JavaScript Cert Prep

In JavaScript, a logic error:

• is another term for a run-time error

• is another term for a syntax error

• is harder to troubleshoot because debuggers do not detect it

• can be detected and repaired automatically with an advanced debugger

Watchpoints can assist a developer in troubleshooting

• run-time errors

• syntax errors

• logic errors

• browser errors

What is the result of this code?

<script type="text/javascript"> function ClientMessage(){ var message = "Welcome!"; alert(message); } </script>

• When you enter the page, the alert box will display

• When you enter the page, you will be warned that there is unfinished JavaScript to run.

• The page will ignore the function, so a blank page will display on entry and exit.

• When you enter the page, there will be a JavaScript error because you cannot load an alert box.

Which String object method can be used to test user input?

• The link() method

• The toLowCase() method

• The test() method

• The indexOf() method

The JavaScript toUpperCase() method is an example of:

• a calling statement.

• an argument.

• a user-defined function

• a built-in function

Which JavaScript statement should you use to execute a block of code for as long as a certain test condition is true, with the guarantee that the code block will execute at least once?

• if

• do

• if....else

• do...while

Which of the following JavaScript code segments correctly accesses the user's entry in a text object named myTextBox in a form named myForm?

• var myVar;

  myVar = document.myForm.myTextbox.text;

• var myVar;

  myVar = document.myForm.myTextbox.input;

• var myVar;

  myVar = document.myForm.myTextbox.value;

• var myVar;

  myVar = document.myForm.myTextbox.content;

Which database operation can AJAX perform when used with SQL, a server-side language and a database?

• Modify database security permissions, including changing the database owner

• Create custom database views and stored procedures

• Retrieve information from a database and display it back to the page originating the request

• Update the database schema and table relationships

Which method is used to request and capture data from a user?

• The prompt() method

• The alert() method

• The open() method

• The confirm() method

Which of the following code segments properly scripts a JavaScript for statement?

• for (var i = 0, i <= 10, i--) {

  document.write("loop number " + i + "<br />");

  }

• for (var i = 0; i >= 10; i++) {

  document.write("loop number " + i + "<br />");

  }

• for (var i = 0; i <= 10; i++) {

  document.write("loop number " + i + "<br />");

  }

• for (var i = 0, i >= 0, i--) {

  document.write("loop number " + i + "<br />");

  }