Latest Technical Interview Answers - 11

Latest Technical Interview Answers - 11

What is AJAXanywhere?
Posted:
AJAX stands for Asynchronous Java Script and XMLHttpRequest, which will send a a request in an asynchronous way will sends the some part of data and receive the part of data what your request for.. Instead of refreshing whole page sends some parts of data and receives as the part of data you required

What does AJAX stand for?
Posted:
AJAX stands for Asynchronous JavaScript And XML.

How many types of ready states in ajax ?
Posted:
5 readyStates 0 = uninitialized 1 = loading 2 = loaded 3 = interactive 4 = complete

What exactly is the W3C DOM?
Posted:
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…

How to make a XMLHTTPRequest ?
Posted:
By two ways one For Internet Explorer and second one with other broswers Syntax for this is var httpRequest; if(window.XMLHttpRequest) { httpRequest = new XMLHttpRequest(); } else if (window.ActiveXObject) { // IE httpRequest = new ActiveXObject(’Microsoft.XMLHTTP’); } .

Which browsers support AJAX?
Posted:
Internet Explorer 5.0 and up, Opera 7.6 and up, Netscape 7.1 and up, Firefox 1.0 and up, Safari 1.2 and up, among others. What is the role of Ajax in enhancing user experience? AJAX is not a new technology but a combination of several existing technologies in a new way. These include HTML, CSS, DOM, XML, XSLT, [...]

What are the different frameworks available In AJAX?
Posted:
A good framework is “Zephyr”. It is used with php and seems to be very easy to use. Prototype.JS Framework is available with detailed documentation, its very easy to handle AJAX and JavaScript, Introduce $ concept its very simple, For Ajax specially u don’t need to check cross broswer, Open, Close and error handling through [...]

Who invented AJAX?
Posted:
Microsoft first implemented the XMLHTTPRequest object in Internet Explorer 5 for Windows as an ActiveX object. It is the term coined after this support. Asynchronous javascript and XML. Nobody invented AJAX, Jesse James Garrett of Adaptive Path coined the phrase early 2005 - but the tech was already in place much earlier than that.

Does Java have support for Comet style server-side push?
Posted:
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 event based low latency server side push for AJAX applications. Comet communication keeps one of the two connections [...]

Are there any security issues with AJAX?
Posted:
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 the page was loaded. A proxy pattern could be used for AJAX interactions with external [...]

Should I use an HTTP GET or POST for my AJAX calls?
Posted:
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 highly recommended for a consistent web application architecture

Does AJAX work with Java?
Posted:
Yes, 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. The JavaServer Faces component model is a great fit for defining and using AJAX [...]

What is AJAX?
Posted:
Ajax is an acronym for “Asynchronous JavaScript And XML.” Web pages are endowed with snippets of code that can access remote services (like web services) and not refresh the page. This prevents “round tripping” which is the cause for display flicker and slow response times.

How to we create an XmlHttpRequest object for Internet Explorer? How is this different for other browsers?
Posted:
For Internet Explorer, an ActiveXObject is used for declaring an XmlHttpRequest object in Javascript. //Code as below for IE: xmlHttpObject = new ActiveXObject(”Msxml2.XMLHTTP”); //For Other browsers, code as below: xmlHttpObject = new XMLHttpRequest(); Note that XmlHttpObject used above is simply a variable that holds the XmlHttpRequest object for the respective browsers.

What are the properties of the XmlHttpRequest object? What are the different types of readyStates in Ajax?
Posted:
i) onreadyStateChange - This function is used to process the reply from the web server. ii) readyState - This property holds the response status of the web server. There are 5 states: 0 - request not yet initialized 1 - request now set 2 - request sent 3 - request processing 4 - request completes iii) responseText - Has the data sent [...]

What is the ASP.NET Ajax Framework? What versions have been released so far?
Posted:
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 - Support for all modern browsers 3 - Access remote services and data from the browser without tons of complicated [...]

What are Ajax Extensions?
Posted:
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 run with ASP.NET 2.0 The new ASP.NET 3.5 Framework comes with the Ajax Library 3.5 (containing the Ajax [...]

What is the ASP.NET Control Toolkit?
Posted:
Besides the Ajax Framework (which is the Ajax engine) and Ajax Extensions (which contain the default Ajax controls), there is a toolkit called the Ajax Control Toolkit available for use & download (for free). This is a collection of rich featured, highly interactive controls, created as a joint venture between Microsoft & the Developer Community.

