CSCI 2910 JavaScript Quiz - Part 2 - Prof. David L. Tarnoff, Quizzes of Computer Science

Download CSCI 2910 JavaScript Quiz - Part 2 - Prof. David L. Tarnoff and more Quizzes Computer Science in PDF only on Docsity! Name: ________________________________ CSCI 2910 JavaScript Part 2 Quiz Spring 2006 1. Rewrite the following line of JavaScript using escape characters instead of the embedded single and double quotes. document.write("<a class='menu'>"); document.write("<a class=\"menu\">"); 2. Consider the line of code: retval = parseInt("1392 North Roan Street", 10); a.) What value would retval contain? 1392 b.) Would retval be a string or a scalar (numeric value)? parseInt() returns an integer value. 3. Consider the line of code: retval = parseFloat("$12.56"); What value would retval contain? "NaN" – the returned value would be "not a number" since the string begins with $. 4. Consider the line of code: retval = isNaN("tarnoff"); What value would retval contain? Since "tarnoff" is not a number, inNAN("tarnoff") would return "true". 5. True or False: The form object has a method reset() that is used to simulate the user pressing the reset button on a form. 6. JavaScript can be used to force the cursor to appear in a specific textbox using the form element method _____________. a.) force() b.) blur() c.) activate() d.) goto() e.) focus() f.) click() 7. The form element property .value works differently for different form elements. For each of the following, describe what value the property returns. text_name.value: returns the text contained inside the text box button_name.value: returns the text printed on the button face select_name.value: returns the value of the selected option 8. If the string email_string does not contain the symbol "@", what would the return value be for the JavaScript code email_string.indexOf("@")? If indexOf() does not find the character or substring it was looking for, it returns a -1.