[英]Selected items remains selected after postback in Jquery UI Multiselect widget
我试图在asp.net中创建一个GridView,它可以像Excel一样过滤gridview的每一列。 为此,我创建了一个Gridview并在GridView的每一列的标题上使用了Jquery multiselect小部件来进行过滤。
<cc1:GridView ID="gvDailyTracker" runat="server" CssClass="mGrid" CellSpacing="2" AutoGenerateColumns="false"
ShowFooter="false" AllowPaging="true" OnPageIndexChanging="gvDailyTracker_PageIndexChanging" OnRowDataBound="gvDailyTracker_RowDataBound"
OnRowCommand="gvDailyTracker_RowCommand" OnRowEditing="gvDailyTracker_RowEditing" OnSelectedIndexChanged="gvDailyTracker_SelectedIndexChanged"
OnDataBound="gvDailyTracker_DataBound">
<EmptyDataRowStyle BackColor="LightBlue" Width="1180" />
<EmptyDataTemplate>
No Data Found From The Current Selection,Please Select Appropriate Search Criteria.
</EmptyDataTemplate>
<Columns>
<asp:TemplateField SortExpression="DateProcessed" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White">
<HeaderTemplate>
<select id="ddlDateProcessed" name="test" runat="server" multiple="true" style="width: 100px;">
</select>
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblDateProcessed" runat="server" Text='<%#Eval("DateProcessed") %>' CssClass="GridContent" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField SortExpression="InvoiceFileName" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White">
<HeaderTemplate>
<select id="ddlInvoiceFilename" name="test" runat="server" multiple="true" style="width: 100px;">
</select>
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblInvoiceFileName" runat="server" Text='<%#Eval("InvoiceFileName") %>' CssClass="GridContent" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</cc1:GridView>
<script type="text/javascript">
$(document).ready(function () {
$("#MainContent_gvDailyTracker_ddlDateProcessed").multiselect({
SelectedText: 'DateProcessed',
noneSelectedText: 'DateProcessed',
close: function () {
var dateProcessed = $("#MainContent_gvDailyTracker_ddlDateProcessed").multiselect("getChecked").map(function () {
return this.value;
}).get();
document.getElementById('<%=txtddlDateProcessed.ClientID%>').value = dateProcessed;
document.getElementById('<%=btnPostBack.ClientID %>').click();
},
beforeopen: function () {
$("#MainContent_gvDailyTracker_ddlDateProcessed").multiselect("checkAll");
},
minWidth: 120
});
$("#MainContent_gvDailyTracker_ddlInvoiceFilename").multiselect({
SelectedText: 'InvoiceFileName',
noneSelectedText: 'InvoiceFileName',
close: function () {
var InvoiceFilename = $("#MainContent_gvDailyTracker_ddlInvoiceFilename").multiselect("getChecked").map(function () {
return this.value;
}).get();
document.getElementById('<%=txtddlInvoiceFileName.ClientID%>').value = InvoiceFilename;
document.getElementById('<%=btnPostBack.ClientID %>').click();
},
beforeopen: function () {
$("#MainContent_gvDailyTracker_ddlInvoiceFilename").multiselect("checkAll");
},
minWidth: 120
});
});
function test() {
BindAllMultiSelectData();
var dateProcessed = $("#MainContent_gvDailyTracker_ddlDateProcessed").multiselect("getChecked").map(function () {
return this.value;
}).get();
var InvoiceFilename = $("#MainContent_gvDailyTracker_ddlInvoiceFilename").multiselect("getChecked").map(function () {
return this.value;
}).get();
document.getElementById('<%=txtddlDateProcessed.ClientID%>').value = dateProcessed;
document.getElementById('<%=txtddlInvoiceFileName.ClientID%>').value = InvoiceFilename;
}
function BindAllMultiSelectData() {
$("#MainContent_gvDailyTracker_ddlDateProcessed").multiselect({
SelectedText: 'DateProcessed',
noneSelectedText: 'DateProcessed',
close: function () {
var dateProcessed = $("#MainContent_gvDailyTracker_ddlDateProcessed").multiselect("getChecked").map(function () {
return this.value;
}).get();
document.getElementById('<%=txtddlDateProcessed.ClientID%>').value = dateProcessed;
document.getElementById('<%=btnPostBack.ClientID %>').click();
},
minWidth: 120
});
