我正在使用Greasemonkey腳本從RSS提要http://www.instapaper.com/folder/48337/rss/11185/QBV0RZfH4KBO7GwgrR3D8b7sv90中提取數據並使用jQuery將其插入到頁面中。該地址返回有效的RSS,但是當Greasemonkey觸發一個Ajax調用時(見下文),它總是返回一個空請求並觸發錯誤回調。我在Ajax調用中缺少什麼?jQuery.ajax調用返回一個空的數據容器,但原始URL工作
$.ajax({
url: "http://www.instapaper.com/folder/48337/rss/11185/QBV0RZfH4KBO7GwgrR3D8b7sv90",
dataType: "xml",
data: "",
type: "GET",
success: function (data){
var classString = "";
$("item",data).each(function (i) {
classString = classString + "<li><a href='" + $("link",this).text() + "'>" + $("title",this).text() + "</a></li>";
});
var message = "<div id='classes'><h2>Class Links</h2><ul>" + classString + "</ul></div>";
$("#sidelinks").prepend(message);
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
$("#sidelinks").prepend("<div id='classes'><h2>Class Links</h2><p>There was an error accessing class link information.</p></div>");
}
});
我不太清楚,如果這是它,但我jQuery.ajax
呼叫似乎比發行時,我只需將RSS URL粘貼到我的位置欄中不同類型的HTTP調用的。即使我指定請求是「GET」,jQuery似乎在發送「OPTIONS」請求。下面是我的Ajax請求發出的呼叫以及工作請求通過Live HTTP Headers捕獲的輸出,通過將URL輸入到位置欄中 -
此人使用空(?)響應觸發Ajax錯誤回調對象:
http://www.instapaper.com/folder/48337/rss/11185/QBV0RZfH4KBO7GwgrR3D8b7sv90
OPTIONS /folder/48337/rss/11185/QBV0RZfH4KBO7GwgrR3D8b7sv90 HTTP/1.1
Host: www.instapaper.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
Origin: http://home.bju.edu
Access-Control-Request-Method: GET
Access-Control-Request-Headers: x-requested-with
HTTP/1.x 200 OK
Date: Thu, 27 Aug 2009 15:16:53 GMT
Server: Apache
P3P: CP="ALL ADM DEV PSAi COM OUR OTRo STP IND ONL"
Vary: Accept-Encoding
Content-Type: text/xml; charset=utf-8
Content-Length: 1210
Age: 0
這成功地在瀏覽器中顯示的數據(當我在地址欄中拖放URL會發生什麼):
http://www.instapaper.com/folder/48337/rss/11185/QBV0RZfH4KBO7GwgrR3D8b7sv90
GET /folder/48337/rss/11185/QBV0RZfH4KBO7GwgrR3D8b7sv90 HTTP/1.1
Host: www.instapaper.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
HTTP/1.x 200 OK
Date: Thu, 27 Aug 2009 15:18:04 GMT
Server: Apache
P3P: CP="ALL ADM DEV PSAi COM OUR OTRo STP IND ONL"
Vary: Accept-Encoding
Content-Type: text/xml; charset=utf-8
Content-Length: 1210
Age: 0
嗯,我試過,但沒有成功。那裏有其他想法嗎? – 2009-08-26 19:34:43
你究竟做了什麼? 「{}」不適用於XML我假設...也許只是一個空字符串? – 2009-08-27 17:14:56
我試過「{}」和空字符串「」(這是我在上面編輯的問題)。我不確定發生了什麼,除非它與HTTP GET和HTTP OPTIONS之間的區別有關。 – 2009-08-27 17:40:25