丢失值后复选框中的Gridview [英] Gridview in checkbox after lost value
本文介绍了丢失值后复选框中的Gridview的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
您好我正在使用产品表。我在页面回发后选择了类别DropDownList，我选择了复选框，在页面回发后我选择了另一个DropdownList，我丢失了值Checkbox Checked。我该怎么做。
我尝试过的事情：
< asp：GridView ID = example CssClass = table table-striped table-bordered table-hover AutoGenerateColumns = false runat = server ClientIDMode = 静态 OnPreRender = example_PreRender OnRowEditing = example_RowEditing OnRowCancelingEdit = example_RowCancelingEdit OnRowDeleting = example_RowDeleting OnRowDataBound = example_RowDataBound >
< 列 >
< asp：TemplateField HeaderText = ÜrünSeç ItemStyle-Width = 50 >
< HeaderTemplate >
< asp：CheckBox ID = chkAll runat = server onclick = < span class =code-keyword> checkAll（this）; / >
< / HeaderTemplate >
< itemtemplate >
< asp：CheckBox ID = < span class =code-keyword> chcsec CssClass = form-control runat = server onclick = Check_Click（this）; / >
< asp：TemplateField HeaderText = ÜrünAd ItemStyle-Width = 100 < span class =code-keyword>>
< itemtemplate >
< asp：Label ID = lblUrun runat = 服务器 正文 =' <％ #Eval（ UrunAd）％>' >
< edititemtemplate >
< asp：TextBox ID = txturunad runat = server 文字 =' <％ #Eval（ UrunAd）％>' >
< < span class =code-leadattribute> asp：TemplateField 标题文字 = Stok ItemStyle-Width = 50 >
< itemtemplate >
< asp：Label ID = < span class =code-keyword> lblStok 样式 = padding：3px 5px; runat = server 文字 =' <％ #Eval（ Stok）％>' >
< edititemtemplate >
< asp：TextBox ID = txtstok 样式 = 填充：3px 5px; runat = server 正文 =' <％ #Eval（ Stok）％>' >
< asp： TemplateField HeaderText = Fiyat ItemStyle-Width = 50 >
< span class =code-keyword>< itemtemplate >
< asp：标签 ID = txtfiyat 样式 = 填充：3px 5px; CssClass = form-control runat = 服务器 >
< edititemtemplate > ;
< asp：TextBox ID = txtfiyat 样式 = 填充：3px 5px; runat = server < span class =code-attribute> CssClass = 表格控制 >
< asp：TemplateField HeaderText = Adet ItemStyle-Width = 50 >
< itemtemplate >
< asp：标签 ID = txtAdet 样式 = 填充：3px 5px; CssClass = form-control runat = 服务器 >
< edititemtemplate > ;
< asp：TextBox ID = txtAdet runat = server 样式 = 填充：3px 5px; CssClass = form-c ontrol >
< asp：TemplateField HeaderText = ElemanSeç ItemStyle-Width = 100 >
< itemtemplate >
< asp：DropDownList ID = drpEleman CssClass = form-control runat = 服务器 >
< asp：TemplateField < span class =code-attribute> HeaderText = Eleman Adet ItemStyle-Width = 50 >
< itemtemplate >
< asp：标签 ID = txtElemanAdet 样式 = 填充：3px 5px; CssClass = form-control runat = server >
< edititemtemplate >
< asp：Tex tBox ID = txtElemanAdet runat = server 样式 = 填充：3px 5px; CssClass = 表格控制 >
< asp：TemplateField HeaderText < span class =code-keyword> = Eleman Fiyat ItemStyle-Width = 50 >
< itemtemplate >
< asp：标签 ID = txtElemanFiyat 风格 = 填充：3px 5px; CssClass = form-control < span class =code-attribute> runat = 服务器 >
< edititemtemplate >
< asp：TextBox ID = txtElemanFiyat runat = server 样式 = 填充：3px 5px; CssClass = 表格 - control >
< asp：CommandField ButtonType = 链接 ShowEditButton = true ShowDeleteButton = true ItemStyle-Width = 150 / >
解决方案
我同意上面的成员，这就是网络的本质。 Web应用程序是无状态的，您必须做一些事情来保持驻留在普通网格或分页网格中的
CheckBox 的状态。您必须跟踪所选页面和选中的 CheckBox 并将其存储在某个地方，例如 ViewState / 会话以便您在回发时可以引用它们。以下是您可以参考的一个示例：保留州在ASP.Net GridView控件中进行分页时的复选框 [ ^ ]
