Monday, 21 September 2015

Common AJAX Interview Questions and Answers pdf

46. What is the difference between proxied and proxyless calls in AJAX?
Proxied calls are made through stub objects which can be called from PHP classes on the JavaScript side in AJAX.
Proxyless calls are made using utility JavaScript functions like HTML_AJAX.replace() and HTML_AJAX.append() in AJAX.

47. How many types of ready states in Ajax?
There are four ready states in Ajax:

48. What is the difference between RegisterClientScriptBlock, RegisterClientScriptInclude and RegisterClientScriptResource?
Following are the functions:
    RegisterClientScriptBlock – The script is specified as a string parameter.
    RegisterClientScriptInclude – By setting the source attribute to a URL that point to a script file.
    RegisterClientScriptResource – specifies Resource name in an assembly. The source attribute is automatically populated with a URL by a call to an HTTP handler that retrieves the named script from the assembly.

49. Which request is better, Get or Post?
AJAX requests should use an HTTP GET request where the data does not change for a given URL requested.
An HTTP POST should be used when state is updated on the server. This is highly recommended for a consistent web application architecture.

50. What are the limitations of Ajax?
An Ajax Web Application tends to confuse end users if the network bandwidth is slow and there is no full postback running.

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