What is the script build up by jQuery?
jQuery is a Javascript file and it is single javascript file that contains common DOM, event effects and Ajax functions.
How can we debug jQuery?
There are two ways to debug jQuery:
Debugger keyword
Add the debugger to the line from where we have to start debugging and then run Visual Studio in Debug mode with F5 function key.
Insert a break point after attaching the process
What are all the ways to include jQuery in a page?
Following are the ways to include jQuery in a page:
Local copy inside script tag
Remote copy of jQuery.com
Remote copy of Ajax API
Local copy of script manager control
Embedded script using client script object
What is the use of jQuery.ajax method ()?
jQuery.ajax method is used for asynchronous HTTP requests.
Where can we download JQuery?
jQuery javascript can be downloaded from jQuery official website – www.jquery.com
Is jQuery is a replacement of JavaScript?
No, jQuery is not a replacement of JavaScript.
What is called chaining?
Chaining is used to connect multiple events and functions in a selector.
What are the advantages of jQuery?
Following are the advantages of jQuery:
Just a JavaScript enhancement
Coding is simple, clear, reusable
Removal of writing more complex conditions and loops
Whether C# code behind can be called from jQuery?
Yes, we can call C# code behind from jQuery.
What is the use of jQuery.data() method?
jQuery data method is used to associate data with DOM nodes and JavaScript objects. This method will make a code very concise and neat.
What is the difference between onload() and document.ready()?
In a page, we can have only one onload function but we can have more than one document.ready function. Document.ready function is called when DOM is loaded but onload function is called when DOM and images are loaded on the page.
What is the use of jQuery each function?
jQuery each function is used to loop through each and every element of the target jQuery object. It is also useful for multi element DOM, looping arrays and object properties.
How method can be called inside code behind using jQuery?
$.ajax can be called and by declaring WebMethod inside code behind using jQuery.
Which is the fastest selector in jQuery?
ID and Element are the fastest selectors in jQuery.
What is the slowest selector in jQuery?
Class selectors are the slowest selectors in jQuery.
Where jQuery code is getting executed?
jQuery code is getting executed on a client browser.
What is the method used to define the specific character in place of $ sign?
‘NoConflict’ method is used to reference a jQuery and save it in a variable. That variable can be used instead of Sign.
Why jQuery is better than JavaScript?
jQuery is a library used for developing Ajax application and it helps to write the code clean and concise. It also handles events, animation and Ajax support applications.
What are the types of selectors in jQuery?
There are three types of selectors in jQuery:
CSS Selector
XPath Selector
Custom Selector
Enumerate the differences between Java and JavaScript?
Java is a complete programming language. In contrast, JavaScript is a coded program that can be introduced to HTML pages. These two languages are not at all inter-dependent and are designed for the different intent. Java is an object – oriented programming (OOPS) or structured programming language like C++ or C whereas JavaScript is a client-side scripting language and it is said to be unstructured programming.
What are JavaScript types?
Following are the JavaScript types:
isNan function returns true if the argument is not a number otherwise it is false.
Between JavaScript and an ASP script, which is faster?
JavaScript is faster. JavaScript is a client-side language and thus it does not need the assistance of the web server to execute. On the other hand, ASP is a server-side language and hence is always slower than JavaScript.
javascript-code-snippet
Javascript
What is negative infinity?
Negative Infinity is a number in JavaScript which can be derived by dividing negative number by zero.
Is it possible to break JavaScript Code into several lines?
Breaking within a string statement can be done by the use of a backslash, ‘\’, at the end of the first line
Example:
document.write("This is \a program");
And if you change to a new line when not within a string statement, then javaScript ignores break in line.
Example:
var x=1, y=2,
z=
x+y;
The above code is perfectly fine, though not advisable as it hampers debugging.
Which company developed JavaScript?
Netscape is the software company who developed JavaScript.
What are undeclared and undefined variables?
Undeclared variables are those that do not exist in a program and are not declared. If the program tries to read the value of an undeclared variable, then a runtime error is encountered.
Undefined variables are those that are declared in the program but have not been given any value. If the program tries to read the value of an undefined variable, an undefined value is returned.
jQuery is a Javascript file and it is single javascript file that contains common DOM, event effects and Ajax functions.
