How to Find Child Controls That Are Located in The Template of a Parent Control

zhaozj2021-02-16  62

Summaryto find child controls That area located in Template of a pent control, you can use the

FindControl method or the

Cells Collection Index. However, The

TemplateColumn column and the

BoundColumn Column Are Different When You Try To Use

FindControl method or the

Cells Collection Index To Reference A Particular Control in The Cells of a Parent Control.

. In a BoundColumn column, the cell always contains a single control Therefore, you can use 0 as the index For example, 0 is the index in the following code:. String ProductName = ((TextBox) e.Item.Cells [3] .Controls [0]) Text;. In a TemplateColumn column, the controls are interspersed with literal controls Therefore, the previous blank space makes up a literal control In this case, the FindControl method must be used with the ControlID parameter as shown.. In The Following Code: Bool Discon = ((Checkbox) E.Item.FindControl ("ControlID")). Checked; Note The Control Pableholder is the id of the control.

More inforationto use the the

FindControl method or the

Cells Collection Index To Find A Child Control in a Parent Control, Follow these Steps:

Start Microsoft Visual Studio .NET Create a new Microsoft ASP.NET Web application project that is named FindControl by using Microsoft Visual C # .NET. By default, WebForm1.aspx is created. To add a DataGrid control to the WebForm1.aspx page, replace the existing code with the following code: <% @ Page language = "c #" Codebehind = "WebForm2.aspx.cs" AutoEventWireup = "false" Inherits = "FindControl.WebForm2"%> WebForm1 </ title> </ head> <body ms_positioning = "gridLayout"> <form id = "Webform2" method = "post" runat = "server"> <ask: dataGrid id = "mydataGrid" runat = "server" autogeneratecolumns = "False" OnEditCommand = "MyDataGrid_Edit" OnCancelCommand = "MyDataGrid_Cancel" OnUpdateCommand = "MyDataGrid_Update" OnDeleteCommand = "MyDataGrid_Delete" DataKeyField = "ProductID"> <Columns> <asp: EditCommandColumn ButtonType = "LinkButton" UpdateText = "Update" CancelText = "Cancel "Edittext =" edit "> </ asp: editcommandcolumn> <ask: buttoncolumn text =" delete "CommandName =" delete "> </ asp: buttoncolumn> <ask: Boundcol umn DataField = "ProductID" ReadOnly = "True" HeaderText = "ProductID"> </ asp: BoundColumn> <asp: BoundColumn DataField = "ProductName" HeaderText = "ProductName"> </ asp: BoundColumn> <asp: TemplateColumn HeaderText = "Discontinued"> <itemtemplate> <ask: checkbox id = discontinued runat =</p> <p>Server "Checked = '<% # databinder.eval (" discontinued ")%>'> </ asp: checkbox> </ itemtemplate> </ asp: templateColumn> </ columns> </ asp: datagrid> </ form> </ body> </ HTML> To add the DataGrid_Update and the DataBind methods, replace the existing code in the WebForm1.aspx.cs file with the following code: using System; using System.Collections; using System.Data Using system.web; using system.web.ui; using system.web.ui.webcontrols; using system.data.sqlclient; namespace findcontrol {/// <summary> /// summary description for webform2. /// < / summary> public class WebForm2: System.Web.UI.Page {protected System.Web.UI.WebControls.DataGrid myDataGrid; DataSet ds = new DataSet (); private void Page_Load (object sender, System.EventArgs e) {SqlConnection myConnection = new SqlConnection ( "server = databaseserver; uid = userid; pwd = pwd; database = northwind;"); SqlDataAdapter myCommand = new SqlDataAdapter ( "select * from Products", myConnection); myCommand.Fill (ds, "Products") MyDataGrid.da taSource = ds.Tables [ "Products"] DefaultView;. MyDataGrid.DataBind ();} protected void MyDataGrid_Update (Object sender, DataGridCommandEventArgs e) {string ProductName = ((TextBox) e.Item.Cells [3] .Controls [0 ]). TEXT; BOOL Discon = ((Checkbox) E.Item.FindControl ("discontinued")). Checked; response.write ("<b> 'productname' =" productname "| | 'discontinued' status =" Discon.toT7tring () "</ b>"); bindgrid ();</p></div><div class="text-center mt-3 text-grey"> 转载请注明原文地址:https://www.9cbs.com/read-17489.html</div><div class="plugin d-flex justify-content-center mt-3"></div><hr><div class="row"><div class="col-lg-12 text-muted mt-2"><i class="icon-tags mr-2"></i><span class="badge border border-secondary mr-2"><h2 class="h6 mb-0 small"><a class="text-secondary" href="tag-2.html">9cbs</a></h2></span></div></div></div></div><div class="card card-postlist border-white shadow"><div class="card-body"><div class="card-title"><div class="d-flex justify-content-between"><div><b>New Post</b>(<span class="posts">0</span>) </div><div></div></div></div><ul class="postlist list-unstyled"> </ul></div></div><div class="d-none threadlist"><input type="checkbox" name="modtid" value="17489" checked /></div></div></div></div></div><footer class="text-muted small bg-dark py-4 mt-3" id="footer"><div class="container"><div class="row"><div class="col">CopyRight © 2020 All Rights Reserved </div><div class="col text-right">Processed: <b>0.051</b>, SQL: <b>9</b></div></div></div></footer><script src="./lang/en-us/lang.js?2.2.0"></script><script src="view/js/jquery.min.js?2.2.0"></script><script src="view/js/popper.min.js?2.2.0"></script><script src="view/js/bootstrap.min.js?2.2.0"></script><script src="view/js/xiuno.js?2.2.0"></script><script src="view/js/bootstrap-plugin.js?2.2.0"></script><script src="view/js/async.min.js?2.2.0"></script><script src="view/js/form.js?2.2.0"></script><script> var debug = DEBUG = 0; var url_rewrite_on = 1; var url_path = './'; var forumarr = {"1":"Tech"}; var fid = 1; var uid = 0; var gid = 0; xn.options.water_image_url = 'view/img/water-small.png'; </script><script src="view/js/wellcms.js?2.2.0"></script><a class="scroll-to-top rounded" href="javascript:void(0);"><i class="icon-angle-up"></i></a><a class="scroll-to-bottom rounded" href="javascript:void(0);" style="display: inline;"><i class="icon-angle-down"></i></a></body></html><script> var forum_url = 'list-1.html'; var safe_token = '0Owv9bTCjEsZvGqzzcT8TK9vlLS4rRIJFJNNE2ai9yVoyNe4yA1nXgUUD2dVZ1FB6STpMp7zCnpwvC5lJg4yFg_3D_3D'; var body = $('body'); body.on('submit', '#form', function() { var jthis = $(this); var jsubmit = jthis.find('#submit'); jthis.reset(); jsubmit.button('loading'); var postdata = jthis.serializeObject(); $.xpost(jthis.attr('action'), postdata, function(code, message) { if(code == 0) { location.reload(); } else { $.alert(message); jsubmit.button('reset'); } }); return false; }); function resize_image() { var jmessagelist = $('div.message'); var first_width = jmessagelist.width(); jmessagelist.each(function() { var jdiv = $(this); var maxwidth = jdiv.attr('isfirst') ? first_width : jdiv.width(); var jmessage_width = Math.min(jdiv.width(), maxwidth); jdiv.find('img, embed, iframe, video').each(function() { var jimg = $(this); var img_width = this.org_width; var img_height = this.org_height; if(!img_width) { var img_width = jimg.attr('width'); var img_height = jimg.attr('height'); this.org_width = img_width; this.org_height = img_height; } if(img_width > jmessage_width) { if(this.tagName == 'IMG') { jimg.width(jmessage_width); jimg.css('height', 'auto'); jimg.css('cursor', 'pointer'); jimg.on('click', function() { }); } else { jimg.width(jmessage_width); var height = (img_height / img_width) * jimg.width(); jimg.height(height); } } }); }); } function resize_table() { $('div.message').each(function() { var jdiv = $(this); jdiv.find('table').addClass('table').wrap('<div class="table-responsive"></div>'); }); } $(function() { resize_image(); resize_table(); $(window).on('resize', resize_image); }); var jmessage = $('#message'); jmessage.on('focus', function() {if(jmessage.t) { clearTimeout(jmessage.t); jmessage.t = null; } jmessage.css('height', '6rem'); }); jmessage.on('blur', function() {jmessage.t = setTimeout(function() { jmessage.css('height', '2.5rem');}, 1000); }); $('#nav li[data-active="fid-1"]').addClass('active'); </script>