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function display() { documentwrite("You clicked the button"); } </script> </head> <body> <h1>Using JavaScript functions</h1> <form> <input type="button" onclick="display()" value="Click Here"> </form> </body> </html>
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Unfortunately not The display function will indeed be called after the body of the page loads when the user clicks the button and that s fine But there s a catch When the body of a page is loaded, you can no longer use the documentwrite method, because the document is considered closed And opening it again to write to it clears any text in it, so that s no good here all you d see is the You clicked the button message because the Using JavaScript functions header will have been overwritten The way to display new text in a web page after that page has been loaded is to write to an existing HTML element, like a <div> element For example, you might add a <div> element and give it the ID targetDiv:
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<html> <head> <title>Using JavaScript functions</title> <script language="javascript"> function display() { } </script> </head> <body> <h1>Using JavaScript functions</h1> <form> <input type="button" onclick="display()" value="Click Here"> </form>
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<div id="targetDiv"> </div> </body> </html>
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So how can you address the targetDiv element in the JavaScript code in the display function You have to tell JavaScript which HTML element you want to place text into in order to display that text, and to find an HTML element in the web page, you can use the JavaScript method documentgetElementById You pass this method the ID of the element you want to find; to pass data to a method or function, you enclose that data in the parentheses (as you did with documentwrite: document write("Here is the text")) So to find the targetDiv HTML element, you can call document getElementById('targetDiv') This method call returns an object corresponding to the targetDiv <div> element when a method or function returns data, you get access to that data For example, the object corresponding to the targetDiv <div> element supports various methods and properties of its own, and one of those properties, innerHTML, contains the text now in the element That means you can store new text in the element by assigning that new text to the expression documentgetElementById('targetDiv')innerHTML Here s the way you can store the text You clicked the button in the targetDiv <div> element:
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<html> <head> <title>Using JavaScript functions</title> <script language="javascript"> function display() { documentgetElementById('targetDiv')innerHTML = "You clicked the button"; } </script> </head> <body> <h1>Using JavaScript functions</h1> <form> <input type="button" onclick="display()" value="Click Here"> </form> <div id="targetDiv"> </div> </body> </html>
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Great, we re ready to go; open functionshtml in a browser, and click the button When you do, you ll see the text You clicked the button displayed, as shown in Figure 2-6
2:
Getting to Know JavaScript
Figure 2-6
Using JavaScript functions and HTML buttons
Passing Data to Functions
Just as you can pass data to the methods already built into JavaScript, so too can you pass data to the functions you create For example, say that you want to specify the message that you want to display by passing that message to the display function You could pass that message to the display function by placing it inside the parentheses when you call display in a new web page, messagehtml, as we ve seen with calls to methods:
<html> <head> <title>Passing data to functions</title> <script language="javascript"> function display() { } </script> </head> <body> <h1>Passing data to functions</h1> <form> <input type="button" onclick= "display('You are seeing this thanks to JavaScript')" value= "Click Here"> </form>
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<div id="targetDiv"> </div> </body> </html>
So how do you read the message that was passed to the display function in code It s simple you just give a name to the data passed to the display function by listing that name in the parentheses when you create the display function:
<html> <head> <title>Passing data to functions</title> <script language="javascript"> function display(message) { } </script> </head> <body> <h1>Passing data to functions</h1> <form> <input type="button" onclick= "display('You are seeing this thanks to JavaScript')" value= "Click Here"> </form> <div id="targetDiv"> </div> </body> </html>
Now you can refer to the data passed to the display function with the name you ve given that data message in the body of the function So, for example, to display that message in the web page, you could do this (messagehtml):
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