Web Forms :: Creating Imagebutton Dynamically At Runtime?
Aug 5, 2010
I have a requirement whereby one or more image buttons need to be created in a user control at runtime. The number of buttons is determined from a database where a user can add one or more rows that contain an image for each button, so if a user adds 3 images to a table, 3 image buttons are created. Ive used this code but I get an error at runtime
The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.
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this is the usercontrol aspx
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I basically want one or more buttons to render within the div in the usercontrol. Ive only got the code written for one button at the moment while I test the rendering, eventually they will be rendered in a loop of records taken from a database. Whats the best way to do this ?
Newbie in using AJAX . Programming in C# and using SQL as a database. Here is my scenario. User selects a project and I want to display the subprojects related to that project. Here is the query I use to retrieve subprojects.
"SELECT SubProjectName,StartDate,Description FROM SubProject WHERE ProjectName'"+ddlProjectName.text+"';
Currently I store the results of the query in a Dataset. I want to get the SubProjectName in the Header of the Accordion and StartDate and Description values to the text box for each accordion. ( This is what I need to do in each accordian for each subproject)
I've an item template inside a grid which has a <asp:LinkButton/> inside it. I assign the text for the link button as
<%# Convert.ToString(Eval("Tags"))%>
Tags can have a string with multiple tags in it delimited by space. For eg. "sports", "sports cricket", "sports cricket sachin" are the examples of some possible tags.
I want to create a button for each tag inside the string. How can i create the controls (server control - linkbutton) dynamically during runtime inside the grid item template?
ive imagebuttons which created in runtime from database and i need to add them onclick or mouseover event but i failed imagebutton.click += new ImageClickEventHandler(imageButton_Click); im adding this when i created imagebuttons, what i need else also i tried javascript but its not firing too;
I need to create aspx pages on the fly or at the runtime.I read that creating a template page and posting content to the page would be a solution, in a few posts in the forum. Can i get information on this method.
i am creating some of the control at runtime according database values. problem is that when i click onto the button, if the text box is empty, the required field validator(genrated at runtime) show first time that the text box is empty. but one agin i click on to the button, it doest show any error messege and all of the control which i am genrating at run time are hiding when i see at the page source, no control is find there.
using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using AjaxControlToolkit; using click2install.controls; public partial class FeebackForm_Client : System.Web.UI.Page { HtmlGenericControl table = new HtmlGenericControl("table"); DataSet ds = new DataSet(); protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { CreateForm(); } } public void CreateForm() { ds = DBManager.ExecuteDataset("[FeedBack_FeedbackDetail_get]"); for (int i = 1; i < ds.Tables[0].Columns.Count - 1; i = i + 4) { //CreateControl(txtAddress.Text.ToString(), txtAddressRun, false, false, txtAddressToolTip.Text, txtAddressWaterMark.Text); string Name = ds.Tables[0].Rows[0][i].ToString().Replace(" ",""); if (Name != "") { TextBox txtControl = new TextBox(); //RequiredTextBox txtControl = new RequiredTextBox(); txtControl.ID = "txt" + Name; txtControl.CausesValidation = true; bool RequiredField; bool ToolTip; if (ds.Tables[0].Rows[0][i + 3].ToString() == "True") { RequiredField = true; } else RequiredField = false; if (ds.Tables[0].Rows[0][i + 1].ToString() != "") { ToolTip = true; } else ToolTip = false; string TooltipText = ds.Tables[0].Rows[0][i + 1].ToString(); string WaterMarkText = ds.Tables[0].Rows[0][i + 2].ToString(); CreateControl(Name, txtControl, RequiredField, ToolTip, TooltipText, WaterMarkText); } } HtmlGenericControl tr = new HtmlGenericControl("tr"); HtmlGenericControl td1 = new HtmlGenericControl("td"); HtmlGenericControl td2 = new HtmlGenericControl("td"); HtmlGenericControl td3 = new HtmlGenericControl("td"); HtmlGenericControl td4 = new HtmlGenericControl("td"); Button btnInsertRun = new