vb.net barcode maker <body> <h1>Replacing Elements With the DOM</h1> in Java

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<body> <h1>Replacing Elements With the DOM</h1>
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<div id="targetDiv" width =100 height=100> <p id="text">The fetched message will appear here</p> </div> </body>
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So that s the element we ll work on replacing the <p> element with the ID "text" We ll also need a button that, when clicked, will download new text using Ajax and replace the <p> element That new text will be in a file named replace1txt, and here s the button that downloads this file:
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<body> <h1>Replacing Elements With the DOM</h1> <form> <input type = "button" value = "Download message 1" onclick = "getData('1')"> </form> <div id="targetDiv" width =100 height=100> <p id="text">The fetched message will appear here</p> </div> </body>
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That is, to download the file replace1txt, you simply have to pass "1" to the JavaScript function getData Let s add a second button to download a different file, replace2txt When you download replace2txt, the text in that file will replace the <p> element Here s what the second button looks like:
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<body> <h1>Replacing Elements With the DOM</h1> <form> <input type onclick = <input type onclick = </form>
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= "button" value = "Download message 1" "getData('1')"> = "button" value = "Download message 2" "getData('2')">
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<div id="targetDiv" width =100 height=100> <p id="text">The fetched message will appear here</p> </div> </body>
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Using the HTML DOM and Ajax
Okay, we re ready to write the JavaScript to download replace1txt and replace2txt Here s the text in replace1txt:
This text replaced the earlier text using the DOM
And here s the text in replace2txt:
This text also replaced the earlier text using the DOM
Now it s time to write the getData function that will do the actual downloading and replacing:
<script language = "javascript"> function getData(number) { } </script>
First, we ll create a new XMLHttpRequest object:
<script language = "javascript"> function getData(number) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } } </script>
Then we check if the XMLHttpRequest object was actually created:
<script language = "javascript"> function getData(number) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); }
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if(XMLHttpRequestObject) { } } </script>
If the XMLHttpRequest object was indeed created, we can configure it to download replace1txt or replace2txt, depending on whether "1" or "2" was passed to the getData function:
<script language = "javascript"> function getData(number) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "replace" + number + } } </script> "txt");
Next, we attach an anonymous inner function to the onreadystatechange property:
<script language = "javascript"> function getData(number) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); }
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if(XMLHttpRequestObject) {
Using the HTML DOM and Ajax
XMLHttpRequestObjectopen("GET", "replace" + number + XMLHttpRequestObjectonreadystatechange = function() { } } } </script>
"txt");
And we can check when the download is complete with the status and readyState properties:
<script language = "javascript"> function getData(number) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "replace" + number + XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { } } } } </script> "txt");
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Now that we ve downloaded the new text, it s time to create our new <p> element, which we ll use to replace the existing <p> element Here s how we use the createElement method to create the new <p> element:
<script language = "javascript"> function getData(number) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "replace" + number + XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var newPElement = documentcreateElement("p"); } } } } </script> "txt");
Note that the current <p> element the one about to be replaced has an ID of "text" We ll also give the new <p> element the same ID so that it can be replaced in turn (by a later button click):
<script language = "javascript"> function getData(number) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) {
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