单击提交按钮后，不会保留下拉列表选定值 [英] Dropdown selected value not retained after the submit button click

问题描述

我有两个下拉菜单选择任务和其他选择子任务....当我选择基于所选任务类别的子任务时，它保留在下拉列表...为此我将ViewStateMode更改为启用....当我点击我的提交按钮时，它从子任务下拉列表获取第一个值，并使用这些值填充数据库....



taskDrpDown- ViewStateMode：启用自动回复：True

subTaskDrpDown - ViewStateMode：启用AutopostBack：False



page_load还有（！IsPostback）{// code}



populateCategory {// code}



taskDrpDown_SelectedIndexedChanged {// populateSubCategory}



populateSubCategory {// code}



submit_click {//将所有条目提交到数据库的代码}



我在回发的地方出错了所有..... ??



请帮助!!



提前致谢！

I have two dropdowns select task and other select sub task....when i select sub task based on the selected task category it retains on the dropdown...for that i changed the ViewStateMode to enabled....However when i click on my submit button it takes the first value from the sub task dropdown and fills the database with those values....

taskDrpDown- ViewStateMode: Enabled Autopostback: True
subTaskDrpDown - ViewStateMode: Enabled AutopostBack: False

also page_load has(!IsPostback){//code}

populateCategory{//code}

taskDrpDown_SelectedIndexedChanged{//populateSubCategory}

populateSubCategory{//code}

submit_click{//code to submit all the entries to database}

Am i going wrong somewhere with the postback and all.....??

Please Help!!

Thanks in advance!

推荐答案

检查你是否在提交按钮点击后将值绑定到taskDrpDown。

你的下拉列表正在反弹，因此它无法保留所选的值。



你应该只设置dropdownlist.selecteditem =以前选择的项目

check if you are binding values to taskDrpDown after submit button click.
Your drop-down list is getting rebound and hence it would not able able to retain the selected value.

you should just set the dropdownlist.selecteditem =previously selected item

把if语句放在页面加载你绑定的地方这些下拉菜单如下



if（！IsPostBack）

{

//绑定代码dropdown1

//绑定下拉代码2

}

Put if statement on page load where you are binding these dropdowns like below

if(!IsPostBack)
{
//Bind Code of dropdown1
//Bind Code of dropdown2
}

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