This Article shows you how to create ajax based gridview

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Introduction

This is an Ajax gridview where information appears in popup. User(s) need not click [more] button in gridview to retrieve additional information from other page(s). This is all done in mouse-over-event whenever user(s) position his mouse on gridview row-specific additional information springs up in popup. i choose to remain silent on the core features of Ajax but, of course, relevant functionalities would definitely be dealt with.

Background

To learn basics of Ajax .

Using the code

A brief description on manner of usage of article or code- class names, methods , properties,...... any tricks or tips.

I am using three files here: data.aspx-cs, infonew.aspx-cs, dhtmlwindow.js to interact with Ajax functionality in gridview.

Blocks of code should be set as style "Formatted" like this:

As you know , i am using gridview wherein the main event is to hit mouse-over.

file-1(data.aspx.cs)

//
// 
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{
if (e.Row.RowType == DataControlRowType.DataRow)

{

int index = Convert.ToInt32(e.Row.RowIndex.ToString());

index+=1;

int offset = 130 + (index * 5);

e.Row.Attributes["onmouseover"] = "ajaxwin=dhtmlwindow.open('ajaxbox', 'ajax', 'infonew.aspx?id=', '', 'width=420px,height=90px,left=160px,top="+offset+"px,resize=0,scrolling=0','',this); return false";

e.Row.Attributes["onmouseout"] = "ajaxwin.hide(this)";
}

}

string val;

protected void Page_Load(object sender, EventArgs e)

{
BindDataGrid();
}

public void BindDataGrid()

{

DBLibrary obj = new DBLibrary();

obj.path1 = Server.MapPath("Database/bangaloreFriends.mdb");

GridView1.DataSource = obj.DataTable("SELECT id,CName,PhoneNo,Location FROM combind order by id", "combind");

GridView1.DataBind();

}
protected void GridView1_PageIndexChanging1(object sender, GridViewPageEventArgs e)

{
GridView1.PageIndex = e.NewPageIndex;
BindDataGrid();
}

//Ajax Code

var dhtmlwindow={

imagefiles:['windowfiles/min.gif', 'windowfiles/close.gif', 'windowfiles/restore.gif', 'windowfiles/resize.gif'], //Path to 4 images used by script, in that order

ajaxbustcache: true, //Bust caching when fetching a file via Ajax?

minimizeorder: 0,

tobjects: [], //object to contain references to dhtml window divs, for cleanup purposes

oldgridSelectedColor: "color",

init:function(t){



var domwindow=document.createElement("div") //create dhtml window div

domwindow.id=t

domwindow.className="dhtmlwindow"

var domwindowdata=''

domwindowdata='<div class="drag-handle">'

//domwindowdata+='DHTML Window <div class="drag-controls"><img src="'+this.imagefiles[0]+'" title="Minimize" /><img src="'+this.imagefiles[1]+'" title="Close" /></div>'

domwindowdata+='DHTML Window <div class="drag-controls"></div>'

domwindowdata+='</div>'

domwindowdata+='<div class="drag-contentarea"></div>'

domwindowdata+='<div class="drag-statusarea"><div class="drag-resizearea" style="background: transparent url('+this.imagefiles[3]+') top right no-repeat;"> </div></div>'

domwindowdata+='</div>'

domwindow.innerHTML=domwindowdata

document.getElementById("dhtmlwindowholder").appendChild(domwindow)

this.zIndexvalue=(this.zIndexvalue)? this.zIndexvalue+1 : 100 //z-index value for DHTML window: starts at 0, increments whenever a window has focus

var t=document.getElementById(t)

var divs=t.getElementsByTagName("div")

for (var i=0; i<divs.length; i++){ //go through divs inside dhtml window and extract all those with class="drag-" prefix

if (/drag-/.test(divs[i].className))

t[divs[i].className.replace(/drag-/, "")]=divs[i] //take out the "drag-" prefix for shorter access by name

}

t.style.zIndex=this.zIndexvalue //set z-index of this dhtml window

t.handle._parent=t //store back reference to dhtml window

t.resizearea._parent=t //same

t.controls._parent=t //same

t.onclose=function(){return true} //custom event handler "onclose"

t.onmousedown=function(){dhtmlwindow.zIndexvalue++; this.style.zIndex=dhtmlwindow.zIndexvalue} //Increase z-index of window when focus is on it

t.handle.onmousedown=dhtmlwindow.setupdrag //set up drag behavior when mouse down on handle div

t.resizearea.onmousedown=dhtmlwindow.setupdrag //set up drag behavior when mouse down on resize div

t.controls.onclick=dhtmlwindow.enablecontrols

t.show=function(){dhtmlwindow.show(this)} //public function for showing dhtml window

