Asp control Grid view Drag And Drop And Save the Position:
Add Js File in your Application:
1.tabledndDemo.js
if(document.getElementById('txtGridNames')!=null) {
debugger;
var GridNames = document.getElementById('txtGridNames').value;
var GridObj = GridNames.split('|');
for (var i=0; i < GridObj.length; i++)
{
var GObj = document.getElementById(GridObj[i])
var tableDrop = new TableDnD();
tableDrop.findDropTargetRow = function(y) {
var rows = this.table.tBodies[0].rows;
var debugStr = "y is "+y+"<br>";
for (var i=1; i<rows.length; i++) {
var row = rows[i];
var rowY = this.getPosition(row).y;
var rowHeight = parseInt(row.offsetHeight)/2;
if (row.offsetHeight == 0) {
rowY = this.getPosition(row.firstChild).y;
rowHeight = parseInt(row.firstChild.offsetHeight)/2;
}
debugStr += "row["+i+"] between "+(rowY-rowHeight)+' and '+(rowY+rowHeight)+"<br>";
// Because we always have to insert before, we need to offset the height a bit
if ((y > rowY - rowHeight) && (y < (rowY + rowHeight))) {
// that's the row we're over
//document.getElementById('debug').innerHTML = debugStr+"found row";
return row;
}
}
//document.getElementById('debug').innerHTML = debugStr+"no matching row";
return null;
}
// Redefine the onDrop so that we can display something
tableDrop.onDrop = function(table, row)
{
var rows = this.table.tBodies[0].rows;
var debugStr = "rows now: ";
for (var i=1; i<rows.length; i++) {
debugStr += rows[i].id+" ";
}
//document.getElementById('debug').innerHTML = 'row['+row.id+'] dropped<br>'+debugStr;
//Rearranging the SNO in Grid
var rows_no = this.table.tBodies[0].rows;
for (var j=1; j<rows_no.length; j++)
{
var rowtr = rows_no[j];
if (rowtr.cells[1])
{
rowtr.cells[1].innerHTML=j;
if (table.id == "MainContent_gv_subordiantes")
{
if(j%2==0)
rowtr.style.backgroundColor = "#c7e6fc";
else
rowtr.style.backgroundColor = "#FFFFFF";
}
else
{
if(j%2==0)
rowtr.style.backgroundColor="#FFFFFF";
else
rowtr.style.backgroundColor = "#c7e6fc";
}
}
}
}
tableDrop.init(GObj);
}
}
2.tablednd.js
// ===================================================================
// Author: Denis Howlett <feedback@isocra.com>
// WWW: http://www.isocra.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however we
// would appreciate it if at least the web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download.
// If you wish to share this code with others, please just point them
// to the URL instead.
//
// Please DO NOT link directly to this .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================
/** Keep hold of the current table being dragged */
var currenttable = null;
/** Capture the onmousemove so that we can see if a row from the current
* table if any is being dragged.
* @param ev the event (for Firefox and Safari, otherwise we use window.event for IE)
*/
document.onmousemove = function (ev) {
if (currenttable && currenttable.dragObject) {
ev = ev || window.event;
var mousePos = currenttable.mouseCoords(ev);
var y = mousePos.y - currenttable.mouseOffset.y;
if (y != currenttable.oldY) {
// work out if we're going up or down...