How can we debug jQuery?
There are two ways to debug jQuery:
Debugger keyword
Add the debugger to the line from where we have to start debugging and then run Visual Studio in Debug mode with F5 function key.
Insert a break point after attaching the process
What are all the ways to include jQuery in a page?
Following are the ways to include jQuery in a page:
Local copy inside script tag
Remote copy of jQuery.com
Remote copy of Ajax API
Local copy of script manager control
Embedded script using client script object
What is the use of jQuery.ajax method ()?
jQuery.ajax method is used for asynchronous HTTP requests.
Where can we download JQuery?
jQuery javascript can be downloaded from jQuery official website – www.jquery.com
Is jQuery is a replacement of JavaScript?
No, jQuery is not a replacement of JavaScript.
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| Check Point Software Most Frequently Asked JavaScript Interview Questions Answers |
What is called chaining?
Chaining is used to connect multiple events and functions in a selector.
What are the advantages of jQuery?
Following are the advantages of jQuery:
Just a JavaScript enhancement
Coding is simple, clear, reusable
Removal of writing more complex conditions and loops
Whether C# code behind can be called from jQuery?
Yes, we can call C# code behind from jQuery.
What is the use of jQuery.data() method?
jQuery data method is used to associate data with DOM nodes and JavaScript objects. This method will make a code very concise and neat.
What is the difference between onload() and document.ready()?
In a page, we can have only one onload function but we can have more than one document.ready function. Document.ready function is called when DOM is loaded but onload function is called when DOM and images are loaded on the page.
What is the use of jQuery each function?
jQuery each function is used to loop through each and every element of the target jQuery object. It is also useful for multi element DOM, looping arrays and object properties.
How method can be called inside code behind using jQuery?
$.ajax can be called and by declaring WebMethod inside code behind using jQuery.
Which is the fastest selector in jQuery?
ID and Element are the fastest selectors in jQuery.
What is the slowest selector in jQuery?
Class selectors are the slowest selectors in jQuery.
Where jQuery code is getting executed?
jQuery code is getting executed on a client browser.
What is the method used to define the specific character in place of $ sign?
‘NoConflict’ method is used to reference a jQuery and save it in a variable. That variable can be used instead of Sign.
Why jQuery is better than JavaScript?
jQuery is a library used for developing Ajax application and it helps to write the code clean and concise. It also handles events, animation and Ajax support applications.
What are the types of selectors in jQuery?
There are three types of selectors in jQuery:
CSS Selector
XPath Selector
Custom Selector
Enumerate the differences between Java and JavaScript?
Java is a complete programming language. In contrast, JavaScript is a coded program that can be introduced to HTML pages. These two languages are not at all inter-dependent and are designed for the different intent. Java is an object – oriented programming (OOPS) or structured programming language like C++ or C whereas JavaScript is a client-side scripting language and it is said to be unstructured programming.
Following are the JavaScript types:
- Number
- String
- Boolean
- Function
- Object
- Null
- Undefined
isNan function returns true if the argument is not a number otherwise it is false.
Between JavaScript and an ASP script, which is faster?
JavaScript is faster. JavaScript is a client-side language and thus it does not need the assistance of the web server to execute. On the other hand, ASP is a server-side language and hence is always slower than JavaScript.
javascript-code-snippet
Javascript
What is negative infinity?
Negative Infinity is a number in JavaScript which can be derived by dividing negative number by zero.
Is it possible to break JavaScript Code into several lines?
Breaking within a string statement can be done by the use of a backslash, ‘\’, at the end of the first line
Example:
document.write("This is \a program");
And if you change to a new line when not within a string statement, then javaScript ignores break in line.
Example:
var x=1, y=2,
z=
x+y;
The above code is perfectly fine, though not advisable as it hampers debugging.
Which company developed JavaScript?
Netscape is the software company who developed JavaScript.
What are undeclared and undefined variables?
Undeclared variables are those that do not exist in a program and are not declared. If the program tries to read the value of an undeclared variable, then a runtime error is encountered.
Undefined variables are those that are declared in the program but have not been given any value. If the program tries to read the value of an undefined variable, an undefined value is returned.
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