我认为我的问题很简单（但我很简单），我不使用jquery或任何其他插件只是纯JavaScript和PhP。 我有一个带有选择字段的简单表单，其中可以选择多个项目，例如：
<form id="test" name="test">
<input type="hidden" id="norman" value="bates"/>
<select multiple="multiple" name="fred[]" id="fred[]">
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
<option value="4">four</option>
</select>
<input type="button" id="button" value="test" onclick="callAHAH('POST','my-page.php','container','loading...','modify-user')"/>
callAHAH是包装Ajax数据的javaScript函数，函数是：
function callAHAH(method,url, pageElement, callMessage,form_name){
//window.location = url;
//document.getElementById(pageElement).innerHTML = callMessage;
try{
req = new XMLHttpRequest(); /* ff */
}
catch(e){
try{
req = new ActiveObject("Msxml2.XMLHTTP"); /* some ie */
}
catch(e){
try{
req = new ActiveXObject("Microsoft.XMLHTTP"); /*other ie */
}
catch(e){
req = false;
}
}
}
req.onreadystatechange = function(){responseAHAH(pageElement);};
var build_url=window.location.origin;
var url = "aj_scripts/"+url;
if(build_url=="http://localhost:8080"){
url=build_url+"/pitd_outer/pitd/"+url;
}
// Check request status
if(method=='POST'){
req.open("POST",url,true);
// adds a header to tell the PHP script to recognize the data as is sent via POST
req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
var the_data="";
///
var the_form=document.getElementById(form_name);
//alert(form_name);
for (var i=0;i<the_form.length;i++){
var the_type = the_form.elements[i].type;
var value;
if(the_type !="button"){
if(the_type =="checkbox"){
value = the_form.elements[i].checked
// alert("the array name is: "+the_array_name+" and it is checked:"+checked);
}else{
value=the_form.elements[i].value;
}
var id= the_form.elements[i].id;
the_data+=id;
the_data+="="+value+"&";
}
}
the_data=the_data.substring(0,the_data.length-1);//removing the last & symbol
// alert(the_data);
req.send(the_data); // calls the send() method with datas as parameter
}else if(method=="GET"){
req.open("GET",url,true);
req.send(null);
}
}
JS处理程序一直工作正常，直到我尝试选择多个项目，然后代码只返回第一个或最后一个选定的项目。
我知道表单正在发送一个数组，但我似乎无法让代码正确测试我试过的数组
var array_test=Array.isArray(the_form.elements[i]);
alert("array test:"+array_test);
但我得到的都是假的......
如何为帖子的文本字符串格式化它
my_array[]=1$my_array[]=2 etc
提前感谢您的帮助
禅
答案 0 :(得分：0)
好的，我有答案！
function callAHAH(method,url, pageElement, callMessage,form_name){
//window.location = url;
//document.getElementById(pageElement).innerHTML = callMessage;
try{
req = new XMLHttpRequest(); /* ff */
}
catch(e){
try{
req = new ActiveObject("Msxml2.XMLHTTP"); /* some ie */
}
catch(e){
try{
req = new ActiveXObject("Microsoft.XMLHTTP"); /*other ie */
}
catch(e){
req = false;
}
}
}
req.onreadystatechange = function(){responseAHAH(pageElement);};
var build_url=window.location.origin;
var url = "aj_scripts/"+url;
if(build_url=="http://localhost:8080"){
url=build_url+"/pitd_outer/pitd/"+url;
}
// Check request status
if(method=='POST'){
req.open("POST",url,true);
// adds a header to tell the PHP script to recognize the data as is sent via POST
req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
var the_data="";
///
var the_form=document.getElementById(form_name);
//alert(form_name);
for (var i=0;i<the_form.length;i++){
var the_type = the_form.elements[i].type;
var value;
if(the_type !="button"){
if(the_type =="checkbox"){
value = the_form.elements[i].checked
var id= the_form.elements[i].id;
the_data+=id;
the_data+="="+value+"&";
}else if(the_form.elements[i].hasAttribute('multiple') == true){
var test_data = "";
var the_multiples = the_form.elements[i].options;
if((the_form.elements[i].hasAttribute('getall')==true)&&(the_form.elements[i].getAttribute('getall')=="get_all")){
//a multiple select that we need to get all values from and not just those that are selected
alert("hi");
console.log("inside the_form_elements has attributes");
for(var j=0;j<the_multiples.length;j++){
test_data += the_form.elements[i].id+"="+the_multiples[j].value+"&";
}//end of for var j
}else{
//a select list with potentially multiple selections and only want the selected ones
for(var j=0;j<the_multiples.length;j++){
if(the_multiples[j].selected == true){
test_data += the_form.elements[i].id+"="+the_multiples[j].value+"&";
}//end of if the_multiples
}//end of for var j
}//end of the if the_form inner
test_data=test_data.substring(0,test_data.length-1);//removing the last & symbol
the_data +=test_data;
alert(test_data);
}else{
value=the_form.elements[i].value;
var id= the_form.elements[i].id;
the_data+=id;
the_data+="="+value+"&";
}//end of if the_form outer
}
}
the_data=the_data.substring(0,the_data.length-1);//removing the last & symbol
// alert(the_data);
req.send(the_data); // calls the send() method with datas as parameter
}else if(method=="GET"){
req.open("GET",url,true);
req.send(null);
}
}
function responseAHAH(pageElement){
var output='';
if(req.readyState == 4){
if(req.status == 200){
output = req.responseText;
document.getElementById(pageElement).innerHTML = output;
}
}
}
代码的重要部分是：
if(the_type !="button"){
if(the_type =="checkbox"){
value = the_form.elements[i].checked
var id= the_form.elements[i].id;
the_data+=id;
the_data+="="+value+"&";
}else if(the_form.elements[i].hasAttribute('multiple') == true){
var test_data = "";
var the_multiples = the_form.elements[i].options;
if((the_form.elements[i].hasAttribute('getall')==true)&&(the_form.elements[i].getAttribute('getall')=="get_all")){
//a multiple select that we need to get all values from and not just those that are selected
alert("hi");
console.log("inside the_form_elements has attributes");
for(var j=0;j<the_multiples.length;j++){
test_data += the_form.elements[i].id+"="+the_multiples[j].value+"&";
}//end of for var j
}else{
//a select list with potentially multiple selections and only want the selected ones
for(var j=0;j<the_multiples.length;j++){
if(the_multiples[j].selected == true){
test_data += the_form.elements[i].id+"="+the_multiples[j].value+"&";
}//end of if the_multiples
}//end of for var j
}//end of the if the_form inner
test_data=test_data.substring(0,test_data.length-1);//removing the last & symbol
the_data +=test_data;
alert(test_data);
}else{
value=the_form.elements[i].value;
var id= the_form.elements[i].id;
the_data+=id;
the_data+="="+value+"&";
}//end of if the_form outer
基本上我需要起诉JavaScript hasAttribute函数，我知道显然每个浏览器都不支持它，但它适用于IE10，以及FF O和C的最新版本。
从那里我不得不使用.options子选择来循环选择每个选项以查找所选的选项。
那些检查代码会注意到我有一个奇怪的条件，hasAttribute（'getall'），因为我有一个非常奇怪的情况，我需要从多个选择中获取所有值，无论是否他们再次被选中我知道非标准属性不是由所有浏览器提供，而是与我使用的那些一起移植。
问候
禅