax compatible with REST? Are there security considerations with Ajax development? Can Ajax applications be made to work... Read More

Response time is also known as latency which can be described as the time taken or interval between the time taken to process the request generated from the client on the server. Proper handling of the XMLHttprequestobject might be the cause for some... Read More

It offers a non-blocking way for JavaScript to communicate back to the web server to update only part of the web page. Read More

Onreadystatechange property is very useful in Ajax. It stores information received from the client. It stores the function which can process the request generated from the client side in the server thereby reducing the time lag and increasing the... Read More

While components of AJAX have been around for some time (for instance, 1999 for XMLHttpRequest), it really didn't become that popular until Google took... Read More

Make use of ScriptManager.IsInAsyncPostBack property (returns a boolean value) Read More

Readystate property holds the response of the server to the query generated from the client side. Each time the readystate property changes onreadystatechange function will be executed. Some of the values for the readystate property are as follows... Read More

Not at all. Macromedia is an Adaptive Path client, and we?ve long been supporters of Flash technology. As Ajax matures, we expect that sometimes Ajax will be the better solution to a particular problem, and sometimes Flash will be the better solution... Read More

We don?t know yet. Because this is a relatively new approach, our understanding of where Ajax can best be applied is still in its infancy. Sometimes the traditional web application model is the most appropriate solution to a problem. Read More

It's not possible to set any session variables directly from javascript as it is purely a client side technology. You can use AJAX though to asyncronously...<br><br>Cannot parse XML generated by JSP I am generating an XML using... Read More

To send a request to the server we should use the open () and send () method. Open() method has three arguments of which the first one defines which method to use which would help in sending the request. The second argument explains about the URL of... Read More

Applets provide a rich experience on the client side and there are many things they can do that an AJAX application cannot do, such as custom data streaming, graphic manipulation, threading, and advanced GUIs. While DHTML with the use of AJAX has... Read More

If you plan not to reuse and existing AJAX component here are some of the things you will need to know.<br>Plan to learn Dynamic HTML (DHTML), the technology that is the foundation for AJAX. DHTML enables browser-base real time interaction... Read More

Not totally. Most browsers offer a native XMLHttpRequest JavaScript object, while another one (Internet Explorer) require you to get it as an ActiveX object.... Read More

The following functions are executed when there is an input in the text field. 1) Defines the url which we should be sent to the server 2) A parameter is added to the content of the input field. 3) A parameter is added to prevent the server from... Read More

Not necessarily. Ajax gives interaction designers more flexibility. However, the more power we have, the more caution we must use in exercising it. We must be careful to use Ajax to enhance the user experience of our applications, not degrade it. Read More

Ajax is a combination of many languages and it is not so friendly with search engine indexing because it uses Javascript for much part of its code. This problem occurs with websites which have dynamic data present in it. Search engines generally do... Read More

There are many libraries/frameworks out there (and many more emerging) that will help abstract such things as all the nasty browser differences. Three good libraries are The Dojo Toolkit, Prototype, and DWR.<br><br>* The Dojo Toolkit... Read More

Many search engines load a new page whenever new or updated content is loaded in the website. Whenever there is a check out or content updation websites load giving the scope for search engines to index the new content or updation. Ajax alters the... Read More

Ajax lacks built in multimedia functions. It is not so supportive of inbuilt applications but uses other browser functionalities and plugin`s such as SVG, Quicktime and flash pugin. General multimedia for ajax is achieved through mashup and... Read More

There are several browser-side frameworks available, each with their own uniqueness. Read More

AJAX requests should use an HTTP GET request when retrieving data where the data will not change for a given request URL. An HTTP POST should be used when state is updated on the server. This is in line with HTTP idempotency recommendations and is... Read More

Direct ajax frameworks require CSS, HTML and ajax expertise. Authoring should be done in HTML and framework directly deals with HTML elements. Many of the frameworks and API`s are provided are many purposes such as commonly including functions (COM),... Read More

There are not that many tools out there that will support both client-side and server-side debugging. I am certain this will change as AJAX applications proliferate. I currently do my client-side and server-side debugging separately. Below is some... Read More

The following features are provided for ajax component frameworks. They are Cusomization Applications, skinning facilities, extensibility and programmatic control. These functions are very rich in application but they are a bit slower in execution... Read More

Just because you are using XML does not mean you can properly send and receive localized content using AJAX requests. To provide internationalized AJAX components you need to do the following: * Set the charset of the page to an encoding that is... Read More

Dynamically created pages created by ajax does not support back button which takes the user to the previous pages. There are various solutions to this problem out of which one solution is to use iframes. Also users can bookmark a certain application... Read More

No. XML is the most fully-developed means of getting data in and out of an Ajax client, but there?s no reason you couldn?t accomplish the same effects using a technology like JavaScript Object Notation or any similar means of structuring data for... Read More

