JavaScript Questions and Answers

41.Which of the following is true?

A. If onKeyDown returns false, the key-press event is cancelled.
B. If onKeyPress returns false, the key-down event is cancelled.
C. If onKeyDown returns false, the key-up event is cancelled.
D. If onKeyPress returns false, the key-up event is canceled.

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42. Syntax for creating a RegExp object:
1. var txt=new RegExp(pattern,attributes);
2. var txt=/pattern/attributes;
Which of the above mentioned syntax will correct?

A. 1 only
B. 2 only
C. Both 1 and 2
D. None of the above

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43. If para1 is the DOM object for a paragraph, what is the correct syntax to change the text within the paragraph?

A. "New Text"?
B. para1.value="New Text";
C. para1.firstChild.nodeValue= "New Text";
D. para1.nodeValue="New Text";

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44. The syntax of Eval is ________________

A. [objectName.]eval(numeric)
B. [objectName.]eval(string)
C. [EvalName.]eval(string)
D. [EvalName.]eval(numeric)

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45. The _______ method of an Array object adds and/or removes elements from an array.

A. Reverse
B. Shift
C. Slice
D. Splice

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46. Which tag(s) can handle mouse events in Netscape?

A. <IMG>
B. <A>
C. <BR>
D. <span>

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47. Consider the following code snippet
const pi=3.14;
var pi=4;
What will be the output for the above code snippet?

A. This will flash an error
B. Prints 4
C. Prints 3.14
D. Ambiguity

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48. What is the default value of the asyc attribute?

A. 0
B. 1
C. False
D. True

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49. What is the purpose of the Attr object in the HTML DOM?

A. Used to focus on a particular part of the HTML page
B. HTML Attribute
C. Used to arrange elements
D. None of the mentioned

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50. Which among the following POSIX signals generate events?


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