Button(); btnInsertRun.Text = btnSubmit.Text.ToString(); btnInsertRun.ValidationGroup = "Check"; td2.Controls.Add(btnInsertRun); tr.Controls.Add(td1); tr.Controls.Add(td2); tr.Controls.Add(td3); tr.Controls.Add(td4); table.Controls.Add(tr); pnlPreview.Controls.Add(table); System.Threading.Thread.Sleep(500); ScriptManager.RegisterStartupScript(this, GetType(), Guid.NewGuid().ToString(), "Hide();", true); System.Threading.Thread.Sleep(500); ScriptManager.RegisterStartupScript(this, GetType(), Guid.NewGuid().ToString(), "ShowAddDisability()", true); } public void btnInsertRun_Click(object sender, System.EventArgs e) { CreateForm(); //ds = DBManager.ExecuteDataset("[FeedBack_FeedbackDetail_get]"); //TextBox txt1,txt2,txt3,txt4,txt5=new TextBox(); //objBox2 = this.Page.FindControl("objBox2") as TextBox; string ss = "txt" + ds.Tables[0].Rows[0][1].ToString(); //TextBox objTextBox = (TextBox)PnlControlPanel1.FindControl(strControlName); TextBox txt1 = new TextBox(); txt1 = (TextBox)this.Page.FindControl("txt" + ds.Tables[0].Rows[0][1].ToString()); //txt1=this.pnlContainer.FindControl("txt"+ds.Tables[0].Rows[0][1].ToString()) as TextBox; // txt2 = this.pnlContainer.FindControl("txt" + ds.Tables[0].Rows[0][5].ToString()) as TextBox; // txt3 = this.pnlContainer.FindControl("txt" + ds.Tables[0].Rows[0][9].ToString()) as TextBox; // txt4 = this.pnlContainer.FindControl("txt" + ds.Tables[0].Rows[0][13].ToString()) as TextBox; // txt5 = this.pnlContainer.FindControl("txt" + ds.Tables[0].Rows[0][17].ToString()) as TextBox; string fh = txt1.Text; //DBManager.ExecuteNonQuery("Feedback_FeedbackInsert", ds.Tables[0].Rows[0][1].ToString(), txt1.Text,ds.Tables[0].Rows[0][5].ToString(), txt2.Text,ds.Tables[0].Rows[0][9].ToString(), txt3.Text,ds.Tables[0].Rows[0][13].ToString(), txt4.Text,ds.Tables[0].Rows[0][17].ToString(), txt5.Text); Response.Write("Ho Gya"); } public void CreateControl(string Name, TextBox ControlID, bool RequiredField, bool Tooltip, string TooltipText, string WaterMarkText) { if (WaterMarkText == "") WaterMarkText = Name; HtmlGenericControl tr = new HtmlGenericControl("tr"); HtmlGenericControl td1 = new HtmlGenericControl("td"); HtmlGenericControl td2 = new HtmlGenericControl("td"); HtmlGenericControl td3 = new HtmlGenericControl("td"); HtmlGenericControl td4 = new HtmlGenericControl("td"); td1.InnerText = Name; ControlID.ValidationGroup = "Check"; //ControlID.ValidatorMessage = Name + " is Required Field"; //ControlID.ValidatorDisplayType = ValidatorDisplay.Dynamic; //ControlID.ValidatorEnableClientScript = true; td2.Controls.Add(ControlID); if (RequiredField == true) { //RequiredFieldValidator Valid = new RequiredFieldValidator(); //Valid.ID = "Valid" + Name; //Valid.ControlToValidate = ControlID.ID.ToString(); //Valid.ErrorMessage = Name + " is Required Field"; //Valid.Text = "*"; //Valid.Display = ValidatorDisplay.Dynamic; //Valid.EnableViewState = true; //Valid.SetFocusOnError = true; //Valid.Enabled = true; //Valid.EnableClientScript = true; //Valid.InitialValue = WaterMarkText; //Valid.ValidationGroup = "Check"; //td3.Controls.Add(Valid); } if (Tooltip == true) { HtmlGenericControl span = new HtmlGenericControl("span"); //span.Attributes.Add("class", "hotspot"); span.Attributes.Add("onmouseout", "tooltip.hide();"); span.Attributes.Add("onmouseover", "tooltip.show('" + TooltipText + "');"); HtmlImage img = new HtmlImage(); img.Src = "info.png"; span.Controls.Add(img); td4.Controls.Add(span); } //TextBoxWatermarkExtender WaterMark = new TextBoxWatermarkExtender(); //WaterMark.WatermarkText = WaterMarkText; //WaterMark.EnableClientState = true; //WaterMark.TargetControlID = ControlID.ID.ToString(); //WaterMark.Enabled = true; //WaterMark.ID = "WaterMark" + Name; //td1.Controls.Add(WaterMark); tr.Controls.Add(td1); tr.Controls.Add(td2); tr.Controls.Add(td3); tr.Controls.Add(td4); table.Controls.Add(tr); } } after rendring the page... <div id="pnlContainer"> <table><tbody><tr><td>Email</td><td><input type="text" id="txtEmail" name="txtEmail"></td><td></td><td><span onmouseover="tooltip.show('Email');" onmouseout="tooltip.hide();"><img src="info.png"></span></td></tr><tr><td>FirstName</td><td><input type="text" id="txtFirstName" name="txtFirstName"></td><td></td><td><span onmouseover="tooltip.show('First Name');" onmouseout="tooltip.hide();"><img src="info.png"></span></td></tr><tr><td>LastName</td><td><input type="text" id="txtLastName" name="txtLastName"></td><td></td><td><span onmouseover="tooltip.show('Last Name');" onmouseout="tooltip.hide();"><img src="info.png"></span></td></tr><tr><td>City</td><td><input type="text" id="txtCity" name="txtCity"></td><td></td><td><span onmouseover="tooltip.show('City');" onmouseout="tooltip.hide();"><img src="info.png"></span></td></tr><tr><td>Address</td><td><input type="text" id="txtAddress" name="txtAddress"></td><td></td><td><span onmouseover="tooltip.show('Address');" onmouseout="tooltip.hide();"><img src="info.png"></span></td></tr></tbody></table></div>
