JavaScript Interview Questions and Answers (294) - Page 1

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How to get value from a textbox?

Write following code

alert(document.getElementById('txtbox1').value);

How to get value from dropdown (select) control?

Write following code

alert(document.getElementById('dropdown1').value);

How to get value from RadioButtonList control?

Here id is the name property of the RadioButtonList

function GetRadioButtonValue(id)

        {

            var radio = document.getElementsByName(id);

            for (var ii = 0; ii < radio.length; ii++)

            {

                if (radio[ii].checked)

                    alert(radio[ii].value);

            }

        }

For more details, click http://www.dotnetfunda.com/articles/article72.aspx

How to get CheckBox status whether it is checked or not?

Write following code

alert(document.getElementById('checkbox1').checked);

if it will be checked you will get true else false.

How to toggle display an HTML element?

Call following function

function ToggleFollowingText(id)

        {

            document.getElementById(id).style.display == '' ? document.getElementById(id).style.display = 'none' : document.getElementById(id).style.display = '';

        }

In above function you need to pass id of the html element as the parameter.
If the control is already displaying then it will hide otherwise it will be shown.

What Boolean operators are not supported by JavaScript?

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What does is Nan function do?

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Who Developed JavaScript?

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Which method is used to clear an Array in javascript?

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For generating random numbers we have to used the following function?

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JavaScript is interpreted by _________

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Which of the following is not considered a JavaScript keyword?

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What does the <noscript> tag do?

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What should appear at the very end of your JavaScript? The <script LANGUAGE="JavaScript">tag

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String Operations: What will be the Output of the Following Code var ContentURL="http://MySite1/online-tests/1111-First-questions"; ContentURL= ContentURL.substring(ContentURL.lastIndexOf("/")+1,ContentURL.length); var LastIndex; if(ContentURL.indexOf('-')>-1) LastIndex=ContentURL.indexOf('-'); else LastIndex=ContentURL.length; ContentURL= ContentURL.substring(ContentURL.lastIndexOf("/")+1,LastIndex);

NOTE: This is objective type question, Please click question title for correct answer.

Name the DataTypes of JavaScript?

1)Integer
2)String
3)Boolean
4)Null

Which method is used to convert a string to uppercase letters?

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What will be the Output of the following using JavaScript document.Write(Math.Round(6.7));

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Which method is used to Clear an array using JavaSctipt?

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Object can be assigned property by...

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