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When we download the text from javascriptphp, we can execute that text as JavaScript, which will cause the browser to look for a JavaScript function we ve written named show and call that function Here s how we start javascripthtml note that we create a button in HTML and connect it to a JavaScript function named getData:
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<html> <head> <title>Downloading JavaScript with Ajax</title> <script language = "javascript"> var XMLHttpRequestObject = false;
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if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } function getData(dataSource) { if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { } } XMLHttpRequestObjectsend(null); } } </script> </head> <body> <H1>Downloading JavaScript with Ajax</H1> <form> <input type = "button" value = "Get the JavaScript" onclick = "getData('javascriptphp')"> </form> <div id="targetDiv"> <p>The data will go here</p> </div> </body> </html>
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When you download the text (which reads, show( ) ) from javascriptphp, you can execute that text with the JavaScript eval function That s what the eval function does you pass it text and it executes that text as JavaScript
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The downloaded text will be in XMLHttpRequestObjectresponseText, and you can execute that text as JavaScript in this way in getData:
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function getData(dataSource) { if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { eval(XMLHttpRequestObjectresponseText); } } XMLHttpRequestObjectsend(null); } }
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Of course, this means that we ll need a JavaScript function named show In that function, we might just display the text Yep, it worked! in the web page Here s what that looks like in the final form of javascripthtml:
<html> <head> <title>Downloading JavaScript with Ajax</title> <script language = "javascript"> var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } function getData(dataSource) { if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); XMLHttpRequestObjectonreadystatechange = function()
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if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { eval(XMLHttpRequestObjectresponseText); } } XMLHttpRequestObjectsend(null); } } function show() { var targetDiv = documentgetElementById("targetDiv"); targetDivinnerHTML = "Yep, it worked!"; } </script> </head> <body> <H1>Downloading JavaScript with Ajax</H1> <form> <input type = "button" value = "Get the JavaScript" onclick = "getData('javascriptphp')"> </form> <div id="targetDiv"> <p>The data will go here</p> </div> </body> </html>
So when the user clicks the button, the application reads the text returned by javascriptphp and executes that text as JavaScript, calling the show function, which displays the message you see in Figure 4-5 This example demonstrates that you can download and execute JavaScript almost as easily as you can download text And that prepares you for working with Google Suggest, coming up next
Ajax: A Beginner s Guide
Figure 4-5
javascripthtml
Try This
Download JavaScript
Try creating a new Ajax-enabled web page that includes a JavaScript function named adder, which adds two values and returns the sum:
function adder(value1, value2) { return (item1 + item2) }
Then download the text adder(2, 3) from the server, execute it, and confirm that you get an answer of 5
Now that we ve seen how to download and execute JavaScript using Ajax, we re ready for the major example of this chapter connecting to Google Suggest
Connecting to Google Suggest
Behold Google Suggest in Figure 4-6 When you start typing a search term, Google Suggest suggests, in a drop-down list, matches to what you ve typed You then can select a term from that list, which saves you from having to type the whole search term You can connect to Google Suggest yourself by using Ajax, and we ll take a look at how to do that now Among other things, this example will let you learn how to use Ajax to respond to single keystrokes typed by the user Let s get our version of the Google Suggest page going now
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