Not necessarily. Ajax applications inevitably involve running complex JavaScript code on the client. Making that complex code efficient and bug-free is not a task to be taken lightly, and better development tools and frameworks will be needed to help... Read More

The clearPreviousResults function performs two tasks removing the results header task that appears at the top and clearing any rows from the results table. The nest task is to clearPreviousResults is to delete any rows that may already be in the... Read More

You use the tag method to retrieve all the property elements in the XML document as an array and assign the array to the local variable properties. Once you have the array of property elements you can iterate over each element in the array and... Read More

The "Content-Type" header needs to be set to"text/xml". In servlets this may be done using the HttpServletResponse.setContentType()should be set to "text/xml" when the return type is XML. Many XMLHttpRequest implementations will result in an error if... Read More

From your JavaScript clients you can access data in other domains if the return data is provide in JSON format. In essence you can create a JavaScript client that runs operates using data from a different server. This technique is know as JSON with... Read More

HTML_AJAX hasn't had a stable release yet and the pear installer doesn't install non stable packages by default unless you specify a version. Read More

There is a port of JUnit for client-side JavaScript called JsUnit Read More

The W3C Document Object Model (DOM) is defined by the W3C as the following: The Document Object Model is a platform- and language-neutral interface... Read More

AJAX (Asynchronous JavaScript and XML) is a newly coined term for two powerful browser features that have been around for years, but were overlooked by many web developers until recently when applications such as Gmail, Google Suggest, and Google... Read More

Once all the major features are complete and the API has been tested, the roadmap gives an idea of whats left to be done. Read More

We don't have a list right now, but most of the API is stable as of 0.3.0. There should be no major changes at this point, though there will be lots of new additions. Read More

Good question. They don't call it AJAX for nothing! A synchronous request would block in page event processing and I don't see many use cases where a synchronous request is preferable. Read More

As of 0.3.0, all the examples that ship with HTML_AJAX have been verified to work with * Firefox 1.0+ * Internet Explorer 5.5+ (5.0 should work but it hasn't been tested) Most things work with * Safari 2+ * Opera 8.5+ Read More

Applets provide a rich experience on the client side and there are many things they can do that an AJAX application cannot do, such as custom data streaming, graphic manipulation, threading, and advanced GUIs. While DHTML with the use of AJAX has... Read More

Ajax Interview Questions and Answers Is the server or the client in control? It depends. With AJAX the answer is more in between. Control can be more centralized in a server-side component or as a mix of client-side and server-side controllers. *... Read More

No. XMLHttpRequest is only part of the Ajax equation. XMLHttpRequest is the technical component that makes the asynchronous server communication possible; Ajax is our name for the overall approach described in the article, which relies not only on... Read More

Google is making a huge investment in developing the Ajax approach. All of the major products Google has introduced over the last year ? Orkut, Gmail, the latest beta version of Google Groups, Google Suggest, and Google Maps ? are Ajax... Read More

The oldest PHP version i've fully tested HTML_AJAX is 4.3.11, but it should run on 4.2.0 without any problems. (Testing reports from PHP versions older then 4.3.11 would be appreciated.) Read More

If you run into an HTML_AJAX problem only on some servers, chances are your running into a problem with output compression. If the output compression is handled in the PHP config we detect that and do the right thing, but if its done from an apache... Read More

HTML_AJAX doesn't have specific plans to integrate with other JavaScript libraries. Part of this is because external dependencies make for a more complicated installation process. It might make sense to offer some optional dependencies on a... Read More

If you run into an HTML_AJAX problem only on some servers, chances are your running into a problem with output compression. If the output compression is handled in the PHP config we detect that and do the right thing, but if its done from an apache... Read More

You may be benefiting from AJAX already. Many existing Java based frameworks already have some level of AJAX interactions and new frameworks and component libraries are being developed to provide better AJAX support. I won't list all the Java... Read More

JavaScript is in plain view to the user with by selecting view source of the page. JavaScript can not access the local filesystem without the user's permission. An AJAX interaction can only be made with the servers-side component from which... Read More

If you plan not to reuse and existing AJAX component here are some of the things you will need to know. Plan to learn Dynamic HTML (DHTML), the technology that is the foundation for AJAX. DHTML enables browser-base realtime interaction between a... Read More

The W3C Document Object Model (DOM) is defined by the W3C as the following: The Document Object Model is a platform- and language-neutral interface. Read More

Don't be too quick to dump your plugin or applet based portions of your application. While AJAX and DHTML can do drag and drop and other advanced user interfaces there still limitations especially when it comes to browser support.... Read More

Proxied calls are made through stub objects that mimic your PHP classes on the JavaScript side in AJAX. E.g., the helloworld class from the Hello World example. Proxyless calls are made using utility JavaScript functions like HTML_AJAX.replace() and... Read More

What?s new is the prominent use of these techniques in real-world applications to change the fundamental interaction model of the Web. Ajax is taking hold now because these technologies and the industry?s understanding of how to deploy them most... Read More

