Loops
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A function is a reusable block of code that can be called anywhere in a program to perform a specific task. This prevents having to rewrite the same code multiple times. The document provides an example function called sayHello() that displays an alert box with the text "Hello World" when clicked. It also explains that a for loop repeats a block of code a specified number of times, with the example looping and writing "hello" to the page the number of times dictated by the parameters.
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Loops
- 1. Javascript- Functions A function is a group of reusable code which can be called anywhere in your program. This stops the need of writing the same code again and again.
- 2. Copy the following code into dreamweaver <head> <script type="text/javascript"> function sayHello() { alert("Hello World") } </script> </head> <body> <input type="button" onclick="sayHello()" value="Say Hello" /> </body>
- 3. When you click on the link, it presents an alert box
- 4. Click inside the input type and press spacebar on your keyboard, a selection should appear, choose onmouseover.
- 5. Click inside the input type and press spacebar on your keyboard, a selection should appear, choose onmouseover.
- 6. Enter the following=> onmouseover=alert("hello") *click on liveview at the top of dreamweaver and see what happens.
- 7. Javascript: for Loop the for loop makes a list of code copy over and over. Open a new html page and copy the following into the body tag- <script type="text/javascript"> var bodyslam= prompt("enter a number"); bodyslam= parseFloat(bodyslam); if (bodyslam>= 200){ for(bodyslam=5;bodyslam<=5000000;bodyslam=bodyslam+30) document.write("<PRE>hello </PRE> "); } else { alert("not a high enough number, sorry") } </script> The value to enter How many times it repeats