Ajax½éÉÜ XMLHttpRequest
Ajax½éÉÜ
AJAX - ä¯ÀÀÆ÷Ö§³Ö
AJAX µÄÒªµãÊÇ XMLHttpRequest ¶ÔÏó¡£²»Í¬µÄä¯ÀÀÆ÷´´½¨ XMLHttpRequest ¶ÔÏóµÄ·½·¨ÊÇÓвîÒìµÄ¡£IE ä¯ÀÀÆ÷ʹÓà ActiveXObject£¬¶øÆäËûµÄä¯ÀÀÆ÷ʹÓÃÃûΪ XMLHttpRequest µÄ JavaScript ÄÚ½¨¶ÔÏó¡£ÈçÐèÕë¶Ô²»Í¬µÄä¯ÀÀÆ÷À´´´½¨´Ë¶ÔÏó£¬ÎÒÃÇҪʹÓÃÒ»Ìõ "try and catch" Óï¾ä¡£
<script type="text/javascript">
function ajaxFunction()
{
var xmlHttp;
try{
xmlHttp=new XMLHttpRequest();// Firefox, Opera 8.0+, Safari
}
catch (e) {
try{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");// Internet Explorer 6.0+
}
catch (e) {
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");// Internet Explorer 5.5
}
catch (e) {
alert("ÄúµÄä¯ÀÀÆ÷²»Ö§³ÖAJAX£¡");
return false;}
}}
}
</script>
ÉùÃ÷Ò»¸ö±£´æ XMLHttpRequest ¶ÔÏóµÄ xmlHttp ±äÁ¿¡£È»ºóʹÓà XMLHttp=new XMLHttpRequest() À´´´½¨´Ë¶ÔÏó¡£ÕâÌõÓï¾äÕë¶Ô Firefox¡¢Opera ÒÔ¼° Safari ä¯ÀÀÆ÷¡£¼ÙÈçʧ°Ü£¬Ôò³¢ÊÔInternet Explorer 6.0+ µÄ xmlHttp=new ActiveXObject("Msxml2.XMLHTTP")£¬¼ÙÈçÒ²²»³É¹¦£¬Ôò³¢ÊÔInternet Explorer 5.5+ µÄ xmlHttp=new ActiveXObject("Microsoft.XMLHTTP")¡£¼ÙÈçÕâÈýÖÖ·½·¨¶¼²»Æð×÷Óã¬ÄÇôÕâ¸öÓû§ËùʹÓõÄä¯ÀÀÆ÷ÒѾ̫¹ýʱÁË£¬Ëû»òËý»á¿´µ½Ò»¸öÉùÃ÷´Ëä¯ÀÀÆ÷²»Ö§³Ö AJAX µÄÌáʾ¡£
AJAX - XMLHttpRequest¶ÔÏó
onreadystatechange ÊôÐÔ
onreadystatechange ÊôÐÔ´æÓд¦Àí·þÎñÆ÷ÏìÓ¦µÄº¯Êý¡£ÏÂÃæµÄ´úÂ붨ÒåÒ»¸ö¿ÕµÄº¯Êý£¬¿Éͬʱ¶Ô onreadystatechange ÊôÐÔ½øÐÐÉèÖãº
xmlHttp.onreadystatechange=function()
{
// ÎÒÃÇÐèÒªÔÚÕâÀïдһЩ´úÂë
}
readyState ÊôÐÔ
readyState ÊôÐÔ´æÓзþÎñÆ÷ÏìÓ¦µÄ״̬ÐÅÏ¢¡£Ã¿µ± readyState ¸Ä±äʱ£¬onreadystatechange º¯Êý¾Í»á±»Ö´ÐС££¨ÏêÇé²Î¼û AJAX – readyStateÏêÇ飩
״̬
ÃèÊö
Ïà¹ØÎĵµ£º
ºìÉ«×ÖÌåΪÖ÷Òª´úÂë
jspÒ³ÃæÖÐ
<script language="javascript">
function updateDB(operate){
var objDom=new ActiveXObject("msxml.DomDocument");
var objRoot=objDom.createElement("All");
objDom.appendChild(objRoot);
var k=document.ge ......
