Ajax interview Questions
1)What's AJAX?
2)How Ajax is Different
3)Who’s Using Ajax
4)Should I consider AJAX?
5)Does AJAX work with Java?
6)Won't my server-side framework provide me with AJAX?
7)Where should I start?
Showing posts with label ajax interview faqs. Show all posts
Showing posts with label ajax interview faqs. Show all posts
What is AJAX?
What is AJAX?
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 Maps hit the streets.
Asynchronous JavaScript and XML, or Ajax (pronounced "Aye-Jacks"), is a web development technique for creating interactive web applications using a combination of XHTML (or HTML) and CSS for marking up and styling information. (XML is commonly used, although any format will work, including preformatted HTML, plain text, JSON and even EBML).
The Document Object Model manipulated through JavaScript to dynamically display and interact with the information presented The XMLHttpRequest object to exchange data asynchronously with the web server. In some Ajax frameworks and in some situations, an IFrame object is used instead of the XMLHttpRequest object to exchange data with the web server. Like DHTML, LAMP, or SPA, Ajax is not a technology in itself, but a term that refers to the use of a group of technologies together. In fact, derivative/composite technologies based substantially upon Ajax, such as AFLAX, are already appearing. Ajax applications are mostly executed on the user's computer; they can perform a number of tasks without their performance being limited by the network. This permits the development of interactive applications, in particular reactive and rich graphic user interfaces.
Ajax applications target a well-documented platform, implemented by all major browsers on most existing platforms. While it is uncertain that this compatibility will resist the advent of the next generations of browsers (in particular, Firefox), at the moment, Ajax applications are effectively cross-platform.
While the Ajax platform is more restricted than the Java platform, current Ajax applications effectively fill part of the one-time niche of Java applets: extending the browser with portable, lightweight mini-applications.
Ajax isn't a technology. It's really several technologies, each flourishing in its own right, coming together in powerful new ways. Ajax incorporates:
* Standards-based presentation using XHTML and CSS
* Dynamic display and interaction using the Document Object Model
* Data interchange and manipulation using XML and XSLT
* asynchronous data retrieval using XMLHttpRequest and
* JavaScript binding everything together.
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 Maps hit the streets.
Asynchronous JavaScript and XML, or Ajax (pronounced "Aye-Jacks"), is a web development technique for creating interactive web applications using a combination of XHTML (or HTML) and CSS for marking up and styling information. (XML is commonly used, although any format will work, including preformatted HTML, plain text, JSON and even EBML).
The Document Object Model manipulated through JavaScript to dynamically display and interact with the information presented The XMLHttpRequest object to exchange data asynchronously with the web server. In some Ajax frameworks and in some situations, an IFrame object is used instead of the XMLHttpRequest object to exchange data with the web server. Like DHTML, LAMP, or SPA, Ajax is not a technology in itself, but a term that refers to the use of a group of technologies together. In fact, derivative/composite technologies based substantially upon Ajax, such as AFLAX, are already appearing. Ajax applications are mostly executed on the user's computer; they can perform a number of tasks without their performance being limited by the network. This permits the development of interactive applications, in particular reactive and rich graphic user interfaces.
Ajax applications target a well-documented platform, implemented by all major browsers on most existing platforms. While it is uncertain that this compatibility will resist the advent of the next generations of browsers (in particular, Firefox), at the moment, Ajax applications are effectively cross-platform.
While the Ajax platform is more restricted than the Java platform, current Ajax applications effectively fill part of the one-time niche of Java applets: extending the browser with portable, lightweight mini-applications.
Ajax isn't a technology. It's really several technologies, each flourishing in its own right, coming together in powerful new ways. Ajax incorporates:
* Standards-based presentation using XHTML and CSS
* Dynamic display and interaction using the Document Object Model
* Data interchange and manipulation using XML and XSLT
* asynchronous data retrieval using XMLHttpRequest and
* JavaScript binding everything together.
Explain about the getElementsByTagName and parseResults function in Ajax
Explain about the getElementsByTagName and parseResults function in Ajax
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 retrieve the data. With parseResultsfunction you can get the next element in the array and assign it to the local property.
