How to access id of dynamic control in javascript

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Hello,
I am creating no of buttons dynamically in C#.I want to perfrom mouseover on dynamic button.my function is executing but I am not getting button id that I can perfrom some styles on that button,i am getting button id null.What should I do.

What I have tried:

C#

bt = new Button();
                       bt.ID = "button" + i;                       bt.Height=17;
                       bt.ClientIDMode = ClientIDMode.Inherit;
                      
                       bt.Attributes.Add("style", "display:block");
                       bt.Attributes.Add("OnMouseOver", "javascript:display('" + bt.ClientID + "')");
                       bt.Click += new EventHandler(Buttonclick);
                       e.Row.Cells[i].Controls.Add(bt);

JavaScript code:

function display(button) {
alert("hello funtion execting" + button);
var el = document.getElementById(button);
alert(el);
el.style.display = "none";

}

Posted 8-Dec-16 21:28pm

Pragya Nagwanshi

Updated 8-Dec-16 22:24pm

v2

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F-ES Sitecore · Accepted Answer · 2016-12-08T22:23:00

You have to remember that javascript runs off of what is sent to the browser, so look at the source of the page and you'll see something like

<input type="submit" ID="GridView1_button1_0" OnMouseOver="javascript:display('button1')" />

So the id in your onmouseover doesn't match the id of the button you have created. The reason for this is because when you add a button to a container like a gridview it alters the ID to ensure the id is going to be unique on the page as you might have another gridview on the page also creating "button1".

The solution is to add the button first so that it gets it's unique ID and then use that ID in your js

C#

bt = new Button();
bt.ID = "button" + i; // add the button right away
MyPanel.Controls.Add(bt);
bt.Height = 17;
// the rest of your code here and now bt.ClientID will return the correct value

Dusara Maulik · Accepted Answer · 2016-12-08T22:24:00

Hi Pragya,

Review below code, this will help you a lot

C# Server side code:

C#

protected void Page_Load(object sender, EventArgs e)
        {

            List<string> strCol = new List<string>();


            for (int i = 0; i < 10; i++)
            {
                strCol.Add("DataRow" + i.ToString());
            }

            GridView1.DataSource = strCol;
            GridView1.DataBind();
            
        }

        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            Button bt = new Button();
            bt.ID = "button" + e.Row.RowIndex; bt.Height = 17;
            bt.ClientIDMode = ClientIDMode.Inherit;

            bt.Attributes.Add("style", "display:block");
            bt.Attributes.Add("OnMouseOver", "javascript:display(this);return false;");
            e.Row.Cells[0].Controls.Add(bt);
        }

Client side code:

ASP.NET

<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound">
                    <Columns>
                        <asp:TemplateField ></asp:TemplateField>
                    </Columns>
                </asp:GridView>

HTML

<script>

       function display(btnClicked)
       {
           alert($(btnClicked).attr('id'));
           $(btnClicked).hide();
       }

   </script>

Best of luck!! :)

How to access id of dynamic control in javascript

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