t.hide=function(element){dhtmlwindow.close(this,element)} //public function for hiding dhtml window

t.setSize=function(w, h){dhtmlwindow.setSize(this, w, h)} //public function for setting window dimensions

t.moveTo=function(x, y){dhtmlwindow.moveTo(this, x, y)} //public function for moving dhtml window (relative to viewpoint)

t.isResize=function(bol){dhtmlwindow.isResize(this, bol)} //public function for specifying if window is resizable

t.isScrolling=function(bol){dhtmlwindow.isScrolling(this, bol)} //public function for specifying if window content contains scrollbars

t.load=function(contenttype, contentsource, title){dhtmlwindow.load(this, contenttype, contentsource, title)} //public function for loading content into window

this.tobjects[this.tobjects.length]=t

return t //return reference to dhtml window div

},

open:function(t, contenttype, contentsource, title, attr, recalonload,element){

var d=dhtmlwindow //reference dhtml window object

function getValue(Name){

var config=new RegExp(Name+"=([^,]+)", "i") //get name/value config pair (ie: width=400px,)

return (config.test(attr))? parseInt(RegExp.$1) : 0 //return value portion (int), or 0 (false) if none found

}



oldgridSelectedColor=element.style.backgroundColor



if (document.getElementById(t)==null) //if window doesn't exist yet, create it

t=this.init(t,element) //return reference to dhtml window div

else

t=document.getElementById(t)

t.setSize(getValue(("width")), (getValue("height"))) //Set dimensions of window

var xpos=getValue("center")? "middle" : getValue("left") //Get x coord of window

var ypos=getValue("center")? "middle" : getValue("top") //Get y coord of window

//t.moveTo(xpos, ypos) //Position window

if (typeof recalonload!="undefined" && recalonload=="recal" && this.scroll_top==0){ //reposition window when page fully loads with updated window viewpoints?

if (window.attachEvent && !window.opera) //In IE, add another 400 milisecs on page load (viewpoint properties may return 0 b4 then)

this.addEvent(window, function(){setTimeout(function(){t.moveTo(xpos, ypos)}, 400)}, "load")

else

this.addEvent(window, function(){t.moveTo(xpos, ypos)}, "load")

}

t.isResize(getValue("resize")) //Set whether window is resizable

t.isScrolling(getValue("scrolling")) //Set whether window should contain scrollbars

t.style.visibility="visible"

t.style.display="block"

t.contentarea.style.display="block"

t.moveTo(xpos, ypos) //Position window

kop=element.cells[0].innerText



element.style.backgroundColor="yellow"

contentsource=contentsource+kop

t.load(contenttype, contentsource, title)

if (t.state=="minimized" && t.controls.firstChild.title=="Restore"){ //If window exists and is currently minimized?

t.controls.firstChild.setAttribute("src", dhtmlwindow.imagefiles[0]) //Change "restore" icon within window interface to "minimize" icon

t.controls.firstChild.setAttribute("title", "Minimize")

t.state="fullview" //indicate the state of the window as being "fullview"

}

return t

},

setSize:function(t, w, h){ //set window size (min is 150px wide by 90px tall)

t.style.width=Math.max(parseInt(w), 150)+"px"

t.contentarea.style.height=Math.max(parseInt(h), 90)+"px"

},

moveTo:function(t, x, y){ //move window. Position includes current viewpoint of document

this.getviewpoint() //Get current viewpoint numbers

t.style.left=(x=="middle")? this.scroll_left+(this.docwidth-t.offsetWidth)/2+"px" : this.scroll_left+parseInt(x)+"px"

//t.style.top=(y=="middle")? this.scroll_top+(this.docheight-t.offsetHeight)/2+"px" : this.scroll_top+parseInt(y)+"px"

t.style.top=(y=="middle")? (this.docheight-t.offsetHeight)/2+"px" : parseInt(y)+"px"

},

isResize:function(t, bol){ //show or hide resize inteface (part of the status bar)

t.statusarea.style.display=(bol)? "block" : "none"

t.resizeBool=(bol)? 1 : 0

},

isScrolling:function(t, bol){ //set whether loaded content contains scrollbars

t.contentarea.style.overflow=(bol)? "auto" : "hidden"