< asp：gridview id =example cssclass =table table-striped table-bordered table-hoverautogeneratecolumns =falsedatakeynames =IDrunat =serverclientidmode =Staticonprerender =example_PreRenderonrowediting =example_RowEditingonrowcancelingedit =example_RowCancelingEdit onrowdeleting =example_RowDeletingonrowdatabound =example_RowDataBoundondatabound =example_DataBound>
< columns>
< asp：templatefield headertext =ÜrünSeçitemstyle-width =50>
< itemtemplate>
< asp：checkbox id =chcseccssclass =form-controlrunat =serverautopostback =true>
< / asp：checkbox>< / itemtemplate>
< / asp：templatefield>
< asp：templatefield headertext =ÜrünAditemstyle-width =100>
< itemtemplate>
< asp：label id =lblUrunrunat =servertext =<％＃Eval（UrunAd）％>>< / asp：label>
< / itemtemplate>
< edititemtemplate>
< asp：textbox id =txturunadrunat =servertext =<％＃Eval（UrunAd）％>>< / asp：textbox>
< / edititemtemplate>
< / asp：templatefield>
< asp：templatefield headertext =Stokitemstyle-width =50>
< itemtemplate>
< asp：label id =lblStokstyle =padding：3px 5px; runat =servertext =<％＃Eval（Stok）％>>< / asp：label>
< / itemtemplate>
< edititemtemplate>
< asp：textbox id =txtstokstyle =padding：3px 5px; runat =servertext =<％＃Eval（Stok）％>>< / asp：textbox>
< / edititemtemplate>
< / asp：templatefield>
< asp：templatefield headertext =Fiyatitemstyle-width =50>
< itemtemplate>
< asp：label id =txtfiyatstyle =padding：3px 5px; cssclass =form-controlrunat =server> 500< / asp：label>
< / itemtemplate>
< edititemtemplate>
< asp：textbox id =txtfiyatstyle =padding：3px 5px; runat =servercssclass =form-control>< / asp：textbox>
< / edititemtemplate>
< / asp：templatefield>
< asp：templatefield headertext =Adetitemstyle-width =50>
< itemtemplate>
< asp：label id =txtAdetstyle =padding：3px 5px; cssclass =form-controlrunat =server>< / asp：label>
< / itemtemplate>
< edititemtemplate>
< asp：textbox id =txtAdetrunat =serverstyle =padding：3px 5px;的CssClass = 形式控制 >< / ASP：文本框>
< / edititemtemplate>
< / asp：templatefield>
< asp：templatefield headertext =ElemanSeçitemstyle-width =100>
< itemtemplate>
< asp：dropdownlist id =drpElemancssclass =form-controlrunat =server>< / asp：dropdownlist>
< / itemtemplate>
< / asp：templatefield>
< asp：templatefield headertext =Eleman Adetitemstyle-width =50>
< itemtemplate>
< asp：label id =txtElemanAdetstyle =padding：3px 5px; cssclass =form-controlrunat =server>< / asp：label>
< / itemtemplate>
< edititemtemplate>
< asp：textbox id =txtElemanAdetrunat =serverstyle =padding：3px 5px;的CssClass = 形式控制 >< / ASP：文本框>
< / edititemtemplate>
< / asp：templatefield>
< asp：templatefield headertext =Eleman Fiyatitemstyle-width =50>
< itemtemplate>
< asp：label id =txtElemanFiyatstyle =padding：3px 5px; cssclass =form-controlrunat =server>< / asp：label>
< / itemtemplate>
< edititemtemplate>
< asp：textbox id =txtElemanFiyatrunat =serverstyle =padding：3px 5px;的CssClass = 形式控制 >< / ASP：文本框>
< / edititemtemplate>
< / asp：templatefield>
< asp：commandfield buttontype =Linkshowsitbutton =trueshowdeletebutton =trueitemstyle-width =150>
< / asp：commandfield>< / columns>
< / asp：gridview>
------------ -------------------------------------------------- ----------------------
if（！Page .IsPostBack）
{
// Uruns（）;
// Projes（）;
// Siparislers（）;
