JAVASCRIPT

Questions

1. Consider the following JavaScript alert: Which of the following will run the function when a user opens the page?
2. Which of the following is not a valid method in generator-iterator objects in JavaScript?
3. How can created cookies be deleted using JavaScript?
4. Which of the following is not a valid Date Object method in JavaScript?
5. Which of the following Array methods in JavaScript runs a function on every item in the Array and collects the result from previous calls, but in reverse?
6. When setting cookies with JavaScript, what will happen to the cookies.txt data if the file exceeds the maximum size?
7. Which of the following can be used for disabling the right click event in Internet Explorer?
8. Consider the following JavaScript validation function: Which of the following options will call the function as soon as the user leaves the field?
9. What will be output of the following code?
10. Consider the following image definition: Which of the following will change the image to companylogo2.gif when the page loads?
11. Which of the following are correct values of variableC, and why?
12. Which of the following determines whether cookies are enabled in a browser or not?
13. Which of the following will randomly choose an element from an array named myStuff, given that the number of elements changes dynamically?
14. Which of the following modifiers must be set if the JavaScript lastIndex object property was used during pattern matching?
15. An image tag is defined as follows: The purpose of the ImageChange() function is to change the image source to Image2.jpg. Which of the following should the ImageChange() function look like?
16. Which of the following is true about setTimeOut()?
17. Which of the following objects in JavaScript contains the collection called "plugins"?
18. Which of following uses the "with" statement in JavaScript correctly?
19. Which event can detect when the user highlights text within a text or textarea object?
20. Consider the following code snippet: What is the best way to remove the property 'regex', so the result would be this code snippet?
21. Which of the following is the best way to show both single and double quotes in the same sentence?
22. Which of the following statements is true regarding importing JavaScript files inside of other JavaScript files?
23. Which of the following shortcuts can be used for writing multiple document.write statements?
24. In JavaScript, the encodeURI() function is used to encode special characters. Which of the following special characters is/are an exception to that rule?
25. Consider the following code:
    Which of the following is the best method to get the line number of the form's text area?
26. Which of the following code snippets shows an alert for an empty string?
27. Consider the following code: How would you delete the color property of the variable seter?
28. Is the following statement regarding expression closures in JavaScript true or false? The syntax function(x) { return x*x; } can be written as function(x) x*x.
29. Which of the following statements regarding this String prototype is correct?
30. What will be the result of the following code?
31. Which of the following will determine if the user's browser is named “Netscape”?
32. Given a p element with some text content, which of the following code snippets sets the background color of the text to yellow, its color to red, and its font size to 20px?
33. Which of the following are not valid HTML events?
34. Which of the following options is used to access the attributes in E4X?
35. Which of the following can be used to write a JavaScript function that will accept user input?
36. How can the operating system of the client machine be detected?
37. Which of the following prints "AbBc"?
38. Which of the following descriptions is true for the code below?
39. Performance-wise, which is the fastest way of repeating a string in JavaScript?
40. Consider the following variable declarations: Which of the following would return the sentence "adam and eve"?
41. Which of the following code snippets will correctly split "str"?
42. Which object can be used to ascertain the protocol of the current URL?
43. How can a JavaScript object be printed?
44. Which of the following is the correct syntax for using the JavaScript exec() object method?
45. Having an array object var arr = new Array(), what is the best way to add a new item to the end of an array?
46. Which of the following will check whether the variable vRast exists or not?
47. Which of the following choices will detect if "variableName" declares a function?
48. How can global variables be declared in JavaScript?
49. Which of the following methods will copy data to the Clipboard?
50. Which of the following code snippets trims whitespace from the beginning and end of the given string str?
51. What is the difference between call() and apply()?
52. What is the meaning of obfuscation in JavaScript?
53. Which of the following best describes a "for" loop?
54. Which of the following descriptions best describes the code below?
55. Which of the following code snippets returns "[object object]"?
56. Analyze the following code snippet which uses a Javascript Regular Expression character set. What will be the output of this code?
57. What is the final value of the variable bar in the following code?
58. Which of the following are JavaScript unit testing tools?
59. Which of the following can be used to invoke an iframe from a parent page?
60. Which of the following Array methods in JavaScript runs a function on every item in the Array and collects the result from previous calls, but in reverse?
61. In an HTML page, the form tag is defined as follows:
    The validate() function is intended to prevent the form from being submitted if the name field in the form is empty. What should the validate() function look like?
62. Which of the following code snippets changes an image on the page?
63. Which of the following results is returned by the JavaScript operator "typeof" for the keyword "null"?
64. What will be the final value of the variable "apt"? var apt=2; apt=apt<<2;
65. Which of the following code snippets removes objects from an associative array?
66. Having an array object var arr = new Array(), what is the best way to add a new item to the end of an array?
67. What is the error in the statement: var charConvert = toCharCode('x');?
68. Which of the following choices will change the source of the image to "image2.gif" when a user clicks on the image?
69. Are the two statements below interchangeable? 1. object.property 2. object[''property'']
70. Which of the following code snippets will return all HTTP headers?
71. Which of the following is the most secure and efficient way of declaring an array?
72. Which of the following Regular Expression pattern flags is not valid?
73. Which of the following built-in functions is used to access form elements using their IDs?
74. Which of the following statements is correct?
75. Which of the following correctly uses a timer with a function named rearrange()?
76. Which of the following can be used to escape the ' character?
77. Which event can be used to validate the value in a field as soon as the user moves out of the field by pressing the tab key?
78. Which of the following are not global methods and properties in E4X?
79. which of the following will change the color of a paragraph's text to blue when a user hovers over it, and reset it back to black when the user hovers out?
80. Which of the following options can be used for adding direct support for XML to JavaScript?