AJAX - The Complete Reference

Chapter 3: XMLHttpRequest Object 81 PART I { var url = "http://ajaxref.com/ch3/setrating.php"; var payload = "rating=" + encodeV ...

82 Part I: Core Ideas Then, like the previous asynchronous example, a callback function must be registered, but this time when i ...

Chapter 3: XMLHttpRequest Object 83 PART I As shown in the previous section, the most likely known HTTP headers, particularly th ...

84 Part I: Core Ideas conforming or coming close and the others not doing so. Figure 3-3 shows the results of testing the common ...

Chapter 3: XMLHttpRequest Object 85 PART I FIGURE 3-3 Browser setRequest Header Support Circa 2007 ...

86 Part I: Core Ideas However, in the handleResponse function, it wouldn’t be useful to look at the responseText or responseXML ...

Chapter 3: XMLHttpRequest Object 87 PART I FIGURE 3-4 Exploring method support in XHR implementations ...

88 Part I: Core Ideas { alert("Before open method: readyState: " + xhr.readyState ); xhr.open("GET",url,true); xhr.onreadystatec ...

Chapter 3: XMLHttpRequest Object 89 PART I these are relatively harmless, save one in Internet Explorer that will break the obje ...

90 Part I: Core Ideas With the increased interest in JavaScript from Ajax, we may see the eventual introduction of thread contro ...

Chapter 3: XMLHttpRequest Object 91 PART I Yet, as you’ll see next, even if you are very aware of typical HTTP status codes, it ...

92 Part I: Core Ideas Other situations might not be so easy. What happens if there is a network problem or server crash midreque ...

Chapter 3: XMLHttpRequest Object 93 PART I the returned markup. With most analysis tools, it is easy enough to see the raw XML t ...

94 Part I: Core Ideas However, it is not so easy to see the parse tree so we show a simple example here of a walked responseXML ...

Chapter 3: XMLHttpRequest Object 95 PART I cannot be done effectively in a cross-browser fashion, as will be demonstrated in Cha ...

96 Part I: Core Ideas parser returns an XML tree with a root node of <parseerror> that contains information about the pars ...

Chapter 3: XMLHttpRequest Object 97 PART I Response Headers XHRs have two methods to read response headers: getResponseHeader(he ...

98 Part I: Core Ideas that will set a timer to be invoked after a particular period of time of nonresponsiveness from the server ...

Chapter 3: XMLHttpRequest Object 99 PART I { // handle response } } } } To see this idea in action, visit the example at http:// ...

100 Part I: Core Ideas The XMLHttpRequest object supports HTTP authentication in that it allows specification of a username and ...