<选择>标记已从Binding dropdownlist中删除 [英] <select> tag is removed from design by Binding dropdownlist

问题描述

我是绑定下拉列表。

我的代码是

 <   asp：UpdatePanel     ID   =  upd1    runat   =  server   >  
 <   ContentTemplate  >  <   div     class   =  col-md-3 >  
  
 <   asp：标签    runat   =  server    ID   =  lblAllocationOrderNo   文字  = 分配订单编号 >  <   / asp：标签 >  
  
 
 <   asp：DropDownList     runat   =  server < span class =code-attribute>   ID   =  ddlAllocationOrderNo    CssClass   =   form-control input-sm >  
 <   / asp：DropDownList  >  
 
 
 
 <   asp：RequiredFieldValidator     ID   =  rfvAllocationOrd erNo    runat   =  server    ControlToValidate   =  ddlAllocationOrderNo  
   
                                                      < span class =code-attribute>             ValidationGroup   =  frmSelection  
   
                  < span class =code-attribute>                                                 ErrorMessage   = 分配否。必需    CssClass   =  fa text-red    SetFocusOnError   =  True   显示  = 动态  
   
            < span class =code-attribute>                          < span class =code-attribute>                             InitialValue   =  0 >  
 
 < ;   / asp：RequiredFieldValidator  >  
 
 
 <   / div  >  
 
 <   / ContentTemplate  > ;  
 <   / asp：UpdatePanel  >  

在绑定之前，源代码是

 <  选择    id   =  ContentPlaceHolder1_ddlAllocationOrderNo >  <   / select  >  

没有选项

绑定后给定代码

< pre lang =Javascript>



函数getAllocationOrderN（）{



试试{





var fromdate = $（'＃<％= txtFromDate.ClientID％>'）。val（）;

var todate = $（'＃<％= txtToDate.ClientID ％>'）。val（）;

var DFSO = $（'＃ContentPlaceHolder1_ddlDFSO：selected'）。val（）;





if（DFSO！=''& fromdate！=''& todate！=''）{





$ .ajax（

{

类型：POST，

contentType：application / json; charset = utf-8，

url：../ scm / Search_CS.ashx？ act = falloc& DFSO =+ DFSO +& fromdate =+ fromdate +& todate =+ todate，

data：{}，

dataType：json，

async：true，

选择器：'＃<％= ddlAllocationOrderNo.ClientID％>'

，

成功：功能（数据）{





$（[id * = ddlAllocationOrderNo] ）.empty （）;

for（var i = 0;我< data.length; i ++）{





$（[id * = ddlAllocationOrderNo]）。append（$（& lt; option> & lt; / option>）。val（data [i] .AllocValue）.html（data [i] .AllocationOrderNo））;

}



}

}）;



}

else {

$（select [id $ = ddlAllocationOrderNo]> option）。remove（）;

}

}

catch （e）{



}



}< / pre>



源代码是

 <  选项    value   =  0 > 选择一个<   / option  >  
 <  选项   值  =  1 >  123456 <   / option  >  

选择标签不存在。

解决方案

（'＃< ％= txtFromDate.ClientID％>'）。val（）;

var todate =

（'＃<％= txtToDate.ClientID％> '）.val（）;

var DFSO =

（'＃ContentPlaceHolder1_ddlDFSO：selected'）。val（）;





if（DFSO！=''& fromdate！=''& todate！=''）{

I am Binding dropdownlist.
My code is

<asp:UpdatePanel ID="upd1" runat="server" >
            <ContentTemplate> <div class="col-md-3">
                            
                                <asp:Label runat="server" ID="lblAllocationOrderNo" Text="Allocation Order No."></asp:Label>
                            

                            <asp:DropDownList runat="server" ID="ddlAllocationOrderNo" CssClass="form-control input-sm">
                            </asp:DropDownList>


                         
                            <asp:RequiredFieldValidator ID="rfvAllocationOrderNo" runat="server" ControlToValidate="ddlAllocationOrderNo"

                                ValidationGroup="frmSelection"

                                ErrorMessage="Allocation No. Required" CssClass="fa text-red" SetFocusOnError="True" Display="Dynamic"

                                InitialValue="0">
                            
                            </asp:RequiredFieldValidator>


                        </div>

            </ContentTemplate>
        </asp:UpdatePanel>

Before Binding it source code is

<select id="ContentPlaceHolder1_ddlAllocationOrderNo"></select>

there is no option
after Binding by given code
<pre lang="Javascript">

function getAllocationOrderN() {

try {


var fromdate = $('#<%=txtFromDate.ClientID%>').val();
var todate = $('#<%=txtToDate.ClientID%>').val();
var DFSO = $('#ContentPlaceHolder1_ddlDFSO :selected').val();


if (DFSO != '' & fromdate != '' & todate != '') {


$.ajax(
{
type: "POST",
contentType: "application/json; charset=utf-8",
url: "../scm/Search_CS.ashx?act=falloc&DFSO=" + DFSO + "&fromdate=" + fromdate + "&todate=" + todate,
data: "{}",
dataType: "json",
async: true,
selector: '#<%=ddlAllocationOrderNo.ClientID %>'
,
success: function (data) {


$("[id*=ddlAllocationOrderNo]").empty();
for (var i = 0; i < data.length; i++) {


$("[id*=ddlAllocationOrderNo]").append($("&lt;option>&lt;/option>").val(data[i].AllocValue).html(data[i].AllocationOrderNo));
}

}
});

}
else {
$("select[id$=ddlAllocationOrderNo] > option").remove();
}
}
catch (e) {

}

}</pre>

source code is

<option value="0">Select One</option>
<option value="1">123456</option>

select tag is not there.

解决方案

('#<%=txtFromDate.ClientID%>').val();
var todate =

('#<%=txtToDate.ClientID%>').val();
var DFSO =

('#ContentPlaceHolder1_ddlDFSO :selected').val();


if (DFSO != '' & fromdate != '' & todate != '') {

这篇关于&LT;选择&GT;标记已从Binding dropdownlist中删除的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！