This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “Validation”.
1. In which part does the form validation occur?
a) Client
b) Server
c) Both Client and Server
d) None of the mentioned
View Answer
Explanation: Form validation used to occur at the server, after the client had entered all necessary data and then pressed the Submit button.
2. What would happen if the data in the client had been wrong?
a) Sends back the data
b) Waits for correction
c) Sends back the data and Waits for correction
d) None of the mentioned
View Answer
Explanation: If some of the data that had been entered by the client had been in the wrong form or was simply missing, the server would have to send all the data back to the client and request that the form be resubmitted with correct information.
3. What is the purpose of the basic validation?
a) Data correctness
b) Mere data existence
c) Both Data correctness and Mere data existence
d) None of the mentioned
View Answer
Explanation: First of all, the form must be checked to make sure data was entered into each form field that required it. This would need just loop through each field in the form and check for data.
4. What is the purpose of data format validation?
a) Data correctness
b) Mere data existence
c) Both Data correctness and Mere data existence
d) None of the mentioned
View Answer
Explanation: The data that is entered must be checked for correct form and value. This would need to put more logic to test correctness of data.
5. Which is the function that is called to validate a data?
a) validate()
b) valid()
c) validation()
d) none of the mentioned
View Answer
Explanation: There is no such function to validate a data) But, you can write a function with any name to validate the data.
6. How to find the index of a particular string?
a) position()
b) index()
c) indexOf()
d) none of the mentioned
View Answer
Explanation: The indexOf() function can be used to find out the index of a particular character or a string.
7. How do you focus a particular part of the HTML page in JavaScript?
a) hover()
b) focus()
c) on()
d) all of the mentioned
View Answer
Explanation: The focus() function can be used to focus a particular part of the HTML page in JavaScript.
8. Which of the following is the child object of the JavaScript navigator?
a) Navicat
b) Plugins
c) NetRight
d) None of the mentioned
View Answer
Explanation: The JavaScript navigator object includes a child object called plugins.
9. Which of the following are the properties of a plug-in entry?
a) name
b) filename
c) mimeTypes
d) all of the mentioned
View Answer
Explanation: Each plug-in has an entry in the array. Each entry has the following properties:
- name – is the name of the plug-in.
- filename – is the executable file that was loaded to install the plug-in.
- description – is a description of the plug-in, supplied by the developer.
- mimeTypes – is an array with one entry for each MIME type supported by the plug-in.
10. What is the purpose of the mimeTypes property of a plug-in entry?
a) Contains MIME properties
b) Contains MIME sizes
c) Contains MIME types
d) None of the mentioned
View Answer
Explanation: mimeTypes is an array with one entry for each MIME type supported by the plug-in.
Sanfoundry Global Education & Learning Series – Javascript Programming.
