嘗試在ASP.NET中的ListView中的代碼后面的文本框中分配值
[英]Attempting to assign values to TextBoxes in code behind in ListView in ASP.NET
問題描述
我試圖根據ListView中學生的用戶ID標簽值在ListView的TextBoxes中插入一個值。 在前端，每個列出的學生都有一個文本框，用於輸入成績。 以下是我編寫的代碼的一部分，該代碼試圖查找TextBox控件，檢索已經存在的結果並分配給與正確學生匹配的TextBox：
<div class="col-sm-12">
<div class="row moduleDrop">
<h2>Final module results</h2>
<h4>Select the degree programme:</h4>
<asp:Label ID="degreeProgValue" runat="server"></asp:Label>
<br />
<asp:SqlDataSource ID="degreeSelect" runat="server" ConnectionString="<%$ ConnectionStrings:UniString %>"
SelectCommand="SELECT pathway_years.id, (pathway_year + ' ' + pathway ) AS pathwayDetails FROM pathways INNER JOIN pathway_years ON pathways.id = pathway_years.pathway_id"></asp:SqlDataSource>
<asp:DropDownList ID="degreeProgDropDown" runat="server" Width="420" AutoPostBack="true"
DataSourceID="degreeSelect" DataTextField="pathwayDetails" DataValueField="id">
</asp:DropDownList>
</div>
</div>
<div class="col-sm-12">
<div class="row moduleDrop">
<h4>Select module:</h4>
<asp:Label ID="TBTest" runat="server" Visible="true"></asp:Label>
<br />
<asp:SqlDataSource ID="modSource" runat="server" ConnectionString="<%$ ConnectionStrings:UniString %>"
SelectCommand="SELECT DISTINCT module_on_pathway.module_id, modules.module_name FROM modules INNER JOIN module_on_pathway ON modules.id = module_on_pathway.module_id INNER JOIN pathway_years ON module_on_pathway.pathway_year_id = pathway_years.id INNER JOIN class ON pathway_years.id = class.pathway_year_id INNER JOIN classlist ON class.class_id = classlist.class_id INNER JOIN users ON classlist.user_id = users.id WHERE mandatory_module = 1 AND pathway_years.id = @pwayYearid UNION SELECT module_on_pathway.id, modules.module_name FROM modules INNER JOIN module_on_pathway ON modules.id = module_on_pathway.module_id INNER JOIN pathway_years ON module_on_pathway.pathway_year_id = pathway_years.id INNER JOIN class ON pathway_years.id = class.pathway_year_id INNER JOIN classlist ON class.class_id = classlist.class_id INNER JOIN chosen_modules_list ON classlist.classlist_id = chosen_modules_list.classlist_id INNER JOIN users ON classlist.user_id = users.id WHERE chosen_modules_list.module_on_pathway_id = module_on_pathway.id AND pathway_years.id = @pwayYearid">
<SelectParameters>
<asp:ControlParameter ControlID="degreeProgDropDown" Name="pwayYearid" />
</SelectParameters>
</asp:SqlDataSource>
<asp:DropDownList ID="modDropDown" runat="server" Width="420" AutoPostBack="true" EnableViewState="true"
DataSourceID="modSource" DataTextField="module_name" DataValueField="module_id">
</asp:DropDownList>
</div>
<br />
</div>
<div class="classList">
<h4>Select the student:</h4>
<br />
<asp:SqlDataSource ID="SQLStudentList" runat="server" ConnectionString="<%$ ConnectionStrings:UniString %>"
SelectCommand="SELECT students_profile.user_id, first_name, last_name FROM classlist
INNER JOIN students_profile ON classlist.user_id = students_profile.user_id
INNER JOIN class ON classlist.class_id = class.class_id
INNER JOIN pathway_years ON class.pathway_year_id = @pwayYearid
INNER JOIN module_on_pathway ON pathway_years.id = module_on_pathway.pathway_year_id
WHERE module_on_pathway.mandatory_module = 1
AND module_on_pathway.module_id = @modpwayid
UNION
SELECT students_profile.user_id, first_name, last_name FROM classlist
INNER JOIN students_profile ON classlist.user_id = students_profile.user_id
INNER JOIN class ON classlist.class_id = class.class_id
INNER JOIN pathway_years ON class.pathway_year_id = @pwayYearid
INNER JOIN module_on_pathway ON pathway_years.id = module_on_pathway.pathway_year_id
INNER JOIN chosen_modules_list ON classlist.classlist_id = chosen_modules_list.classlist_id
WHERE chosen_modules_list.module_on_pathway_id = module_on_pathway.id
AND module_on_pathway.module_id = @modpwayid">
<SelectParameters>
<asp:ControlParameter ControlID="degreeProgDropDown" Name="pwayYearid" />
<asp:ControlParameter Name="modpwayid" ControlID="modDropDown" />
</SelectParameters>
</asp:SqlDataSource>
<asp:ListView runat="server" OnItemDataBound="studentsListView_ItemDataBound" ID="studentsListView" DataSourceID="SQLStudentList">
<AlternatingItemTemplate>
<strong><span style="">Student Number:</strong>
<asp:Label ID="user_idLabel" runat="server" Text='<%# Eval("user_id") %>' />
<br />
<strong>Name:</strong>
<asp:Label ID="first_nameLabel" runat="server" Text='<%# Eval("first_name") %>' />