XMLHttpRequest ¶ÔÏóÊÇAJAX¹¦ÄܵĺËÐÄ£¬Òª¿ª·¢AJAX³ÌÐò±ØÐë´ÓÁ˽âXMLHttpRequest ¶ÔÏó¿ªÊ¼¡£
Á˽âXMLHttpRequest ¶ÔÏó¾ÍÏÈ´Ó´´½¨XMLHttpRequest ¶ÔÏó¿ªÊ¼£¬ÔÚ²»Í¬µÄä¯ÀÀÆ÷Öд´½¨XMLHttpRequest ¶ÔÏóʹÓò»Í¬µÄ·½·¨£º
ÏÈ¿´¿´IE´´½¨XMLHttpRequest ¶ÔÏóµÄ·½·¨£¨·½·¨1£©£º
va ......
½ñÌì³õ´Î½Ó´¥AjaxÄÇôÎÒ½«ÎÒµÄѧϰ¼Ç¼ÏÂÀ´£¬×î½ü¼ÇÐÔ²»Ì«ºÃ¡£±¸Íü°É
1¡¢Ê×ÏÈ´ÓÍøÂ·ÉÏÏÂÔØAjaxÀ©Õ¹°ü£¬VS2008Ö»ÊÇ´ø×Å×î»ù´¡µÄÈý¸öAjax¿Ø¼þ¡£ÄÇôÎÒÃÇÏÂÔØAjaxControlToolkit¿Ø¼þ£¬½«ÏÂÔØºóµÄѹËõ°ü½âѹ¡£ÕÒ³öAjaxControlToolkit.dllËùÔÚλÖá£
2¡¢ÔÚVS2008ÖУ¬ËæÒâÕÒÒ»¸öÑ¡Ï£¬»òÕߣ¬Ð½¨Ò»¸öÑ¡ÏÀ´·ÅÈëÎÒÃÇËù¼ÓÈëµÄ ......
AJAXµÄ·ÖÒ³£¬ÊµÏÖ˼·ÊÇ£º
¡¡¡¡1.ÀûÓÃ$.fn.extendÔÚJQuery¿ò¼ÜÏÂÀ©Õ¹pagerÀà
¡¡¡¡2.½«»ñÈ¡¼Ç¼×ÜÊýÓëÏàÓ¦Ò³¼Ç¼µÄºǫ́·½·¨£¬Ð´Ôڼ̳Ð×ÔIHttpHandlerÀàµÄHandler.ashx.csÀ࣬µ±È»Êµ¼ÊÉÏÓÃaspx.csÎļþдºǫ́·½·¨Ò²Ã»ÎÊÌ⣬µ«ÓÉÓÚ.ashx.csÎļþÎÞÐè´¦ÀíÒ³ÃæÖî¶àʼþÒò¶øÐ§Âʸü¸ß¡£
¡¡¡¡3.ÔÚ³ÊÏÖÒ³ÃæÉϼÓÔØpagerÀà
¡¡ ......
ÎÒÓÃPHPºÍAjax½áºÏ£¬Ìí¼ÓÊý¾ÝÖ®ºó£¬Ë¢ÐÂÇ°Ì¨Ò³Ãæ£¬Êý¾ÝûÓб仯¡£
ÎҸ͝PHP¶¯Ì¬½Å±¾£¬Ö»ÓÐÖØÐÂÕÒ¿ªIEÔÙÊäÈëµØÖ·£¬²ÅÄÜ¿´µ½Ð§¹û¡£
ÒÔÉÏÕâЩÊDz»ÊÇ»º´æµÄÔÒò°¡£¿Ôõô½â¾ö£¿
ajax»º´æÎÊÌâ½â¾ö;¾¶£º
ÊÇ»º´æµÄÎÊÌâ¡£
ÔÚ·þÎñ¶Ë¼Ó header("Cache-Control: no-cache, must-revalidate");
²¢ÇÒÔÚÄãµÄJSÌá½»²ÎÊýÖмÓËæ»ú» ......