var movingDown = y > currenttable.oldY;
// update the old value
currenttable.oldY = y;
// update the style to show we're dragging
//currenttable.dragObject.style.backgroundColor = 'transparent';
// If we're over a row then move the dragged row to there so that the user sees the
// effect dynamically
var currentRow = currenttable.findDropTargetRow(y);
if (currentRow) {
if (movingDown && currenttable.dragObject != currentRow) {
currenttable.dragObject.parentNode.insertBefore(currenttable.dragObject, currentRow.nextSibling);
} else if (!movingDown && currenttable.dragObject != currentRow) {
currenttable.dragObject.parentNode.insertBefore(currenttable.dragObject, currentRow);
}
}
}
return false;
}
}
// Similarly for the mouseup
document.onmouseup = function(ev){
if (currenttable && currenttable.dragObject) {
var droppedRow = currenttable.dragObject;
// If we have a dragObject, then we need to release it,
// The row will already have been moved to the right place so we just reset stuff
//droppedRow.style.backgroundColor = 'transparent';
currenttable.dragObject = null;
// And then call the onDrop method in case anyone wants to do any post processing
currenttable.onDrop(currenttable.table, droppedRow);
currenttable = null; // let go of the table too
}
}
/** get the source element from an event in a way that works for IE and Firefox and Safari
* @param evt the source event for Firefox (but not IE--IE uses window.event) */
function getEventSource(evt) {
if (window.event) {
evt = window.event; // For IE
return evt.srcElement;
} else {
return evt.target; // For Firefox
}
}
/**
* Encapsulate table Drag and Drop in a class. We'll have this as a Singleton
* so we don't get scoping problems.
*/
function TableDnD() {
/** Keep hold of the current drag object if any */
this.dragObject = null;
/** The current mouse offset */
this.mouseOffset = null;
/** The current table */
this.table = null;
/** Remember the old value of Y so that we don't do too much processing */
this.oldY = 0;
/** Initialise the drag and drop by capturing mouse move events */
this.init = function(table)
{
this.table = table;
if(table)
{
var rows = table.tBodies[0].rows; //getElementsByTagName("tr")
for (var i=1; i<rows.length; i++)
{
//Pager row chkd here & background image not applied
if(rows[i].cells.length!="1"){
//To set Drag image for the dragging the rows
rows[i].cells[0].style.backgroundImage='url(../images/ReOrder.png)';
rows[i].cells[0].style.backgroundRepeat="no-repeat";
rows[i].cells[0].style.backgroundPosition="center";
//End
}
// John Tarr: added to ignore rows that I've added the NoDnD attribute to (Category and Header rows)
var nodrag = rows[i].getAttribute("NoDrag")
if (nodrag == null || nodrag == "undefined")
{ //There is no NoDnD attribute on rows I want to drag
this.makeDraggable(rows[i]);
}
}
}
}
/** This function is called when you drop a row, so redefine it in your code
to do whatever you want, for example use Ajax to update the server */
this.onDrop = function(table, droppedRow) {
// Do nothing for now
}
/** Get the position of an element by going up the DOM tree and adding up all the offsets */
this.getPosition = function(e){
var left = 0;
var top = 0;
/** Safari fix -- thanks to Luis Chato for this! */
if (e.offsetHeight == 0) {
/** Safari 2 doesn't correctly grab the offsetTop of a table row
this is detailed here:
http://jacob.peargrove.com/blog/2006/technical/table-row-offsettop-bug-in-safari/
the solution is likewise noted there, grab the offset of a table cell in the row - the firstChild.
note that firefox will return a text node as a first child, so designing a more thorough
solution may need to take that into account, for now this seems to work in firefox, safari, ie */
e = e.firstChild; // a table cell
}
while (e.offsetParent){
left += e.offsetLeft;
top += e.offsetTop;
e = e.offsetParent;
}
left += e.offsetLeft;
top += e.offsetTop;
return {x:left, y:top};
}
/** Get the mouse coordinates from the event (allowing for browser differences) */
this.mouseCoords = function(ev){
if(ev.pageX || ev.pageY){
return {x:ev.pageX, y:ev.pageY};
}
return {
x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
y:ev.clientY + document.body.scrollTop - document.body.clientTop
};
}
/** Given a target element and a mouse event, get the mouse offset from that element.
