CODEWITHSUNDEEP
c#asp.nethtml
Ankur Monga
Ankur Monga

Reputation: 53

Find div at run time at server side in c#

Hye all.

i have div in index.aspx page like this

<div id="MainDiv" runat="server">

and i am creating div from server side(At run time) like 

 for (Int32 i = 0; i < 4; i++)
    {

        //Create here divFinal
        HtmlGenericControl divFinal = new HtmlGenericControl("div");
        divFinal.ID = i.ToString();

        divFinal.Attributes.Add("class", "column");


        mainDiv.Controls.Add(divFinal);
        //add to maindiv


        HtmlGenericControl div = new HtmlGenericControl("div");
        div.ID = "t_e_" + i.ToString() + "_a";
        div.Style["background-color"] = "#CFD8E6";
        div.Attributes.Add("class", "grid");
        div.Attributes.Add("onclick", "OnMouseDownDiv(this)");

        div.Attributes.Add("onmouseover", "OnMouseDown(this)");
        div.Attributes.Add("onmouseout", "OnMouseUp(this)");
        divFinal.Controls.Add(div);

        // add to dvfinal


    }

After gen rate its look like this in HTML form

 <div id="mainDiv"><div id="0" class="column"><div id="t_e_0_a"></div></div><div id="1" class="column"><div id="t_e_1_a"></div></div></div>

Now I need to find div id t_e_0_a inside main Divdiv.

HtmlGenericControl div = 
    ((HtmlGenericControl)showdiv.FindControl("0"));

But its give me error....

Upvotes: 5

Views: 22278

Answers (2)

Hiren Desai
Hiren Desai

Reputation: 1091

you should have tried with recursive function that how Page.FindControl works.

private Control getFollowingControl(Control c, string key,out Control returnControl)
{        
    if(c.hasChild)
    {
        foreach(Control item in c.controls)
        {
            getFollowingControl(item,key,out returnControl);
        }
    }
    else
    {
        if(c.Id==key)
        {
            returnControl=c;
            break;
        }

    }
}

Now you can use above recusive function to find any control at any depth....

Control getThisControl=null;
getFllowingControl(this,"myButton1",out getThisControl);

At the end it would give you the control that has Id="myButton1" in GetThisControl control object.

Upvotes: 0

Viktor S.
Viktor S.

Reputation: 12815

You can't do it like you want as it is not a control. You should place runat="server" attribute on it, or you can get it somehow from showdiv.InnerHtml - there it should be presented as a string which you can parse with some HTML parser for .net (for instance, HTMLAgilityPack suggested here)

To create server side controls at run time, you can use something like below:

for (Int32 i = 0; i < 2; i++)
{
        HtmlGenericControl div = new HtmlGenericControl("div");
        div.ID = i.ToString();
        div.InnerHtml = i.ToString();
        div.ClientIDMode = ClientIDMode.Static; //this is for .NET 4.5 only. Required to have ClientID the same as ID.
        showdiv.Controls.Add(div);
}

and than, after controls are added, you should be able to use something like this:

HtmlGenericControl div=((HtmlGenericControl)showdiv.FindControl("1"))

to get those controls. But please remember that controls added like that, must be added for each request.

Upvotes: 3

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