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//@desc    load a page(some html) via xmlhttp,and display on a container//@param   url          the url of the page will load,such as "index.php"http://@param   request      request string to be sent,such as "action=1&name=surfchen"http://@param   method       POST or GET//@param   container          the container object,the loaded page will display in container.innerHTML//@usage//         ajaxLoadPage(‘index.php‘,‘a(chǎn)ction=1&name=surfchen‘,‘POST‘,document.getElementById(‘my_home‘))//         suppose there is a html element of "my_home" id,such as "<span id=‘my_home‘></span>"http://@author  SurfChen <surfchen@gmail.com>//@url     http://www.surfchen.org///@license http://www.gnu.org/licenses/gpl.html GPLfunction ajaxLoadPage(url,request,method,container){method=method.toUpperCase();var loading_msg=‘Loading...‘;//the text shows on the container on loading.var loader=new XMLHttpRequest;//require Cross-Browser XMLHttpRequestif (method==‘GET‘){urls=url.split("?");if (urls[1]==‘‘ || typeof urls[1]==‘undefined‘){url=urls[0]+"?"+request;}else{url=urls[0]+"?"+urls[1]+"&"+request;}request=null;//for GET method,loader should send NULL}loader.open(method,url,true);if (method=="POST"){loader.setRequestHeader("Content-Type","application/x-www-form-urlencoded");}loader.onreadystatechange=function(){if (loader.readyState==1){container.innerHTML=loading_msg;}if (loader.readyState==4){container.innerHTML=loader.responseText;}}loader.send(request);}//@desc    transform the elements of a form object and their values into request string( such as "action=1&name=surfchen")//@param   form_obj          the form object//@usage   formToRequestString(document.form1)//@notice  this function can not be used to upload a file.if there is a file input element,the func will take it as a text input.//         as I know,because of the security,in most of the browsers,we can not upload a file via xmlhttp.//         a solution is iframe.//@author  SurfChen <surfchen@gmail.com>//@url     http://www.surfchen.org///@license http://www.gnu.org/licenses/gpl.html GPLfunction formToRequestString(form_obj){var query_string=‘‘;var and=‘‘;//alert(form_obj.length);for (i=0;i<form_obj.length ;i++ ){e=form_obj[i];if (e.name!=‘‘){if (e.type==‘select-one‘){element_value=e.options[e.selectedIndex].value;}else if (e.type==‘checkbox‘ || e.type==‘radio‘){if (e.checked==false){break;}element_value=e.value;}else{element_value=e.value;}query_string+=and+e.name+‘=‘+element_value.replace(/\&/g,"%26");and="&"}}return query_string;}//@desc    no refresh submit(ajax) by using ajaxLoadPage and formToRequestString//@param   form_obj          the form object//@param   container          the container object,the loaded page will display in container.innerHTML//@usage   ajaxFormSubmit(document.form1,document.getElementById(‘my_home‘))//@author  SurfChen <surfchen@gmail.com>//@url     http://www.surfchen.org///@license http://www.gnu.org/licenses/gpl.html GPLfunction ajaxFormSubmit(form_obj,container){ajaxLoadPage(form_obj.getAttributeNode("action").value,formToRequestString(form_obj),form_obj.method,container)}