To do this we need the element's position and the mouse position */
this.getMouseOffset = function(target, ev){
ev = ev || window.event;
var docPos = this.getPosition(target);
var mousePos = this.mouseCoords(ev);
return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};
}
/** Take an item and add an onmousedown method so that we can make it draggable */
this.makeDraggable = function(item) {
if(!item) return;
var self = this; // Keep the context of the TableDnd inside the function
item.onmousedown = function(ev) {
// Need to check to see if we are an input or not, if we are an input, then
// return true to allow normal processing
var target = getEventSource(ev);
if (target.tagName == 'INPUT' || target.tagName == 'SELECT') return true;
currenttable = self;
self.dragObject = this;
self.mouseOffset = self.getMouseOffset(this, ev);
return false;
}
item.style.cursor = "pointer";
}
/** We're only worried about the y position really, because we can only move rows up and down */
this.findDropTargetRow = function(y) {
var rows = this.table.tBodies[0].rows;
for (var i=0; i<rows.length; i++) {
var row = rows[i];
// John Tarr added to ignore rows that I've added the NoDnD attribute to (Header rows)
var nodrop = row.getAttribute("NoDrop");
if (nodrop == null || nodrop == "undefined") { //There is no NoDnD attribute on rows I want to drag
var rowY = this.getPosition(row).y;
var rowHeight = parseInt(row.offsetHeight)/2;
if (row.offsetHeight == 0) {
rowY = this.getPosition(row.firstChild).y;
rowHeight = parseInt(row.firstChild.offsetHeight)/2;
}
// Because we always have to insert before, we need to offset the height a bit
if ((y > rowY - rowHeight) && (y < (rowY + rowHeight))) {
// that's the row we're over
return row;
}
}
}
return null;
}
}
Grid View control:
<input type="hidden" id="txtGridNames" value="MainContent_DG|MainContent_gv_subordiantes|" />
<script type="text/javascript" language="javascript" src="Scripts/tablednd.js"></script>
<asp:GridView ID="gv_subordiantes" SkinID="newskin_GridDoc" Width="80%" CssClass="hand" style="border:1px solid #B8CFE1;overflow:hidden;" EmptyDataText="No Records Found" runat="server" AllowSorting="True" AllowPaging="false" AutoGenerateColumns="False" >
<AlternatingRowStyle BackColor="#c7e6fc" /> <RowStyle BackColor="White" HorizontalAlign="Left" /> <HeaderStyle HorizontalAlign="Left" CssClass="GridHeaderLayoutview"/>
<Columns>
<asp:TemplateField ItemStyle-CssClass="hand" HeaderText="Drag" HeaderStyle-Width="1%"><ItemStyle /><ItemTemplate></ItemTemplate></asp:TemplateField>
<asp:BoundField DataField="Employeeid" />
<asp:BoundField DataField="Lastname" />
<asp:BoundField DataField="Firstname" />
</Columns>
</asp:GridView>
<script type="text/javascript" language="javascript" src="Scripts/tabledndDemo.js"></script>
JavaScript: Save the Rearrange Value.
function Save_sub() {
var Gv_sub = document.getElementById('gv_subordiantes');
this.table = Gv_sub; var row_no = Gv_sub.tBodies[0].rows;
var _value = ""; var id = "";
for (var j = 1; j < row_no.length; j++) {
var rowtr = row_no[j];
if (rowtr.cells[0].childNodes[0].value == "") {
id = rowtr.cells[2].childNodes[0].value;
} else {
id = rowtr.cells[0].childNodes[0].value;
}
document.getElementById('<%=hidPosition.ClientID%>').value += id + "|" + rowtr.cells[1].innerHTML + ",";
_value += id + "|" + rowtr.cells[1].innerHTML + ",";
}
__doPostBack('SubMenu', 'EmpSave');
}
server Side Coding:
if (Request.Form["__EventArgument"].ToString() == "EmpSave")
{
Save_emp();
}
private void Save_emp()
{
// int _splitval = Convert.ToInt32(Hdn_imgdelid.Value);
string StrSql1 = "";
if (hidPosition1.Value != "" && hidPosition1.Value != null)
{
string StrSql = "";
string[] _Split = hidPosition1.Value.Split(',');
for (int i = 0; i < _Split.Length - 1; i++)
{
string[] _position = _Split[i].ToString().Split('|');
StrSql += " update Performance_LegoMetrics set position='" + _position[1] + "' where LegoMetricsId='" + _position[0] + "' ";
// StrSql += " update performance_pulledmetrics set position='" + _position[1] + "' where LegoMetricsId='" + _position[0] + "' ";
}
}
}
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