Elemans（）;
Musteris（）;
Kategoris（）;
}
else
{
List< object> datakeys = ViewState [datakeys]！= null？
（List< object>）ViewState [datakeys]：new List< object>（）;
foreach（示例中的GridViewRow行。行）
if（（（CheckBox）row.FindControl（chcsec））。已检查）
{
datakeys。添加（example.DataKeys [row.RowIndex]。价值）;
}
else
{
datakeys.Remove（example.DataKeys [row.RowIndex] .Value）;
}
ViewState [datakeys] = datakeys;
}
------------------ -----------------------------------------
protected void example_DataBound（object sender，EventArgs e）
{
//Session.Add(\"arrcon，arr）;
if（example.Rows.Count> 0&& ViewState [datakeys]！= null）
{
List< object> datakeys =（List< object>）ViewState [datakeys];
foreach (GridViewRow row in example.Rows)
((CheckBox)row.FindControl(\"chcsec\")).Checked = datakeys.Contains(example.DataKeys[row.RowIndex].Value);
}
}
protected void btnTopla_Click(object sender, EventArgs e)
{
if (example.Rows.Count > 0 && ViewState[\"datakeys\"] != null)
{
int sonuc = 0;
List<object> datakeys = (List<object>)ViewState[\"datakeys\"];
int i = 0;
foreach (GridViewRow row in example.Rows)
{
((CheckBox)row.FindControl(\"chcsec\")).Checked = datakeys.Contains(example.DataKeys[row.RowIndex].Value);
var lblFiyat = row.FindControl(\"txtfiyat\") as Label;
int sayi1 = Convert.ToInt32(lblFiyat.Text);
i ++;
sonuc = sayi1 * i;
}
txtToplamfiyat.Text = sonuc.ToString();
}
}
Hi I am using Product Table. I choise Category DropDownList after page is postback and I choise checkbox and I choise another DropdownList after page is postback and I lost value Checkbox Checked. How can I do example.
What I have tried:
<asp:GridView ID="example" CssClass="table table-striped table-bordered table-hover" AutoGenerateColumns="false" runat="server" ClientIDMode="Static" OnPreRender="example_PreRender" OnRowEditing="example_RowEditing" OnRowCancelingEdit="example_RowCancelingEdit" OnRowDeleting="example_RowDeleting" OnRowDataBound="example_RowDataBound">
<columns>
<asp:TemplateField HeaderText="Ürün Seç" ItemStyle-Width="50">
<HeaderTemplate>
<asp:CheckBox ID="chkAll" runat="server" onclick="checkAll(this);" />
</HeaderTemplate>
<itemtemplate>
<asp:CheckBox ID="chcsec" CssClass="form-control" runat="server" onclick="Check_Click(this);" />
<asp:TemplateField HeaderText="Ürün Ad" ItemStyle-Width="100">
<itemtemplate>
<asp:Label ID="lblUrun" runat="server" Text='<%# Eval("UrunAd") %>'>
<edititemtemplate>
<asp:TextBox ID="txturunad" runat="server" Text='<%# Eval("UrunAd") %>'>
<asp:TemplateField HeaderText="Stok" ItemStyle-Width="50">
<itemtemplate>
<asp:Label ID="lblStok" Style="padding: 3px 5px;" runat="server" Text='<%# Eval("Stok") %>'>
<edititemtemplate>
<asp:TextBox ID="txtstok" Style="padding: 3px 5px;" runat="server" Text='<%# Eval("Stok") %>'>
<asp:TemplateField HeaderText="Fiyat" ItemStyle-Width="50">
<itemtemplate>
<asp:Label ID="txtfiyat" Style="padding: 3px 5px;" CssClass="form-control" runat="server">
<edititemtemplate>
<asp:TextBox ID="txtfiyat" Style="padding: 3px 5px;" runat="server" CssClass="form-control">
<asp:TemplateField HeaderText="Adet" ItemStyle-Width="50">
<itemtemplate>
<asp:Label ID="txtAdet" Style="padding: 3px 5px;" CssClass="form-control" runat="server">
<edititemtemplate>
