barcode vb.net Handling Multiple XMLHttpRequest Objects in the Same Page in Java

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Handling Multiple XMLHttpRequest Objects in the Same Page
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Perhaps you recall the example from 3 in which we communicated with a PHP script on the server, dataresponderphp When you clicked button 1, a value of 1 was sent to the server, which sent that value back, as you see in Figure 4-1 When you clicked button 2, a value of 2 was sent to the server, which sent that value back So far so good But now say that the user gets impatient, and clicks buttons at random The problem is that the application uses only one XMLHttpRequest object, but now that object is being asked
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to send multiple requests to the server And depending on how fast or slow the server is, the responses could get mixed up the user could even click button 1, and then button 2, and see the response from clicking button 1 if the server returned the responses out of order That out-of-order possibility comes about because the application uses only one XMLHttpRequest object, even though the user might make multiple requests You can see the problem in the code, which just uses one XMLHttpRequest object (this is singlehtml, which has been renamed ajax3html from the previous chapter):
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<html> <head> <title>Sending Data to the Server</title> <script language = "javascript"> var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } function getData(dataSource, divID) { if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("GET", dataSource);
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XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { objinnerHTML = XMLHttpRequestObjectresponseText; } } XMLHttpRequestObjectsend(null); } } </script> </head> <body> <h1>Sending Data to the Server</h1> <form> <input type onclick = <input type onclick = </form>
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= "button" value = "Fetch message 1" "getData('dataresponderphp data=1', 'targetDiv')"> = "button" value = "Fetch message 2" "getData('dataresponderphp data=2', 'targetDiv')">
<div id="targetDiv"> <p>The fetched message will appear here</p> </div> </body> </html>
And here s the server-side code, dataresponderphp:
< php if ($_GET["data"] == "1") { echo 'The server got a value of 1'; } if ($_GET["data"] == "2") { echo 'The server got a value of 2'; } >
Okay, so the question becomes, how do you handle multiple XMLHttpRequest requests at more or less the same time Our first solution is the obvious one use two XMLHttpRequest objects
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Using Two XMLHttpRequest Objects
There are two buttons in singlehtml, but only one XMLHttpRequest object, which can lead to getting the responses mixed up How about we create two XMLHttpRequest objects, one for each button That s just what we ll do in a new example, doublehtml First, we create one XMLHttpRequest object, XMLHttpRequest1:
<html> <head> <title>Using Two XMLHttpRequest Objects</title> <script language = "javascript"> var XMLHttpRequestObject1 = false; if (windowXMLHttpRequest) { XMLHttpRequestObject1 = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject1 = new ActiveXObject("MicrosoftXMLHTTP"); }
Next, we create a new version of the getData function, getData1, that uses this XMLHttpRequest object:
<html> <head> <title>Using Two XMLHttpRequest Objects</title> <script language = "javascript"> var XMLHttpRequestObject1 = false; if (windowXMLHttpRequest) { XMLHttpRequestObject1 = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject1 = new ActiveXObject("MicrosoftXMLHTTP"); } function getData1(dataSource, divID) { if(XMLHttpRequestObject1) { var obj = documentgetElementById(divID); XMLHttpRequestObject1open("GET", dataSource); XMLHttpRequestObject1onreadystatechange = function()
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{ if (XMLHttpRequestObject1readyState == 4 && XMLHttpRequestObject1status == 200) { objinnerHTML = XMLHttpRequestObject1responseText; } } XMLHttpRequestObject1send(null); } }
Next, we create a second new XMLHttpRequest object, XMLHttpRequest2:
<html> <head> <title>Using Two XMLHttpRequest Objects</title> <script language = "javascript"> var XMLHttpRequestObject1 = false; if (windowXMLHttpRequest) { XMLHttpRequestObject1 = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject1 = new ActiveXObject("MicrosoftXMLHTTP"); } var XMLHttpRequestObject2 = false; if (windowXMLHttpRequest) { XMLHttpRequestObject2 = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject2 = new ActiveXObject("MicrosoftXMLHTTP"); } function getData1(dataSource, divID) { if(XMLHttpRequestObject1) { var obj = documentgetElementById(divID); XMLHttpRequestObject1open("GET", dataSource); XMLHttpRequestObject1onreadystatechange = function() { if (XMLHttpRequestObject1readyState == 4 &&
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