2023 In this project you will create and x a document with a simple form that displays the value of a | Assignment Collections
Computer Science 2023 LetterGrades
2023 In this project you will create and x a document with a simple form that displays the value of a | Assignment Collections
In this project, you will create and fix a document with a simple form
that displays the value of a letter grade.
1. Create a new document in your text editor.
2. Type the <!DOCTYPE> declaration, <html> element, document
head, and <body> element. Use the Transitional DTD and
“Letter Grades” as the content of the <title> element.
3. Create a script section in the document head that includes the
following checkGrade() function and switch statement:
<script type=”text/javascript”>
/* <![CDATA[ */
function checkGrade() {
switch (grade)
case “A”:
window.alert(“Your grade is excellent.”;
break;
case “B”:
window.alert(“Your grade is good.”;
break;
case “C”:
window.alert(“Your grade is fair.”;
break;
case “D”:
window.alert(“You are barely passing.”;
break;
case “F”:
window.alert(“You failed.”;
break;
default:
window.alert(“Invalid letter!”;
}
/* ]]> */
</script>
4. Add the following form to the document body that includes
an onclick event handler that calls the checkGrade()
function. The value of the single text box is passed to the
checkGrade() function.
<form action=””
enctype=”application/x-www-form-urlencoded”>
<p><input type=”text” name=”grade” />
<input type=”button”
value=”Check Grade”
onclick=”checkGrade(this.value);” /></p>
</form>
5. Save the document as LetterGrades.html in the Exercises
folder for Chapter 8, and then open it in your Web browser.
You should receive an error message about a missing brace.
The problem is that the statements within the switch state-
ment are not contained within braces. Modify the switch
statement so that it includes braces, as follows:
switch (grade) {
case “A”:
window.alert(“Your grade is excellent.”;
break;
case “B”:
window.alert(“Your grade is good.”;
break;
case “C”:
window.alert(“Your grade is fair.”;
break;
case “D”:
window.alert(“You are barely passing.”;
break;
case “F”:
window.alert(“You failed.”;
break;
default:
window.alert(“Invalid letter!”;
}
6. Save the LetterGrades.html document, and reload it in
your Web browser window. You should receive another error
message about a missing closing parenthesis. Each of the
window.alert() statements in the switch statement is miss-
ing a closing parenthesis. Add the closing parenthesis to each
of the window.alert() statements, between the closing quo-
tation mark and the semicolon.
7. Save the LetterGrades.html document, and reload it in your
Web browser window. You should not receive any more error
messages when you reload the page. However, if enter a grade
into the text box and click the Check Grade button, you will see
an additional error about “grade” not being defined. The prob-
lem that causes this error is that the checkGrade() function def-
inition does not include the grade parameter, which is used in
the switch statement to evaluate the letter grade. Add the grade
parameter to the checkGrade() function definition, as follows:
function checkGrade(grade) {
…
8. Save the LetterGrades.html document, and reload it in your
Web browser window. Try entering a valid grade into the text
box and clicking the Check Grade button. No matter what
value you enter, you will always see the message “Invalid let-
ter!” in the alert box. The problem that is causing this error
is that the button element, which calls the checkGrade()
function, is incorrectly passing a value to the function of
this.value. The value of the grade text box, not the value
of the button, must be passed to the checkGrade() function.
Modify the argument that is passed to the checkGrade()
function, as follows:
onclick=”checkGrade(document.forms[0].grade.value);”
9. Save the LetterGrades.html document, and then validate the
document with the W3C Markup Validation Service. Once
the document is valid, close it in your text editor and reload it
in your Web browser window. The script should now function
correctly.
10. Close your Web
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