},

load:function(t, contenttype, contentsource, title){ //loads content into window plus set its title (3 content types: "inline", "iframe", or "ajax")

var contenttype=contenttype.toLowerCase() //convert string to lower case

if (typeof title!="undefined")

t.handle.firstChild.nodeValue=title

if (contenttype=="inline")

t.contentarea.innerHTML=contentsource

else if (contenttype=="div"){

t.contentarea.innerHTML=document.getElementById(contentsource).innerHTML //Populate window with contents of specified div on page

document.getElementById(contentsource).style.display="none" //hide that div

}

else if (contenttype=="iframe"){

t.contentarea.style.overflow="hidden" //disable window scrollbars, as iframe already contains scrollbars

if (!t.contentarea.firstChild || t.contentarea.firstChild.tagName!="IFRAME") //If iframe tag doesn't exist already, create it first

t.contentarea.innerHTML='<iframe src="" style="margin:0; padding:0; width:100%; height: 100%" name="_iframe-'+t.id+'"></iframe>'

window.frames["_iframe-"+t.id].location.replace(contentsource) //set location of iframe window to specified URL

}

else if (contenttype=="ajax"){

this.ajax_connect(contentsource, t) //populate window with external contents fetched via Ajax

}

t.contentarea.datatype=contenttype //store contenttype of current window for future reference

},

setupdrag:function(e){

var d=dhtmlwindow //reference dhtml window object

var t=this._parent //reference dhtml window div

d.etarget=this //remember div mouse is currently held down on ("handle" or "resize" div)

var e=window.event || e

d.initmousex=e.clientX //store x position of mouse onmousedown

d.initmousey=e.clientY

d.initx=parseInt(t.offsetLeft) //store offset x of window div onmousedown

d.inity=parseInt(t.offsetTop)

d.width=parseInt(t.offsetWidth) //store width of window div

d.contentheight=parseInt(t.contentarea.offsetHeight) //store height of window div's content div

if (t.contentarea.datatype=="iframe"){ //if content of this window div is "iframe"

t.style.backgroundColor="#F8F8F8" //colorize and hide content div (while window is being dragged)

t.contentarea.style.visibility="hidden"

}

document.onmousemove=d.getdistance //get distance travelled by mouse as it moves

document.onmouseup=function(){

if (t.contentarea.datatype=="iframe"){ //restore color and visibility of content div onmouseup

t.contentarea.style.backgroundColor="white"

t.contentarea.style.visibility="visible"

}

d.stop()

}

return false

},

getdistance:function(e){

var d=dhtmlwindow

var etarget=d.etarget

var e=window.event || e

d.distancex=e.clientX-d.initmousex //horizontal distance travelled relative to starting point

d.distancey=e.clientY-d.initmousey

if (etarget.className=="drag-handle") //if target element is "handle" div

d.move(etarget._parent, e)

else if (etarget.className=="drag-resizearea") //if target element is "resize" div

d.resize(etarget._parent, e)

return false //cancel default dragging behavior

},

getviewpoint:function(){ //get window viewpoint numbers

var ie=document.all && !window.opera

var domclientWidth=document.documentElement && parseInt(document.documentElement.clientWidth) || 100000 //Preliminary doc width in non IE browsers

this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body //create reference to common "body" across doctypes

this.scroll_top=(ie)? this.standardbody.scrollTop : window.pageYOffset

this.scroll_left=(ie)? this.standardbody.scrollLeft : window.pageXOffset

this.docwidth=(ie)? this.standardbody.clientWidth : (/Safari/i.test(navigator.userAgent))? window.innerWidth : Math.min(domclientWidth, window.innerWidth-16)

this.docheight=(ie)? this.standardbody.clientHeight: window.innerHeight

},

rememberattrs:function(t){ //remember certain attributes of the window when it's minimized or closed, such as dimensions, position on page

this.getviewpoint() //Get current window viewpoint numbers

t.lastx=parseInt((t.style.left || t.offsetLeft))-dhtmlwindow.scroll_left //store last known x coord of window just before minimizing

t.lasty=parseInt((t.style.top || t.offsetTop))-dhtmlwindow.scroll_top

t.lastwidth=parseInt(t.style.width) //store last known width of window just before minimizing/ closing

},

move:function(t, e){

t.style.left=dhtmlwindow.distancex+dhtmlwindow.initx+"px"

t.style.top=dhtmlwindow.distancey+dhtmlwindow.inity+"px"

},

resize:function(t, e){

t.style.width=Math.max(dhtmlwindow.width+dhtmlwindow.distancex, 150)+"px"

t.contentarea.style.height=Math.max(dhtmlwindow.contentheight+dhtmlwindow.distancey, 100)+"px"

