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<script language = "javascript"> function getData(dataSource) { } </script>
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The dataSource argument will hold the URL of googlephp, along with the URL-encoded search term the user has typed We re going to connect to googlephp using Ajax in the getData function, and we ll start by creating an XMLHttpRequest object:
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<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"); } } </script>
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Now we can connect to googlephp in the usual way using an anonymous function:
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<script language = "javascript"> function getData(dataSource) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { } } } } </script>
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What kind of return text will we get from Google Suggest If your search term is a, for example, this is the text you ll get back from Google Suggest using Ajax:
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windowgoogleacSuggest_apply(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",
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"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(""));
This is JavaScript; Google Suggest returns a JavaScript function call (in text form, of course) that is built so that you can call a function of the same name in your Ajax application But that introduces a problem: if you try to create a function of this name, windowgoogle acSuggest_apply, Firefox and Internet Explorer will both have errors and tell you that their built-in window object does not contain a google property or method How can you fix that You can rename the function in the JavaScript returned from Google Suggest into something legal, such as callback :
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(""));
How do you rename "windowgoogleacSuggest_apply" as "callback" in the text you get back from Google Suggest You can use the handy JavaScript replace function, which is built to do just this replace text inside strings The text we get from Google Suggest (via google php) will be accessible in the responseText property of the XMLHttpRequest object, and we can use the replace method as follows to convert the call "windowgoogleacSuggest_apply" to "callback" and store the resulting, edited text in a variable named text:
<script language = "javascript"> function getData(dataSource) { var XMLHttpRequestObject = false; 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 =
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XMLHttpRequestObjectresponseTextreplace( "windowgoogleacSuggest_apply", "callback"); } } } } </script>
Excellent; now the JavaScript stored in the text variable can be treated as workable JavaScript (as soon as we create the function named callback) Here s how to execute that JavaScript with the eval function note that we also connect to the server with the XMLHttpRequest object s send method:
<script language = "javascript"> function getData(dataSource) { var XMLHttpRequestObject = false; 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); } } </script>
That completes the getData function, which calls the JavaScript downloaded from Google Suggest We ve edited that JavaScript so that it calls a function named callback, and now we have to write the callback function
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