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 retrieve the data. With parseResultsfunction you can get the next element in the array and assign it to the local property.
Explain about clearPreviousResults in Ajax
Explain about clearPreviousResults in Ajax
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 table displaying the search results. Any results rows are child nodes of the tbody node.
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 table displaying the search results. Any results rows are child nodes of the tbody node.
Explain about security of the Ajax based web applications?
Explain about security of the Ajax based web applications?
The XMLHttpRequest object is subjected to the browsers security sandbox. Any resources requested by the XMLHttpRequest object must reside within the same domain from which the calling script originated from which the calling script requested. XMLHttpRequest cannot request services due to security restriction, outside the domain from which the script was originally served.
The XMLHttpRequest object is subjected to the browsers security sandbox. Any resources requested by the XMLHttpRequest object must reside within the same domain from which the calling script originated from which the calling script requested. XMLHttpRequest cannot request services due to security restriction, outside the domain from which the script was originally served.
Difference between GET and POST in ajax
Difference between GET and POST in ajax
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 anytime you are changing the state on the server with a GET call. In POST you are required to set the content-Type header on the XMLHttpRequest.
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 anytime you are changing the state on the server with a GET call. In POST you are required to set the content-Type header on the XMLHttpRequest.
Disadvantage of ajax related to browser integration?
Disadvantage of ajax related to browser integration?
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 in its state. User can maintain the applications as the state of the application changes
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 in its state. User can maintain the applications as the state of the application changes
What does an ajax component frameworks provides?
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 with less control.
Cusomization Applications, skinning facilities, extensibility and programmatic control.
These functions are very rich in application but they are a bit slower in execution with less control.
Explain about direct ajax frameworks?
Explain about direct ajax frameworks?
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), event handling, DOM, and altering graphic rich elements. These frameworks are used for shopping frameworks but not for web based applications.
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), event handling, DOM, and altering graphic rich elements. These frameworks are used for shopping frameworks but not for web based applications.
Multimedia functions of Ajax
Multimedia functions of Ajax
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 hack. These multimedia functions can be obtained from outside which helps in building excellent applications.
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 hack. These multimedia functions can be obtained from outside which helps in building excellent applications.
Explain about web analytics problem with Java?
Explain about web analytics problem with Java?
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 process of indexing because it is unable to track new content addition.
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 process of indexing because it is unable to track new content addition.
How friendly Ajax is with SEO?
How friendly Ajax is with SEO?
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 not index Javascript present in web pages. Careful indexing should be done where there is dynamic data and presence of javascript.
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 not index Javascript present in web pages. Careful indexing should be done where there is dynamic data and presence of javascript.
If there is an input in the text field what are all the functions which get executed in Ajax
If there is an input in the text field what are all the functions which get executed in Ajax
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 the cache.
4) When a change is triggered statechange is executed
5) An XMLHTTP object with a given URL gets executed
6) A request to the server is sent through HTTP.
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 the cache.
4) When a change is triggered statechange is executed
5) An XMLHTTP object with a given URL gets executed
6) A request to the server is sent through HTTP.
Explain about sending a request to the server in ajax
Explain about sending a request to the server in ajax
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 the server side script. The third argument or request determines how the request should be handled whether asynchronously or not. Send () method is useful to send a request to the server to determine functionality.
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 the server side script. The third argument or request determines how the request should be handled whether asynchronously or not. Send () method is useful to send a request to the server to determine functionality.
Readystate property in Ajax
Readystate property in Ajax
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 if the status is zero the request is not initialized, 1 the request has been set up, 2 the request has been sent, 3 the request is in process, 4 the request is complete.
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 if the status is zero the request is not initialized, 1 the request has been set up, 2 the request has been sent, 3 the request is in process, 4 the request is complete.
Onreadystatechange property in Ajax
Onreadystatechange property in Ajax
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 efficiency of the process.
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 efficiency of the process.
Response time when we are using Ajax?
Response time when we are using Ajax?
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 delays between the client and server request.
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 delays between the client and server request.
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