<asp:TextBox ID="txtAdet" runat="server" Style="padding: 3px 5px;" CssClass="form-control">
<asp:TemplateField HeaderText="Eleman Seç" ItemStyle-Width="100">
<itemtemplate>
<asp:DropDownList ID="drpEleman" CssClass="form-control" runat="server">
<asp:TemplateField HeaderText="Eleman Adet" ItemStyle-Width="50">
<itemtemplate>
<asp:Label ID="txtElemanAdet" Style="padding: 3px 5px;" CssClass="form-control" runat="server">
<edititemtemplate>
<asp:TextBox ID="txtElemanAdet" runat="server" Style="padding: 3px 5px;" CssClass="form-control">
<asp:TemplateField HeaderText="Eleman Fiyat" ItemStyle-Width="50">
<itemtemplate>
<asp:Label ID="txtElemanFiyat" Style="padding: 3px 5px;" CssClass="form-control" runat="server">
<edititemtemplate>
<asp:TextBox ID="txtElemanFiyat" runat="server" Style="padding: 3px 5px;" CssClass="form-control">
<asp:CommandField ButtonType="Link" ShowEditButton="true" ShowDeleteButton="true" ItemStyle-Width="150" />
解决方案
You have to store the checkbox indexes or something to recognize them somewhere may be in a Session or ViewState property. While loading the grid, inside RowDatabound, you can check that checkbox if it is present in the session, simple.
I agree with the member above, that's the nature of the web. Web Apps are stateless and you have to do something to persist the state of theCheckBoxthat resides in a normal grid or paged grid. You'll have to track the selected page and theCheckBoxthat was selected and store it somewhere likeViewState/Sessionso that you can reference them back when it postbacks. Here's one example that you can refer: Preserving state of Checkboxes while paging in ASP.Net GridView Control[^]
<asp:gridview id="example" cssclass="table table-striped table-bordered table-hover" autogeneratecolumns="false" datakeynames="ID" runat="server" clientidmode="Static" onprerender="example_PreRender" onrowediting="example_RowEditing" onrowcancelingedit="example_RowCancelingEdit" onrowdeleting="example_RowDeleting" onrowdatabound="example_RowDataBound" ondatabound="example_DataBound"> <columns> <asp:templatefield headertext="Ürün Seç" itemstyle-width="50"> <itemtemplate> <asp:checkbox id="chcsec" cssclass="form-control" runat="server" autopostback="true"> </asp:checkbox></itemtemplate> </asp:templatefield> <asp:templatefield headertext="Ürün Ad" itemstyle-width="100"> <itemtemplate> <asp:label id="lblUrun" runat="server" text="<%# Eval("UrunAd") %>"></asp:label> </itemtemplate> <edititemtemplate> <asp:textbox id="txturunad" runat="server" text="<%# Eval("UrunAd") %>"></asp:textbox> </edititemtemplate> </asp:templatefield> <asp:templatefield headertext="Stok" itemstyle-width="50"> <itemtemplate> <asp:label id="lblStok" style="padding: 3px 5px;" runat="server" text="<%# Eval("Stok") %>"></asp:label> </itemtemplate> <edititemtemplate> <asp:textbox id="txtstok" style="padding: 3px 5px;" runat="server" text="<%# Eval("Stok") %>"></asp:textbox> </edititemtemplate> </asp:templatefield> <asp:templatefield headertext="Fiyat" itemstyle-width="50"> <itemtemplate> <asp:label id="txtfiyat" style="padding: 3px 5px;" cssclass="form-control" runat="server">500</asp:label> </itemtemplate> <edititemtemplate> <asp:textbox id="txtfiyat" style="padding: 3px 