What is AJAXanywhere?
Posted:
AJAX stands for Asynchronous Java Script and XMLHttpRequest, which will send a a request in an asynchronous way will sends the some part of data and receive the part of data what your request for.. Instead of refreshing whole page sends some parts of data and receives as the part of data you required
What does AJAX stand for?
Posted:
AJAX stands for Asynchronous JavaScript And XML.
How many types of ready states in ajax ?
Posted:
5 readyStates 0 = uninitialized 1 = loading 2 = loaded 3 = interactive 4 = complete
What exactly is the W3C DOM?
Posted:
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…
How to make a XMLHTTPRequest ?
Posted:
By two ways one For Internet Explorer and second one with other broswers Syntax for this is var httpRequest; if(window.XMLHttpRequest) { httpRequest = new XMLHttpRequest(); } else if (window.ActiveXObject) { // IE httpRequest = new ActiveXObject(’Microsoft.XMLHTTP’); } .
Which browsers support AJAX?
Posted:
Internet Explorer 5.0 and up, Opera 7.6 and up, Netscape 7.1 and up, Firefox 1.0 and up, Safari 1.2 and up, among others. What is the role of Ajax in enhancing user experience? AJAX is not a new technology but a combination of several existing technologies in a new way. These include HTML, CSS, DOM, XML, XSLT, [...]
What are the different frameworks available In AJAX?
Posted:
A good framework is “Zephyr”. It is used with php and seems to be very easy to use. Prototype.JS Framework is available with detailed documentation, its very easy to handle AJAX and JavaScript, Introduce $ concept its very simple, For Ajax specially u don’t need to check cross broswer, Open, Close and error handling through [...]
Who invented AJAX?
Posted:
Microsoft first implemented the XMLHTTPRequest object in Internet Explorer 5 for Windows as an ActiveX object. It is the term coined after this support. Asynchronous javascript and XML. Nobody invented AJAX, Jesse James Garrett of Adaptive Path coined the phrase early 2005 - but the tech was already in place much earlier than that.
Does Java have support for Comet style server-side push?
Posted:
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 event based low latency server side push for AJAX applications. Comet communication keeps one of the two connections [...]
Are there any security issues with AJAX?
Posted:
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 the page was loaded. A proxy pattern could be used for AJAX interactions with external [...]
Should I use an HTTP GET or POST for my AJAX calls?
Posted:
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 highly recommended for a consistent web application architecture
Does AJAX work with Java?
Posted:
Yes, 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. The JavaServer Faces component model is a great fit for defining and using AJAX [...]
What is AJAX?
Posted:
Ajax is an acronym for “Asynchronous JavaScript And XML.” Web pages are endowed with snippets of code that can access remote services (like web services) and not refresh the page. This prevents “round tripping” which is the cause for display flicker and slow response times.
How to we create an XmlHttpRequest object for Internet Explorer? How is this different for other browsers?
Posted:
For Internet Explorer, an ActiveXObject is used for declaring an XmlHttpRequest object in Javascript. //Code as below for IE: xmlHttpObject = new ActiveXObject(”Msxml2.XMLHTTP”); //For Other browsers, code as below: xmlHttpObject = new XMLHttpRequest(); Note that XmlHttpObject used above is simply a variable that holds the XmlHttpRequest object for the respective browsers.
What are the properties of the XmlHttpRequest object? What are the different types of readyStates in Ajax?
Posted:
i) onreadyStateChange - This function is used to process the reply from the web server. ii) readyState - This property holds the response status of the web server. There are 5 states: 0 - request not yet initialized 1 - request now set 2 - request sent 3 - request processing 4 - request completes iii) responseText - Has the data sent [...]
What is the ASP.NET Ajax Framework? What versions have been released so far?
Posted:
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 - Support for all modern browsers 3 - Access remote services and data from the browser without tons of complicated [...]
What are Ajax Extensions?
Posted:
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 run with ASP.NET 2.0 The new ASP.NET 3.5 Framework comes with the Ajax Library 3.5 (containing the Ajax [...]
What is the ASP.NET Control Toolkit?
Posted:
Besides the Ajax Framework (which is the Ajax engine) and Ajax Extensions (which contain the default Ajax controls), there is a toolkit called the Ajax Control Toolkit available for use & download (for free). This is a collection of rich featured, highly interactive controls, created as a joint venture between Microsoft & the Developer Community.
What is Dojo?
Posted:
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 sometimes as a “unified” toolkit. Dojo aims to solve some long-standing historical problems with DHTML which prevented [...]

How to handle multiple or concurrent requests in Ajax?
Posted:
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 another table (say table2) at the same time, use xmlHttpObject2.Onreadystatechange = functionfromTable2(); Ofcourse, the XmlHttpObject needs to be opened & parameters passed too, like as [...]