jsp页面中通过js触发事件进行ajax传值,等到有jsp返回数据给ajax结果时,再次触发才有效怎么实现?

如何使用ajax传值到服务端,服务端进行处理返回到另一个JSP的table中?
点击左边的电站名得到相关数据库数据显示在右边JSP页面中
难道不是服务器传值出来 用ajax扒数据?再显示?
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社交帐号登录用ajax如何实现将数组从后台传回jsp页面中供js使用,谢谢!在线等
[问题点数:20分]
用ajax如何实现将数组从后台传回jsp页面中供js使用,谢谢!在线等
[问题点数:20分]
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本帖子已过去太久远了,不再提供回复功能。在jsp1页面中设置了一个条件查询按钮,通过点击按钮来触发AJAX传值给action,把查询结果存在list中,_百度知道2878人阅读
web前段(9)
&& & &&& 在jsp中,我们经常会遇到这种情况:当页面加载完成之后,下拉列表中已经有数据,这是怎么实现的呢?
&&&& 下面作以详解:
&&&& 1.&body onload=&fun()&&:在jsp的body里面有个onload事件,这个事件是在页面加载的时候起监听作用,调用某个函数(例如fun()函数)。因此我们可以通过fun函数从后台获取数据,显示在下拉列表中;
&&&& 2.fun()函数怎么写呢:可以通过ajax技术,从后台获取数据(数据格式可以是json格式或其他,本人倾向于json格式),通过解析,放在下拉列表中,代码如下:
function fun(){ &pre name=&code& class=&javascript&&
type:&POST&,
url: &statisticInfo_getCategorys.do?id=& + id,//请求的url,问号后面是所带的参数;
dataType:'json',
async:false,
success:function(data){
data = eval(data.root);//必须通过eval函数才能解析成json数据,否则会报错
} &/script&
ps:a.获取的json数据必须通过eval函数才能转化为真正的json数据,因为json数据格式本身就有一个大括号{},
如果不转的话,js会把数据当成一个语句块执行,转了之后才能当成表达式执行;
b.我们在后台获取的json数据格式一定要正确,否则不会执行到success:function(data){};里面。大家可
以把后台获取的json数据打印出来放到json在线解析中验证一下是否正确;在线解析地址:
/index.html
c:凡是字符串的一定带上双引号,数字的就没必要;
&&&&&&& 3.通过第二步已经获取到了json数据,那我们如何解析呢:
&&&&&&&&&& 观察json数据,凡是用[ ]框起来的就算是一个数组,既然是数组就可以对数组进行遍历(第二步经过eval&&&&&& 得到的data):
&&&&&&&&&& for(var i = 0; i & data. i++){
&&&&&&&&&&&& alert(data[i].name);
&&&&&&&&&&&& alert(data[i].id)
&&&&&&&&&& }
&&&&& 4.数据已经放到js页面,我们可以动态生成下拉列表:
&&&&&&&& a.select写成固定形式;
&&&&&& & //注意:在事件中如果要调用两个函数,要用分号隔开,但是两个函数执行有先后顺序;
&&&&&&& &select id=&category& onchange=&fun1();fun2()&&&/select&
&&&&&&& b.option动态生成:因为一个select中可以包含很多option(要根据后台获取的数据确定大小)&pre name=&code& class=&html&&
data = eval(data.root);
var selection= document.getElementById(&category&);
var firstOption=document.createElement(&option&);//创建
firstOption.value = &-1&;
firstOption.text = &--please select--&;
selection.appendChild(firstOption);
for (var i = 0; i & data. i++){
var _option = document.createElement(&option&);
if(i == 0){
_option.selected = 1;
_option.value = data[i].
&pre name=&code& class=&javascript&&&pre name=&code& class=&html&&
_option.text= data[i].
selection.appendChild(_option);
&span style=&background-color: rgb(255, 255, 255);&& &span style=&color:#3366FF;&&&strong&5.当我们点击下拉列表中的某一项时,如何得到所选中的项的id和text呢?当然下拉列表的select中有onchange
事件,当我们选中某项时会触发onchange事件,调用某个函数(例如:onchange=&fun3()&);&/strong&&/span&&/span&
a. 在fun3函数中获取value值(即生成的id号):
var Id = document.getElementById(&select中设置的id号,例如上面的& ).
b. 在fun3中获取text的值:我们可以把下拉列表想象成一个数组,以此获取text值:
var s = document.getElementById(&category&);
var name = s[s.selectedindex].
&span style=&color:#3333FF;&&&strong& 6.上传jsp中的代码作以参考:&/strong&&/span&
&pre name=&code& class=&html&&&%@ page language=&java& import=&java.util.*&
contentType=&text/charset=UTF-8& pageEncoding=&utf-8&%&
&%@ taglib uri=&/jsp/jstl/fmt& prefix=&fmt& %&
var apkId = new Array();
var downNumPerApk = new Array();
var apkName = new Array();
var data1 =
var data2 =
var categoryId =
function fun(){
/*加载下拉列表中的值*/
apkId = [];
apkName = [];
downNumPerApk = [];
//获取被选中的项的value;
categoryId = document.getElementById(&category&).
//获取每个类别对应的apkid
type:&POST&,
url:&statisticInfo_getSpecificApkId.do?categoryId=& + categoryId,
dataType:'json',
async:false,
success:function(data){
apkId = [];
apkName = [];
data1 = eval(data.root);
data2 = eval(data.root2);
for (var i = 0; i & data1. i++){
apkId.push(data1[i].key);
apkName[data1[i].key] = data2[i].
&body onload=&fun1();fun();totalApkOfPerCategory()&&
&!--下拉列表--&
&select id=&category& onchange=&fun();totalApkOfPerCategory()&&&/select&
&img 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& alt=&& /&
好了,大概就这些了,有不懂的可以讨论;
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