vb.net barcode maker Using the HTML DOM and Ajax in Java

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Using the HTML DOM and Ajax
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Figure 12-2 Appending new elements using the DOM first message
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onclick = "getData('1')"> <input type = "button" value = "Download message 2" onclick = "getData('2')"> </form> <div id="targetDiv" width =100 height=100> <p id="text">The fetched message will appear here</p> </div> </body> </html>
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You can see the results in Figure 12-2 when the user clicks button 1, the first message is downloaded and displayed And, as you can see in Figure 12-3, when the user clicks button 2, the second message is downloaded and displayed
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Figure 12-3 Appending new elements using the DOM second message
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Handling Timeouts in Ajax
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Suppose you are all set to download a requested file or data item for the user in Ajax, but you can t find it What should you do After waiting a while for a download to occur, you should let the user know the operation timed out Otherwise, your Ajax application will just keep waiting for a nonexistent resource or a broken connection Here s an example, timeouthtml, that shows how to time out if an Ajax operation isn t successful after a certain amount of time In this case, we ll try to download a nonexistent file, datatxt, and then, when the operation fails, we ll time out and display a message box to the user We start timeouthtml with a button that the user can click to attempt to download datatxt in a function named getData:
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<body> <H1>Handling Ajax Timeouts</H1> <form> <input type = "button" value = "Download Message" onclick = "getData('datatxt', 'targetDiv')"> </form> </body>
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We ll add a <div> element to display the results in:
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<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>
Next, we ll create the getData function:
<script language = "javascript"> function getData(dataSource, divID) { } </script>
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And we ll need an XMLHttpRequest object:
<script language = "javascript">
Using the HTML DOM and Ajax
function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } } </script>
We ll use the JavaScript setTimeout function to set the timeout The idea is that if the data hasn t been downloaded in a second (1000 ms), we stop the download attempt and display an error message in a message box We start the process by configuring the XMLHttpRequest object:
<script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); } } </script>
Now we ll attach the anonymous function that will monitor the download:
<script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) {
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XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); XMLHttpRequestObjectonreadystatechange = function() { } } } </script>
When the download starts, the readyState property will contain a value of 1, and we want to set our timeout clock ticking at that point, by setting the timeout We don t want to set the timeout if it s already been set (which would reset it to 0), so we ll introduce a variable named timeoutIsSet and check if the timeout has already been set, this way:
<script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); var timeoutIsSet = false; XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 1) { if(!timeoutIsSet){ } } } } } </script>
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Using the HTML DOM and Ajax
To set the timeout, we will use the setTimeout function to call another anonymous function in 1000 ms:
<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(){ }, 1000); timeoutIsSet = true; } } } } } </script>
In the anonymous function, we will check if the download went okay by checking the value of a variable named downloadWentOK:
<script language = "javascript"> function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest();
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