$("#MainContent_gvDailyTracker_ddlInvoiceFilename").multiselect({
SelectedText: 'InvoiceFileName',
noneSelectedText: 'InvoiceFileName',
close: function () {
var InvoiceFilename = $("#MainContent_gvDailyTracker_ddlInvoiceFilename").multiselect("getChecked").map(function () {
return this.value;
}).get();
document.getElementById('<%=txtddlInvoiceFileName.ClientID%>').value = InvoiceFilename;
document.getElementById('<%=btnPostBack.ClientID %>').click();
},
minWidth: 120
});
</script>
用于过滤gridView的C#代码
protected void btnPostBack_Click(object sender, EventArgs e)
{
if (!txtddlDateProcessed.Text.Equals(null) && txtddlDateProcessed.Text != string.Empty)
{
string filter=txtddlDateProcessed.Text;
filter = filter.Replace(",", "','");
string strFilter="[DateProcessed]" + " in ('" + filter + "')";
FilterHeader(strFilter);
}
if (!txtddlInvoiceFileName.Text.Equals(null) && txtddlInvoiceFileName.Text != string.Empty)
{
string filter=txtddlInvoiceFileName.Text;
filter = filter.Replace(",", "','");
string strFilter="[InvoiceFileName]" + " in ('" + filter + "')";
FilterHeader(strFilter);
}
ScriptManager.RegisterStartupScript(this, this.GetType(), Guid.NewGuid().ToString(), "test();", true);
}
到目前为止,一切正常,我能够过滤网格视图。 现在,我真正想要的是在过滤网格视图之后,在“多选”小部件上进行的选择仍然保持不变。 目前,过滤后,所有多选项目均未选中。
注:-1。 我正在动态绑定多重选择。(该列值的不同记录绑定到多重选择)
private void BindHeaderDropDown(string columnName, DataTable dt, string controlName)
{
System.Web.UI.HtmlControls.HtmlSelect objControlName = (System.Web.UI.HtmlControls.HtmlSelect)gvDailyTracker.HeaderRow.FindControl(controlName);
DataView view=new DataView(dt);
DataTable distinctValues = view.ToTable(true, columnName);
objControlName.DataSource = distinctValues;
objControlName.DataTextField = columnName;
objControlName.DataValueField = columnName;
objControlName.DataBind();
}
在绑定网格后的页面加载中,我通过调用BindHeaderDropDown
函数来绑定BindHeaderDropDown
窗口小部件,并在使用选定值过BindHeaderDropDown
格视图之后,再次调用相同的函数,即BindHeaderDropDown
来绑定BindHeaderDropDown
。过滤后的功能,没有任何东西绑定到Multiselect,并且它是空白的,没有单个复选框项目。
请帮助我并指导我,我该怎么办? 提前致谢。
重新绑定Multiselect控件时,在每个回发(页面加载方法)中,这就是丢失用户选择的值的原因,因为您正在重新生成过滤器控件。
要保留用户的选择,可以更新重新绑定方法并添加Logic来检查它是“初始加载”还是“回发”。 如果是回发,则在重新绑定控件后,在相应的过滤器控件中手动添加/设置值。
希望它可以解决您的问题。 谢谢
private void BindHeaderDropDown(string columnName, DataTable dt, string controlName)
{
System.Web.UI.HtmlControls.HtmlSelect objControlName = (System.Web.UI.HtmlControls.HtmlSelect)gvDailyTracker.HeaderRow.FindControl(controlName);
DataView view=new DataView(dt);
DataTable distinctValues = view.ToTable(true, columnName);
objControlName.DataSource = distinctValues;
objControlName.DataTextField = columnName;
objControlName.DataValueField = columnName;
objControlName.DataBind();
// check if it is post-back
objControlName.Text = Latest User value;
}
更好的是,您可以将您的多选值保存在隐藏字段中,然后根据隐藏字段值再次在多选下拉列表中填充这些项目。
这种将值存储在隐藏字段中的方法
close: function (event, ui) {
var values = new Array();
$("#ddlAssignedTo").multiselect("getChecked").each(function (index, item) {
values.push($(item).val());
});
$("input[id*=hdnAssignTo]").val(values.join(","));
}
这是根据hiddenfield在multislect下拉列表中填充值的方法
function loadSelectedUsers() {
$("#ddlAssignedTo").multiselect("uncheckAll");
var listAssigned = $("#ctl00_MainContent_ddlAssignedTo option:selected").length;
if (listAssigned == 0) {
if ($("#<%=hdnAssignTo.ClientID%>").val() != null && $("#<%=hdnAssignTo.ClientID%>").val() != undefined && $("#<%=hdnAssignTo.ClientID%>").val() != "") {
var arrUserIdSelected = $("#<%=hdnAssignTo.ClientID%>").val().split(',');
if (arrUserIdSelected != null && arrUserIdSelected.length > 0) {
for (var iCount = 0; iCount < arrUserIdSelected.length; iCount++) {
$("#ddlAssignedTo").multiselect("widget").find("input:checkbox[value='" + arrUserIdSelected[iCount] + "']").attr("checked", "checked");
$("#ddlAssignedTo option[value='" + arrUserIdSelected[iCount] + "']").attr("selected", 1);
$("#ddlAssignedTo").multiselect("refresh");
}
}
}
}
}
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