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Ajax: A Beginner s Guide
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Here s the JavaScript downloaded, edited, and executed by the getData function:
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callback(frameElement, "a", new Array(2, "amazon", "855,000,000 results", "argos", "12,500,000 results", "aol", "278,000,000 results", "autotrader", "5,820,000 results", "apple", "436,000,000 results", "amazoncom", "461,000,000 results", "aolcom", "87,200,000 results", "american airlines", "14,600,000 results", "australian open", "12,300,000 results", "askcom", "39,600,000 results"), new Array(""));
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Our callback function should accept these arguments, so here s how to create that function:
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<script language = "javascript"> function callback(unusedVariable, searchTerm, arrayTerm, unusedArray) { } </script>
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We re going to display the drop-down list of suggestions as an HTML table, and we re going to store that HTML in a variable named data Here s how we create the data variable and set up a loop to add all the suggestions we get from Google Suggest:
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<script language = "javascript"> function callback(unusedVariable, searchTerm, arrayTerm, unusedArray) { var data = "<table>"; var loopIndex; for (loopIndex = 1; loopIndex < arrayTermlength; loopIndex++) { } data += "</table>"; } </script>
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And here s the actual loop that loops over the suggestions from Google Suggest note that we make the search terms into hyperlinks (pointing the user to Google), just as in the real Google Suggest page:
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<script language = "javascript"> function callback(unusedVariable, searchTerm, arrayTerm,
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4:
unusedArray) { var data = "<table>"; var loopIndex;
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for (loopIndex = 1; loopIndex < arrayTermlength; loopIndex++) { data += "<tr><td>" + "<a href='http://wwwgooglecom/search q=" + arrayTerm[loopIndex] + "'>" + arrayTerm[loopIndex] + '</a></td><td>' + arrayTerm[++loopIndex] + "</td></tr>"; } data += "</table>"; } </script>
Ask the Expert
Q: A:
What does the term ++loopIndex do in the above code Is it different from loopIndex++ Putting the JavaScript increment operator (introduced in 2) in front of a variable name (++loopIndex) adds 1 to the value of the variable before the rest of the JavaScript statement is executed, whereas putting the increment operator at the end of a variable name (loopIndex++) means that 1 will be added to the value in the variable after the rest of the statement has been executed It doesn t usually matter which one you choose, but here it does, because we needed to increment loopIndex before using it to reach the next suggestion in the array of suggestions
At the end of the code in the callback function, the data variable holds the HTML table we re going to use to display the suggestions we got from Google Suggest, and we display that table by assigning data to the innerHTML property of the <div> element that will show the drop-down list:
<script language = "javascript"> function callback(unusedVariable, searchTerm, arrayTerm, unusedArray) { var data = "<table>"; var loopIndex; for (loopIndex = 1; loopIndex < arrayTermlength; loopIndex++) {
Ajax: A Beginner s Guide
data += "<tr><td>" + "<a href='http://wwwgooglecom/search q=" + arrayTerm[loopIndex] + "'>" + arrayTerm[loopIndex] + '</a></td><td>' + arrayTerm[++loopIndex] + "</td></tr>"; } data += "</table>"; var targetDiv = documentgetElementById("targetDiv"); targetDivinnerHTML = data; } </script>
There s one last step here We can style the <div> element that displays the Google Suggest suggestions, giving it the appearance of a drop-down list Here s how we give HTML that appears in the <div> element a light-pink background, using a <style> element in the googlehtml application:
<html> <head> <title>Handling Google Suggest</title> <style> #targetDiv { background-color: #FFAAAA; width: 40%; } </style> <script language = "javascript"> function getData(dataSource)
And that finishes googlehtml here it is in all its glory:
<html> <head> <title>Handling Google Suggest</title> <style> #targetDiv { background-color: #FFAAAA; width: 40%; }
4:
</style> <script language = "javascript"> function getData(dataSource) { var XMLHttpRequestObject = false;
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if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var text = XMLHttpRequestObjectresponseTextreplace( "windowgoogleacSuggest_apply", "callback"); eval(text); } } XMLHttpRequestObjectsend(null); } } function askGoogleSuggest() { var input = documentgetElementById("textField"); if (inputvalue) { getData("googlephp qu=" + inputvalue); } else { var targetDiv = documentgetElementById("targetDiv"); targetDivinnerHTML = "<div></div>"; } }
function callback(unusedVariable, searchTerm, arrayTerm, unusedArray) { var data = "<table>"; var loopIndex;
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