vb.net barcode maker Ajax: A Beginner s Guide in Java

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Ajax: A Beginner s Guide
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} else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("GET", dataSource); var timeoutIsSet = false; var downloadWentOK = false; XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 1) { if(!timeoutIsSet){ windowsetTimeout(function(){ if(!downloadWentOK){ } }, 1000); timeoutIsSet = true; } } } } } </script>
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And if the data was not downloaded by the time the operation timed out, we can display an error and abort the Ajax operation with the XMLHttpRequest object s abort method:
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<script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("GET", dataSource); var timeoutIsSet = false; var downloadWentOK = false;
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Using the HTML DOM and Ajax
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XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 1) { if(!timeoutIsSet){ windowsetTimeout(function(){ if(!downloadWentOK){ alert("Sorry, but I timed out"); XMLHttpRequestObjectabort(); } }, 1000); timeoutIsSet = true; } } } } } </script>
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On the other hand, if the download operation did go okay, we can display the data and set the downloadWentOK variable to true:
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<script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("GET", dataSource); var timeoutIsSet = false; var downloadWentOK = false; XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 1) { if(!timeoutIsSet){ windowsetTimeout(function(){ if(!downloadWentOK){ alert("Sorry, but I timed out"); XMLHttpRequestObjectabort(); } },
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Ajax: A Beginner s Guide
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1000); timeoutIsSet = true; } } if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { downloadWentOK = true; objinnerHTML = XMLHttpRequestObjectresponseText; } } XMLHttpRequestObjectsend(null); } } </script>
Note that at the end of the preceding code, we use the XMLHttpRequest object s send method to attempt to download the data Here s the whole example, timeouthtml:
<html> <head> <title>Handling Ajax Timeouts</title> <script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("GET", dataSource); var timeoutIsSet = false; var downloadWentOK = false; XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 1) { if(!timeoutIsSet){ windowsetTimeout(function(){ if(!downloadWentOK){
12:
Using the HTML DOM and Ajax
alert("Sorry, but I timed out"); XMLHttpRequestObjectabort(); } }, 1000); timeoutIsSet = true; } } if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { downloadWentOK = true; objinnerHTML = XMLHttpRequestObjectresponseText; } } XMLHttpRequestObjectsend(null); } } </script> </head> <body> <H1>Handling Ajax Timeouts</H1> <form> <input type = "button" value = "Download Message" onclick = "getData('datatxt', 'targetDiv')"> </form> <div id="targetDiv"> <p>The fetched data will go here</p> </div> </body> </html>
Because the file this example tries to download, datatxt, doesn t exist, the Ajax operation times out in this case, as you can see in the message box in Figure 12-4 Cool
Figure 12-4 Timing out in an Ajax application
Ajax: A Beginner s Guide
Downloading Images with Ajax
We ll take a look at one last example in this chapter, showing how to download images using Ajax What s that you ask Downloading images Can t you download only text-based data with Ajax That s right, you can download only text But that text can be the name of the image file you want to download, and if you use that image s filename to create an HTML <img> element, then the browser through the magic of dynamic HTML will download the image immediately, no page refresh needed Here s an example, imageshtml, that shows this in action First, we can add to the page two buttons that let the user download either of two images, image 1 or image 2, as well as a <div> element to display the new images in:
<body> <H1>Downloading Images With Ajax</H1> <form> <input type = "button" value = onclick = "getData('imageName1txt', <input type = "button" value = onclick = "getData('imageName2txt', </form>
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