but after the click on to the button it shows only the container div..
I'm having problems binding controls at runtime. I've some user controls which need to be bind to the page when one of the dropdownlist selected index changed.
I can able to bind them properly but when if there is any postback event happens I am losing the controls and control values which were created runtime.
I have a web user control with dynamic LinkButton think an event in which you assign events to them (LinkButton.Click + = new EventHandler (Method)).The problem is that these events do not run, I did test creating and if you run statically.Why is it??I need to be created dynamically at runtime.For Examples :
for (int i = 0; i <= 5; i++) { Button boton = new Button();
I was wondering if it is possible to upload the .ascx and .ascx.vb of a custom usercontrol into my project directory at runtime via an upload control and then after that use through a database query point my page to load that newly uploaded control via (LoadControl(<newlyUploadedControl>)?
I've got a dynamically populated drop down list and was wondering if web crawlers are able to see dynamically rendered data? Here is my static html below, and the end result to the end user is a drop down list that's populated from my SQL query within my datasource below.
1. On OnCreatedUser event, I create a folder for each members, so that they can store their files inside those. The thing is I use User.Provider key as a folder name. Is this a good way to store? Is this OK from security view point. Otherwise I am planning to use the User.Username. Here are the codes inside the OnCreatedUser event.
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2. Inside these user folders I want to put web.config at run time [at the time of registration]. So that a member cannot access files of other members at any cost. Do you have any idea on creating web.config file at runtime inside these folders? Else if you can provide me any other options, I am eager to listen that. I don't want to call database frequently. So if there is any easy solution.
I have a DataTable where the columns are generated programmatically at runtime. I then bind this DataTable to a GridView. What I'm wondering is how I can create the GridView to accommodate this, and if it's not possible, how I can output the DataTable into nicely formatted HTML.
I have a Masterpage that has Treeview. You can select some nodes there. Based on the selection you get some items in the Default.aspx's Placeholder, you get a image and a linkbutton placed in a Panel. Like this :
This code is in the Default.aspx that has the Masterpage.
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There seems to be problem when i create the controllers at runtime, when the site does a postback, lets say if i click "Enska" in the treeview i get the results in the image above. Lets say that i then click "The Punk Panther" i get a error.
An error has occurred because a control with id 'ctl00$CPH_Main$ctl05' could not be located or a different control is assigned to the same ID after postback. If the ID is not assigned, explicitly set the ID property of controls that raise postback events to avoid this error.
Also, how would i go by making a event handler for the linkbutton at runtime, can i make one event handler that every linkbutton uses or what ? I want the folder and the linkbutton to be clickable and link to the same place, is it simpler to make the whole Panel clickable, if so, how would i get a "OnClick" event on it ?
Sometimes MS provides error message so silly that its hard to understnad and you feel like throwing away all things.
My Web.Config does not contain any entries of MemberShip, Role or Profile.
I want to create a membership provider dynamically through code at runtime. I wrote following code and it receives following error message. I don;t know how come machine.config error appears in my application. how annoying.
Parser Error Message: The connection name 'LocalSqlServer' was not found in the applications configuration or the connection string is empty.
