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ASP.NET - Drag and Drop on a Webpage

, 28 Dec 2004
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Drag and drop contained objects on a webpage.


Many web applications are required to be complex yet intuitive to the user. One way to achieve this is to create objects or areas of the web page draggable and droppable. Unfortunately, ASP.NET server controls do not have the Drag events and DragEventArgs. Fortunately, there is a way to enable drag and drop functionalities within a web page. Now keep in mind, this is not like a Windows application where you can drag files from the user's PC to the application. The drag and drop is limited to the boundaries of the web page.

Using the code

  1. Create a web application within your solution.
  2. Create a web page.
  3. Add the provided JavaScript in the <HEAD> of your <HTML>.
  4. Add two textboxes and a button in the web form.
  5. Add the DrawContainers method to the code-behind of the web page.
  6. Ensure that the click event for the button calls the DrawContainers method.


  • Download the source code and run the sample application.


This is the JavaScript that enables the drag and drop to take place:

<!--<span class="code-comment">------- Drag and Drop JavaScript ------------></span>

C# code behind - DrawContainers method

This is the code behind used to create the drag and drop objects:

private void DrawContainers()
    TableRowCollection trCol = this.Table1.Rows;
    TableRow tr = null;
    // Should we continue?
    if(this.txtContX.Text == null || this.txtContY.Text == null)
    // Size of the row.
    int rowSize = Int32.Parse(this.txtContX.Text); 
    // Number of rows.
    int rowNumber = Int32.Parse(this.txtContY.Text);
    // Total number of containers.
    int numberOfContainers = rowSize * rowNumber;
    // Boolean value for empty table cells.
    bool isEmpty = false;
    // Loop through all of the containers.
    for(int i=0; i< numberOfContainers; i++)
        // new row mod.
        int newRow =  i % rowSize;
        // Should we create a new row?
        if(tr == null || newRow == 0)
            tr = new TableRow();

        // Empty cell generator.
            isEmpty = true;
            isEmpty = false;

        // Set the cell collection.
        TableCellCollection tdc = tr.Cells;

        // Create a new table cell.
        TableCell td = new TableCell();
        td.ID = "cell_" + i.ToString();
        // Set the cell backcolor.
        td.BackColor = Color.Turquoise;
        // Set the cell's class.
        td.CssClass = "SpecimenLoc";

        td.Attributes.Add("SpecimenId", "");

        // Is the cell empty?
            td.Attributes.Add("SpecimenId", i.ToString());
            td.BackColor = Color.Beige;
            td.Text = i.ToString();
        // Add javascript attributes to the cell.
        td.Attributes.Add("target", "true");
        td.Attributes.Add("onmousedown", "BeginDrag(;");
        td.Attributes.Add("onmouseup", "CancelDrag();"); 
        td.Width = Unit.Pixel(35);
        td.Height = Unit.Pixel(35);

        // Add the cell to the cell collection.

C# code behind - button click event

The click event of the button:

private void btnDrawContainers_Click(object sender, System.EventArgs e)
    // Draw the containers.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Kenny Young
United States United States
No Biography provided

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Comments and Discussions

AnswerRe: What is document.all(&quot;DW&quot;)? Pin
Kenny Young2-Mar-05 12:52
sussKenny Young2-Mar-05 12:52 
GeneralRe: What is document.all(&quot;DW&quot;)? Pin
Joe Don Mitchell3-Mar-05 5:10
memberJoe Don Mitchell3-Mar-05 5:10 
GeneralUsing Datagrid Pin
Ajit Ober17-Feb-05 9:13
sussAjit Ober17-Feb-05 9:13 
GeneralRe: Using Datagrid Pin
Kenny Young17-Feb-05 9:32
sussKenny Young17-Feb-05 9:32 
GeneralRe: Using Datagrid Pin
Ajit Ober17-Feb-05 10:38
sussAjit Ober17-Feb-05 10:38 
GeneralRe: Using Datagrid Pin
Kenny Young18-Feb-05 10:17
sussKenny Young18-Feb-05 10:17 
GeneralRe: Using Datagrid Pin
Anonymous28-Feb-05 5:07
sussAnonymous28-Feb-05 5:07 
GeneralRe: Using Datagrid Pin
Anonymous28-Feb-05 6:36
sussAnonymous28-Feb-05 6:36 
Try addind a LiterlControl "DIV" into the cell of the grid. Add the attributes to the LiteralControl and not the cell of the grid.
GeneralRe: Using Datagrid Pin
Ajit Ober28-Feb-05 9:44
sussAjit Ober28-Feb-05 9:44 
GeneralRe: Using Datagrid Pin
Ajit Ober28-Feb-05 9:46
sussAjit Ober28-Feb-05 9:46 
QuestionFirefox? Pin
Ivo Silvestri15-Feb-05 0:51
memberIvo Silvestri15-Feb-05 0:51 
AnswerRe: Firefox? Pin
Kenny Young15-Feb-05 3:28
sussKenny Young15-Feb-05 3:28 
GeneralRe: Firefox? Pin
williaml22-Feb-05 13:34
susswilliaml22-Feb-05 13:34 
GeneralImage in TD Pin
arobadol6-Jan-05 2:28
memberarobadol6-Jan-05 2:28 
GeneralRe: Image in TD Pin
Kenny Young7-Jan-05 9:20
sussKenny Young7-Jan-05 9:20 
QuestionOnDrop Event? Pin
FrEaK_CH28-Dec-04 11:09
memberFrEaK_CH28-Dec-04 11:09 
AnswerRe: OnDrop Event? Pin
Kenny Young28-Dec-04 11:25
sussKenny Young28-Dec-04 11:25 
GeneralRe: OnDrop Event? Pin
FrEaK_CH28-Dec-04 12:58
memberFrEaK_CH28-Dec-04 12:58 
GeneralRe: OnDrop Event? Pin
Kenny Young29-Dec-04 3:47
sussKenny Young29-Dec-04 3:47 

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