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This assignment is to see your knowledge on Ajax-Enabled Rich Internet Applications (RIA) with XML and...

This assignment is to see your knowledge on Ajax-Enabled Rich Internet Applications (RIA) with XML and JSON, jQuery , DOM, and HTML, CSS, and JavaScript In order to successfully write the HTML, CSS, and JavaScript for this , you should have a good grasp of the following: Be creative

1.using the document.getElementByld method to obtain a reference to the DOM object representing the HTML element with the given ID.

2. innerHTML property of an object in the DOM

3.value property of a DOM object representing an HTML input element

4. registering an event handler using an intrinsic event attribute

5. placing your <script> element just before the </body> tag so that all the needed DOM objects have already been created

6.using variables to store values to be used later in the script

7. using the type attribute of an input tag to help validate user entries

8. developing a good algorithm for an event handler before trying to write syntactically correct JS code

9. converting a string to a number using Unary + Operartor (or parseInt or parseFloat if you like verbosity)

10. the kinds of events that occur that can occur and be handled: Click, mouseover, mouseout, focus, blur, change,...

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Homework Answers

Answer #1

1. document.getElementByld

<html>
<body>

<p id="demo">Click the button to change the text in this paragraph.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Hello World";
}
</script>

</body>
</html>

2.  innerHTML

<!DOCTYPE html>
<html>
<body>

<p id="demo" onclick="myFunction()">Click me to change my HTML content (innerHTML).</p>

<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Paragraph changed!";
}
</script>

</body>
</html>

3. .value property of a DOM

<!DOCTYPE html>
<html>
<body>

Name: <input type="text" id="myText" value="Mickey">

<p>Click the button to change the value of the text field.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
document.getElementById("myText").value = "Johnny Bravo";
}
</script>

</body>
</html>

4. registering an event handler using an intrinsic event attribute

<!DOCTYPE html>
<html>
<body>

<button onclick="document.getElementById('demo').innerHTML=Date()">The time is?</button>

<p id="demo"></p>

</body>
</html>

5. placing your <script> element just before the </body> tag so that all the needed DOM objects have already been created

6. using variables to store values to be used later in the script

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Variables</h2>

<p>In this example, x, y, and z are variables.</p>

<p id="demo"></p>

<script>
var x = 5;
var y = 6;
var z = x + y;
document.getElementById("demo").innerHTML =
"The value of z is: " + z;
</script>

</body>
</html>

7. using the type attribute of an input tag to help validate user entries

<!DOCTYPE html>
<html>
<body>

<h1>The input value attribute</h1>

<p>The value attribute specifies an initial value for an input field:</p>

<form action="/action_page.php">
<label for="fname">First name:</label><br>
<input type="text" id="fname" name="fname" value="John"><br>
<label for="lname">Last name:</label><br>
<input type="text" id="lname" name="lname" value="Doe"><br><br>
<input type="submit" value="Submit">
</form>

</body>
</html>

10. 10. the kinds of events that occur that can occur and be handled: Click, mouseover, mouseout, focus, blur, change,...

<!DOCTYPE html>
<html>
<body>

<p>This example uses the addEventListener() method to attach a "mouseover" and "mouseout" event to a h1 element.</p>

<h1 id="demo">Mouse over me</h1>

<script>
document.getElementById("demo").addEventListener("mouseover", mouseOver);
document.getElementById("demo").addEventListener("mouseout", mouseOut);

function mouseOver() {
document.getElementById("demo").style.color = "red";
}

function mouseOut() {
document.getElementById("demo").style.color = "black";
}
</script>

</body>
</html>

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