5px;" runat="server" cssclass="form-control"></asp:textbox> </edititemtemplate> </asp:templatefield> <asp:templatefield headertext="Adet" itemstyle-width="50"> <itemtemplate> <asp:label id="txtAdet" style="padding: 3px 5px;" cssclass="form-control" runat="server"></asp:label> </itemtemplate> <edititemtemplate> <asp:textbox id="txtAdet" runat="server" style="padding: 3px 5px;" cssclass="form-control"></asp:textbox> </edititemtemplate> </asp:templatefield> <asp:templatefield headertext="Eleman Seç" itemstyle-width="100"> <itemtemplate> <asp:dropdownlist id="drpEleman" cssclass="form-control" runat="server"></asp:dropdownlist> </itemtemplate> </asp:templatefield> <asp:templatefield headertext="Eleman Adet" itemstyle-width="50"> <itemtemplate> <asp:label id="txtElemanAdet" style="padding: 3px 5px;" cssclass="form-control" runat="server"></asp:label> </itemtemplate> <edititemtemplate> <asp:textbox id="txtElemanAdet" runat="server" style="padding: 3px 5px;" cssclass="form-control"></asp:textbox> </edititemtemplate> </asp:templatefield> <asp:templatefield headertext="Eleman Fiyat" itemstyle-width="50"> <itemtemplate> <asp:label id="txtElemanFiyat" style="padding: 3px 5px;" cssclass="form-control" runat="server"></asp:label> </itemtemplate> <edititemtemplate> <asp:textbox id="txtElemanFiyat" runat="server" style="padding: 3px 5px;" cssclass="form-control"></asp:textbox> </edititemtemplate> </asp:templatefield> <asp:commandfield buttontype="Link" showeditbutton="true" showdeletebutton="true" itemstyle-width="150"> </asp:commandfield></columns> </asp:gridview>
------------------------------------------------------------------------------------
if (!Page.IsPostBack) { //Uruns(); //Projes(); //Siparislers(); Elemans(); Musteris(); Kategoris(); } else { List<object> datakeys = ViewState["datakeys"] != null ? (List<object>)ViewState["datakeys"] : new List<object>(); foreach (GridViewRow row in example.Rows) if (((CheckBox)row.FindControl("chcsec")).Checked) { datakeys.Add(example.DataKeys[row.RowIndex].Value); } else { datakeys.Remove(example.DataKeys[row.RowIndex].Value); } ViewState["datakeys"] = datakeys; }
-----------------------------------------------------------
protected void example_DataBound(object sender, EventArgs e) { //Session.Add("arrcon", arr); if (example.Rows.Count > 0 && ViewState["datakeys"] != null) { List<object> datakeys = (List<object>)ViewState["datakeys"]; foreach (GridViewRow row in example.Rows) ((CheckBox)row.FindControl("chcsec")).Checked = datakeys.Contains(example.DataKeys[row.RowIndex].Value); } } protected void btnTopla_Click(object sender, EventArgs e) { if (example.Rows.Count > 0 && ViewState["datakeys"] != null) { int sonuc = 0; List<object> datakeys = (List<object>)ViewState["datakeys"]; int i = 0; foreach (GridViewRow row in example.Rows) { ((CheckBox)row.FindControl("chcsec")).Checked = datakeys.Contains(example.DataKeys[row.RowIndex].Value); var lblFiyat = row.FindControl("txtfiyat") as Label; int sayi1 = Convert.ToInt32(lblFiyat.Text); i++; sonuc = sayi1 * i; } txtToplamfiyat.Text = sonuc.ToString(); } }
这篇关于丢失值后复选框中的Gridview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！
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