<asp:Label ID="last_nameLabel" runat="server" Text='<%# Eval("last_name") %>' />
<br />
<asp:TextBox ID="finalMarkAssignment" runat="server" Width="40"></asp:TextBox>
<asp:Label ID="gradeForStudent" runat="server" Visible="false"></asp:Label>
<br />
<br />
<asp:Button CssClass="btn btn-success" ID="submitModuleMark" OnClientClick="ShowLabel();" runat="server" Text="Submit Grade" OnClick="submitModuleMark_Click" />
<br />
<asp:Button CssClass="btn btn-success" ID="repeatSubmitModuleMark" OnClientClick="ShowLabel();" runat="server" Text="Submit repeat module grade" OnClick="repeatSubmitModuleMark_Click" />
<br />
<br />
</span>
</AlternatingItemTemplate>
<EditItemTemplate>
<span style="">user_id:
<asp:TextBox ID="user_idTextBox" runat="server" Text='<%# Bind("user_id") %>' />
<br />
first_name:
<asp:TextBox ID="first_nameTextBox" runat="server" Text='<%# Bind("first_name") %>' />
<br />
last_name:
<asp:TextBox ID="last_nameTextBox" runat="server" Text='<%# Bind("last_name") %>' />
<br />
<asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
<br />
<br />
</span>
</EditItemTemplate>
<EmptyDataTemplate>
<span>No data was returned.</span>
</EmptyDataTemplate>
<InsertItemTemplate>
<span style="">user_id:
<asp:TextBox ID="user_idTextBox" runat="server" Text='<%# Bind("user_id") %>' />
<br />
first_name:
<asp:TextBox ID="first_nameTextBox" runat="server" Text='<%# Bind("first_name") %>' />
<br />
last_name:
<asp:TextBox ID="last_nameTextBox" runat="server" Text='<%# Bind("last_name") %>' />
<br />
<asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
<br />
<br />
</span>
</InsertItemTemplate>
<ItemTemplate>
<span style="">
<strong>Student Number:</strong>
<asp:Label ID="user_idLabel" runat="server" Text='<%# Eval("user_id") %>' />
<br />
<strong>Name:</strong>
<asp:Label ID="first_nameLabel" runat="server" Text='<%# Eval("first_name") %>' />
<asp:Label ID="last_nameLabel" runat="server" Text='<%# Eval("last_name") %>' />
<br />
<asp:TextBox ID="finalMarkAssignment" runat="server" Width="40"></asp:TextBox>
<br />
<br />
<asp:Button CssClass="btn btn-success" ID="submitModuleMark" OnClientClick="ShowLabel();" runat="server" Text="Submit Grade" OnClick="submitModuleMark_Click" />
<br />
<asp:Button CssClass="btn btn-success" ID="repeatSubmitModuleMark" OnClientClick="ShowLabel();" runat="server" Text="Submit repeat module grade" OnClick="repeatSubmitModuleMark_Click" />
<br />
<br />
</span>
</ItemTemplate>
<LayoutTemplate>
<div id="itemPlaceholderContainer" runat="server" style="">
<span runat="server" id="itemPlaceholder" />
</div>
<div style="">
</div>
</LayoutTemplate>
<SelectedItemTemplate>
<span style="">user_id:
<asp:Label ID="user_idLabel" runat="server" Text='<%# Eval("user_id") %>' />
<br />
first_name:
<asp:Label ID="first_nameLabel" runat="server" Text='<%# Eval("first_name") %>' />
<br />
last_name:
<asp:Label ID="last_nameLabel" runat="server" Text='<%# Eval("last_name") %>' />
<br />
<br />
</span>
</SelectedItemTemplate>
</asp:ListView>
</div>
<div class="col-sm-12">
<br />
<asp:Label ID="changedFlag" runat="server" Visible="false"></asp:Label>
<asp:Label ID="assignmentIDValue" runat="server" Visible="false"></asp:Label>
<asp:Label ID="pOrF" runat="server" Visible="false"></asp:Label>
<asp:Label ID="EnterFinalMark" runat="server" Visible="false">Enter a final mark for this module</asp:Label>
<br />
<asp:Label ID="success" runat="server" Visible="false" Text="Grade has been changed successfully"></asp:Label>
<asp:Label ID="changedVAL" Visible="false" runat="server"></asp:Label>
</div>
</div>
1 個解決方案
解決方案1
0 2016-04-07 02:05:51
當您在TextBox TB上放置一個斷點時，進入該斷點時是否有一個值？
我懷疑您沒有將這段代碼放在可以為listview項進行數據綁定的方法中，因此您需要這樣做。 如果將其放在其他位置（例如在頁面加載時），它將無法找到各個文本框。
首先，您需要在頁面加載代碼中訂閱ListView的ItemDataBound事件。 您可以在前端代碼中聲明性地執行此操作
<asp:ListView ID="studentsListView" OnItemDataBound="listView_OnItemDataBound" runat="server"></asp:ListView>
或者您可以在后端代碼的頁面加載中完成此操作
studentsListView.ItemDataBound += listView_OnItemDataBound();
然后，對於每個項目，您都可以對其進行處理
protected void listView_OnItemDataBound(object sender, ListViewItemEventArgs e)
{
// get the button or any other control on the current row
TextBox tB = (TextBox) e.Item.FindControl("finalMarkAssignment");
if(tb != null)
{
// do something
}
}
從文件后面的代碼向ASP.NET C＃中的Listview控件動態添加子控件
[英]Dynamically adding child controls to listview control in ASP.NET C# from code behind file
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