It offers a non-blocking way for JavaScript to communicate back to the web server to update only part of the web page. Read More

It?s both. Ajax is a set of technologies being used together in a particular way. Read More

There are many libraries/frameworks out there (and many more emerging) that will help abstract such things as all the nasty browser differences. Three good libraries are The Dojo Toolkit, Prototype, and DWR. * The Dojo Toolkit contains APIs and... Read More

While you could go out and create a custom solution that tracks the current state on your application I recommend you leave this to the experts. Dojo addresses the navigation in a browser neutral way as can be seen in the JavaScript example below. ... Read More

Don't be too quick to dump your plugin or applet based portions of your application. While AJAX and DHTML can do drag and drop and other advanced user interfaces there still limitations especially when it comes to browser support. Plugins... Read More

While it may appear that images are being sent when using AJAX with an application like Google Maps what is really happening is that the URLs of images are being send as the response of an AJAX request and those URLs are being set using DHTML. In... Read More

An Ajax application eliminates the start-stop-start-stop nature of interaction on the Web by introducing an intermediary ? an Ajax engine ? between the user and the server. It seems like adding a layer to the application would make it less responsive... Read More

Just call the abort() method on the request to abort the current XMLHttpRequest in AJAX. Read More

JavaScript does not have threads. JavaScript functions are called when an event happens in a page such as the page is loaded, a mouse click, or a form element gains focus. You can create a timer using the setTimeout which takes a function name and... Read More

Depending upon the browser... if (window.ActiveXObject) { // Internet Explorer http_request = new ActiveXObject("Microsoft.XMLHTTP"); } else if. Read More

With JavaScript you can have more than one AJAX request processing at a single time. In order to insure the proper post processing of code it is recommended that you use JavaScript Closures. The example below shows an XMLHttpRequest object... Read More

HTML_AJAX doesn't have specific plans to integrate with other JavaScript libraries. Part of this is because external dependencies make for a more complicated installation process. It might make sense to offer some optional dependencies on a... Read More

Ajax isn?t something you can download. It?s an approach ? a way of thinking about the architecture of web applications using certain technologies. Neither the Ajax name nor the approach are proprietary to Adaptive Path. Read More

It?s both. Ajax is a set of technologies being used together in a particular way. Read More

XAJAX uses XML as a transport for data between the webpage and server, and you don't write your own javascript data handlers to manipulate the data received from the server. Instead you use a php class and built in javascript methods, a... Read More

AJAX definitely has the buzz right now, but it might not be the right thing for you. AJAX is limited to the latest browsers, exposes browser compatibility issues, and requires new skill-sets for many. There is a good blog entry by Alex Bosworth on... Read More

What?s new is the prominent use of these techniques in real-world applications to change the fundamental interaction model of the Web. Ajax is taking hold now because these technologies and the industry?s understanding of how to deploy them most... Read More

Absolutely. Java is a great fit for AJAX! You can use Java Enterprise Edition servers to generate AJAX client pages and to serve incoming AJAX requests, manage server side state for AJAX clients, and connect AJAX clients to your enterprise resources.... Read More

JavaScript is in plain view to the user with by selecting view source of the page. JavaScript can not access the local file system without the user's permission. An AJAX interaction can only be made with the servers-side component from which the... Read More

The nature of updating a page dynamically using data retrieved via AJAX interactions and DHTML may result in drastically changing the appearance and state of a page. A user might choose to use the browser's back or forward buttons, bookmark a... Read More

See http://ajax.schwarz-interactive.de/ for a free AJAX implementation for the .NET Framework Read More

This is working code, it might help you. if (!isIE) xmldoc = req.responseXML; else { //IE does not take the responseXML as. Read More

Neither Adaptive Path nor Google invented Ajax. Google?s recent products are simply the highest-profile examples of Ajax applications. Adaptive Path was not involved in the development of Google?s Ajax applications, but we have been doing Ajax work... Read More

Yes. This is possible using remote scripts. Read More

Yes, AJAX is a technology independent of web server the web application is hosted on. Ajax is a client (browser) technology. Read More

Colgate - Palmolive in 1947, of couse!Oh - coding? Jesse James coined the phrase early 2005 - but the tech was already in place much earlier than that. See - http://en.wikipedia.org/wiki/Ajax_%28programming%29 Read More

As i have been assigned for implementing Ajax in existing Complex JSF application, my conclusion is to go for frameworks and tools if you are planning to build a fresh application. otherwise just apply trics for incorporating ajax features. the... Read More

Internet Explorer 5.0+, Safari 1.2, Mozilla 1.0/Firefox, Opera 8.0 +, Netscape 7 Read More

There are not that many tools out there that will support both client-side and server-side debugging. I am certain this will change as AJAX applications proliferate. I currently do my client-side and server-side debugging separately. Below is... Read More