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JavaScript Q & A
Interview Q & A >> JavaScript >>

Total JavaScript questions: 100

Q 1) What is JavaScript?
Q 2) How is JavaScript different from Java?
Q 3) What’s relationship between JavaScript and ECMAScript?
Q 4) How do you submit a form using Javascript?
Q 5) How do we get JavaScript onto a web page?
Q 6) How to read and write a file using javascript?
Q 7) How to detect the operating system on the client machine?
Q 8) What are JavaScript types?
Q 9) How do you convert numbers between different bases in JavaScript?
Q 10) How to create arrays in JavaScript?
Q 11) How do you target a specific frame from a hyperlink?
Q 12) What is a fixed-width table and its advantages?
Q 13) Example of using Regular Expressions for syntax checking in JavaScript.
Q 14) How to add Buttons in JavaScript?
Q 15) Where are cookies actually stored on the hard disk?
Q 16) What can JavaScript programs do?
Q 17) How to set a HTML document's background color?
Q 18) How can JavaScript be used to personalize or tailor a Web site to fit individual users?
Q 19) What does isNaN function do?
Q 20) What is negative infinity?
Q 21) In a pop-up browser window, how do you refer to the main browser window that opened it?
Q 22) What is the data type of variables of in JavaScript?
Q 23) Methods GET and POST in HTML forms - what's the difference?
Q 24) How to write a script for "Select" lists using JavaScript?
Q 25) What does the "Access is Denied" IE error mean?
Q 26) Is a javascript script faster than an ASP script?
Q 27) Are Java and JavaScript the Same?
Q 28) How to embed JavaScript in a web page?
Q 29) What are the problems associated with using JavaScript, and are there JavaScript techniques that you discourage?
Q 30) What boolean operators does JavaScript support?
Q 31) What does "1"+2+4 evaluate to?
Q 32) What are the ways to emit client-side JavaScript from server-side code in ASP.NET?
Q 33) What is the difference between RegisterClientScriptBlock and RegisterStartupScript?
Q 34) What is the difference between a web-garden and a web-farm?
Q 35) How to get the contents of an input box using JavaScript?
Q 36) How to determine the state of a checkbox using JavaScript?
Q 37) How to set the focus in an element using JavaScript?
Q 38) How to access an external JavaScript file that is stored externally and not embedded?
Q 39) What is the difference between an alert box and a confirmation box?
Q 40) What is a prompt box?
Q 41) Can javascript code be broken in different lines?
Q 42) Taking a developer’s perspective, do you think that that JavaScript is easy to learn and use?
Q 43) How about 2+5+"8"?
Q 44) What is the difference between SessionState and ViewState?
Q 45) What does the EnableViewStateMac setting in an aspx page do?
Q 46) How to Accessing Elements using JavaScript?
Q 47) What looping structures are there in JavaScript?
Q 48) To put a "close window" link on a page?
Q 49) How to hide JavaScript code from old browsers that don't run it?
Q 50) How to comment JavaScript code?
Q 51) Name the numeric constants representing max,min values.
Q 52) What does JavaScript null mean?
Q 53) How do you create a new object in JavaScript?
Q 54) How do you assign object properties?
Q 55) What’s a way to append a value to an array?
Q 56) What is this keyword?
Q 57) To set all checkboxes to true using JavaScript?
Q 58) How to select an element by id and swapping an image?
Q 59) What does undefined value mean in JavaScript?
Q 60) What is the difference between undefined value and null value?
Q 61) What is variable typing in JavaScript?
Q 62) Does JavaScript have the concept level scope?
Q 63) What are undefined and undeclared variables?
Q 64) How to find the selected radio button immediately using the 'this' variable?
Q 65) How to disable an HTML object?
Q 66) To write messages to the screen without using "document.write()"?
Q 67) How to Add new elements dynamically?
Q 68) How to have an element invoke a JavaScript on selection, instead of going to a new URL?
Q 69) How to create a popup warning box?
Q 70) How to create a confirmation box?
Q 71) How to create an input box?
Q 72) How to open a window with no toolbar, but with the location object?
Q 73) How to setting a cookie with the contents of a textbox?
Q 74) How to getting values from cookies to set widgets?
Q 75) How to Handle Event Handlers?
Q 76) How to remove the event listener?
Q 77) How to change style on an element?
Q 78) How to make elements invisible?
Q 79) How to set the cursor to wait?
Q 80) How to reload the current page?
Q 81) How to force a page to go to another page using JavaScript?
Q 82) How to convert a string to a number using JavaScript?
Q 83) How to convert numbers to strings using JavaScript?
Q 84) How to test for bad numbers using JavaScript?
Q 85) What's Math Constants and Functions using JavaScript?
Q 86) What's the Date object using JavaScript?
Q 87) What does the delete operator do?
Q 88) How to delete an entry using JavaScript?
Q 89) How to use strings as array indexes using JavaScript?
Q 90) How to use "join()" to create a string from an array using JavaScript?
Q 91) How to make a array as a stack using JavaScript?
Q 92) How to shift and unshift using JavaScript?
Q 93) How to create an object using JavaScript?
Q 94) How to associate functions with objects using JavaScript?
Q 95) What is eval() method?
Q 96) What does break and continue statements do?
Q 97) How to create a function using function constructor?
Q 98) What is Prototypes for JavaScript?
Q 99) What are unescape() and escape() functions?
Q 100) What are decodeURI() and encodeURI() functions?

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