客户端javascript修改后获取DropDownList的值 [英] Getting the value of a DropDownList after client side javascript modification

问题描述

我在应用程序中有一个级联的DropDownList.级联下拉列表的内容很小，因此无需使用AJAX/JSON来访问数据库以获取内容，我只是在客户端javascript中这样做(这是数据):

I have a cascading DropDownList in an application. The contents of the cascading drop down list is small enough that there isn't a need to use AJAX/JSON to go to a database to get the content, I am just doing it in client side javascript like this (this is a subset of the data):

var val = typeList.value; 
var applyTimeList = document.getElementById('clientid');
for (var q=applyTimeList.options.length; q>=0; q--) 
    applyTimeList.options[q]=null;

if (val == 'AutoRoute')
{
    myEle = document.createElement('option') ;
    myEle.value = 'SOP Processed';
    myEle.text = 'SOP Processed';
    applyTimeList.add(myEle) ;
} else if (val == 'Tier1Retention') {
    myEle = document.createElement('option') ;
    myEle.value = 'Study Processed';
    myEle.text = 'Study Processed';
    applyTimeList.add(myEle);
    myEle = document.createElement('option') ;
    myEle.value = 'Study Restored';
    myEle.text = 'Study Restored';
    applyTimeList.add(myEle);
    myEle = document.createElement('option') ;
    myEle.value = 'Study Archived';
    myEle.text = 'Study Archived';
    applyTimeList.add(myEle) ;
}

当我尝试访问服务器端的DropDownList时，无法获取所选的值，它始终返回0作为索引:

When I attempt to access the DropDownList on the server side I can't get the value selected, it always returns 0 as the index:

int index = RuleApplyTimeDropDownList.SelectedIndex;

修改后如何获得在服务器端选择的值?

How can I get the value selected on the Server side after modification?

推荐答案

可以从DropDownList检索值，因为在客户端添加的值将不在ViewState中.正确的方法是:

The value can be retrieved from the DropDownList, because the values added on the client side will not be in the ViewState. The proper way to do this is :

string selectedVal = Request[RuleApplyTimeDropDownList.UniqueID].

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