},

enablecontrols:function(e){

var d=dhtmlwindow

var sourceobj=window.event? window.event.srcElement : e.target //Get element within "handle" div mouse is currently on (the controls)

if (/Minimize/i.test(sourceobj.getAttribute("title"))) //if this is the "minimize" control

d.minimize(sourceobj, this._parent)

else if (/Restore/i.test(sourceobj.getAttribute("title"))) //if this is the "restore" control

d.restore(sourceobj, this._parent)

else if (/Close/i.test(sourceobj.getAttribute("title"))) //if this is the "close" control

d.close(this._parent)

return false

},

minimize:function(button, t){

dhtmlwindow.rememberattrs(t)

button.setAttribute("src", dhtmlwindow.imagefiles[2])

button.setAttribute("title", "Restore")

t.state="minimized" //indicate the state of the window as being "minimized"

t.contentarea.style.display="none"

t.statusarea.style.display="none"

if (typeof t.minimizeorder=="undefined"){ //stack order of minmized window on screen relative to any other minimized windows

dhtmlwindow.minimizeorder++ //increment order

t.minimizeorder=dhtmlwindow.minimizeorder

}

t.style.left="10px" //left coord of minmized window

t.style.width="200px"

var windowspacing=t.minimizeorder*10 //spacing (gap) between each minmized window(s)

t.style.top=dhtmlwindow.scroll_top+dhtmlwindow.docheight-(t.handle.offsetHeight*t.minimizeorder)-windowspacing+"px"

},

restore:function(button, t){

dhtmlwindow.getviewpoint()

button.setAttribute("src", dhtmlwindow.imagefiles[0])

button.setAttribute("title", "Minimize")

t.state="fullview" //indicate the state of the window as being "fullview"

t.style.display="block"

t.contentarea.style.display="block"

if (t.resizeBool) //if this window is resizable, enable the resize icon

t.statusarea.style.display="block"

t.style.left=parseInt(t.lastx)+dhtmlwindow.scroll_left+"px" //position window to last known x coord just before minimizing

t.style.top=parseInt(t.lasty)+dhtmlwindow.scroll_top+"px"

t.style.width=parseInt(t.lastwidth)+"px"

},

 

close:function(t,element){

try{

element.style.backgroundColor=oldgridSelectedColor

var closewinbol=t.onclose()



}

catch(err){ //In non IE browsers, all errors are caught, so just run the below

var closewinbol=true

}

finally{ //In IE, not all errors are caught, so check if variable isn't defined in IE in those cases

if (typeof closewinbol=="undefined"){

alert("An error has occured somwhere inside your \"onclose\" event handler")

var closewinbol=true

}

}

if (closewinbol){ //if custom event handler function returns true

if (t.state!="minimized") //if this window isn't currently minimized

dhtmlwindow.rememberattrs(t) //remember window's dimensions/position on the page before closing

t.style.display="none"

}

return closewinbol

},

show:function(t){

if (t.lastx) //If there exists previously stored information such as last x position on window attributes (meaning it's been minimized or closed)

dhtmlwindow.restore(t.controls.firstChild, t) //restore the window using that info

else

t.style.display="block"

t.state="fullview" //indicate the state of the window as being "fullview"

},

ajax_connect:function(url, t){

var page_request = false

var bustcacheparameter=""

if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc

page_request = new XMLHttpRequest()

else if (window.ActiveXObject){ // if IE6 or below

try {

page_request = new ActiveXObject("Msxml2.XMLHTTP")

} 

catch (e){

try{

page_request = new ActiveXObject("Microsoft.XMLHTTP")

}

catch (e){}

}

}

else

return false

page_request.onreadystatechange=function(){dhtmlwindow.ajax_loadpage(page_request, t)}

if (this.ajaxbustcache) //if bust caching of external page

bustcacheparameter=(url.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()

page_request.open('GET', url+bustcacheparameter, true)

page_request.send(null)

},

ajax_loadpage:function(page_request, t){

if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){

t.contentarea.innerHTML=page_request.responseText

}

},

 

stop:function(){

dhtmlwindow.etarget=null //clean up

document.onmousemove=null

document.onmouseup=null

},

addEvent:function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)

var tasktype=(window.addEventListener)? tasktype : "on"+tasktype

if (target.addEventListener)

target.addEventListener(tasktype, functionref, false)

else if (target.attachEvent)

target.attachEvent(tasktype, functionref)

},

cleanup:function(){

for (var i=0; i<dhtmlwindow.tobjects.length; i++){

dhtmlwindow.tobjects[i].handle._parent=dhtmlwindow.tobjects[i].resizearea._parent=dhtmlwindow.tobjects[i].controls._parent=null

}

window.onload=null

}

} //End dhtmlwindow object

document.write('<div id="dhtmlwindowholder"><span style="display:none">.</span></div>') //container that holds all dhtml window divs on page

window.onunload=dhtmlwindow.cleanup

Points of Interest

c#.net,ASP.net, C++, Remoting, Ajax, silverlight, com,dcom , windows mobile.

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