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How to create pulldown menu in asp.net with c#
Posted By hema chandran on 19 Jun 2006
Help me.
I want details of how to create a pulldown menu(like this forum's [our partner menu]) in asp with c# and i also want sample code for the above.

hemachandran munuswamy
AuthorReply
Lee
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Re: How to create pulldown menu in asp.net with c#
Posted By Lee on 19 Jun 2006  

Send me your email address and I'll send you the code as a file.

or here is the code:

<SCRIPT language="JavaScript">
<!-- hiding
var isDOM = (document.getElementById ? true : false);
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);

function getRef(id)
{
 if (isDOM)
  return document.getElementById(id);
  
 if
  (isIE4) return document.all[id];
  
 if (isNS4)
  return document.layers[id];
}

function getSty(id)
{
 return (isNS4 ? getRef(id) : getRef(id).style);
}

// Hide timeout.
var popTimer = 0;
// Array showing highlighted menu items.
var litNow = new Array();

function popOver(menuNum, itemNum)
{
 clearTimeout(popTimer);
 hideAllBut(menuNum);
 litNow = getTree(menuNum, itemNum);
 changeCol(litNow, true);
 targetNum = menu[menuNum][itemNum].target;
 
 if (targetNum > 0)
 {
  thisX = parseInt(menu[menuNum][0].ref.left) + parseInt(menu[menuNum][itemNum].ref.left);
  thisY = parseInt(menu[menuNum][0].ref.top) + parseInt(menu[menuNum][itemNum].ref.top);
  
  with (menu[targetNum][0].ref)
  {
   left = parseInt(thisX + menu[targetNum][0].x);
   top = parseInt(thisY + menu[targetNum][0].y);
   visibility = 'visible';
  }
 }
}

function popOut(menuNum, itemNum)
{
 if ((menuNum == 0) && !menu[menuNum][itemNum].target)
  hideAllBut(0)
 else
  popTimer = setTimeout('hideAllBut(0)', 500);
}

function getTree(menuNum, itemNum)
{

 // Array index is the menu number. The contents are null (if that menu is not a parent)
 // or the item number in that menu that is an ancestor (to light it up).
 itemArray = new Array(menu.length);

 while(1)
 {
  itemArray[menuNum] = itemNum;
  // If we've reached the top of the hierarchy, return.
  if (menuNum == 0)
   return itemArray;
   
  itemNum = menu[menuNum][0].parentItem;
  menuNum = menu[menuNum][0].parentMenu;
   }
}

// Pass an array and a boolean to specify colour change, true = over colour.
function changeCol(changeArray, isOver)
{
 for (menuCount = 0; menuCount < changeArray.length; menuCount++)
 {
  if (changeArray[menuCount])
  {
   newCol = isOver ? menu[menuCount][0].overCol : menu[menuCount][0].backCol;
   // Change the colours of the div/layer background.
   with (menu[menuCount][changeArray[menuCount]].ref)
   {
    if (isNS4)
     bgColor = newCol;
    else
     backgroundColor = newCol;
   }
  }
 }
}

function hideAllBut(menuNum)
{
 var keepMenus = getTree(menuNum, 1);
 for (count = 0; count < menu.length; count++)
 if (!keepMenus[count])
 menu[count][0].ref.visibility = 'hidden';
 changeCol(litNow, false);
}

// *** MENU CONSTRUCTION FUNCTIONS ***

function Menu(isVert, popInd, x, y, width, overCol, backCol, borderClass, textClass)
{
 // True or false - a vertical menu?
 this.isVert = isVert;
 // The popout indicator used (if any) for this menu.
 this.popInd = popInd
 // Position and size settings.
 this.x = x;
 this.y = y;
 this.width = width;
 // Colours of menu and items.
 this.overCol = overCol;
 this.backCol = backCol;
 // The stylesheet class used for item borders and the text within items.
 this.borderClass = borderClass;
 this.textClass = textClass;
 // Parent menu and item numbers, indexed later.
 this.parentMenu = null;
 this.parentItem = null;
 // Reference to the object's style properties (set later).
 this.ref = null;
}

function Item(text, href, frame, length, spacing, target)
{
 this.text = text;
 this.href = href;
 this.frame = frame;
 this.length = length;
 this.spacing = spacing;
 this.target = target;
 // Reference to the object's style properties (set later).
 this.ref = null;
}

function writeMenus()
{
 if (!isDOM && !isIE4 && !isNS4)
  return;

 for (currMenu = 0; currMenu < menu.length; currMenu++) with (menu[currMenu][0])
 {
  // Variable for holding HTML for items and positions of next item.
  var str = '', itemX = 0, itemY = 0;

  // Remember, items start from 1 in the array (0 is menu object itself, above).
  // Also use properties of each item nested in the other with() for construction.
  for (currItem = 1; currItem < menu[currMenu].length; currItem++) with (menu[currMenu][currItem])
  {
   var itemID = 'menu' + currMenu + 'item' + currItem;

   // The width and height of the menu item - dependent on orientation!
   var w = (isVert ? width : length);
   var h = (isVert ? length : width);

   // Create a div or layer text string with appropriate styles/properties.
   // Thanks to Paul Maden (www.paulmaden.com) for helping debug this in IE4, apparently
   // the width must be a miniumum of 3 for it to work in that browser.
   if (isDOM || isIE4)
   {
    str += '<div id="' + itemID + '" style="position: absolute; left: ' + itemX + '; top: ' + itemY + '; width: ' + w + '; height: ' + h + '; visibility: inherit; ';
    if (backCol)
     str += 'background: ' + backCol + '; ';
     
    str += '" ';
   }
   
   if (isNS4)
   {
    str += '<layer id="' + itemID + '" left="' + itemX + '" top="' + itemY + '" width="' +  w + '" height="' + h + '" visibility="inherit" ';
    
    if (backCol)
     str += 'bgcolor="' + backCol + '" ';
   }
   
   if (borderClass) str += 'class="' + borderClass + '" ';

   // Add mouseover handlers and finish div/layer.
   str += 'onMouseOver="popOver(' + currMenu + ',' + currItem + ')" onMouseOut="popOut(' + currMenu + ',' + currItem + ')">';

   // Add contents of item (default: table with link inside).
   // In IE/NS6+, add padding if there's a border to emulate NS4's layer padding.
   // If a target frame is specified, also add that to the <a> tag.

   str += '<table width="' + (w - 8) + '" border="0" cellspacing="0" cellpadding="' + (!isNS4 && borderClass ? 3 : 0) + '"><tr><td align="left" height="' + (h - 7) + '">' + '<a class="' + textClass + '" href="' + href + '"' + (frame ? ' target="' + frame + '">' : '>') + text + '</a></td>';
   if (target > 0)
   {

    // Set target's parents to this menu item.
    menu[target][0].parentMenu = currMenu;
    menu[target][0].parentItem = currItem;

    // Add a popout indicator.
    if (popInd) str += '<td class="' + textClass + '" align="right">' + popInd + '</td>';
    }
     str += '</tr></table>' + (isNS4 ? '</layer>' : '</div>');
     
     if (isVert)
      itemY += length + spacing;
     else
      itemX += length + spacing;
    }
    
    if (isDOM)
    {
     var newDiv = document.createElement('div');
     document.getElementsByTagName('body').item(0).appendChild(newDiv);
     newDiv.innerHTML = str;
     ref = newDiv.style;
     ref.position = 'absolute';
     ref.visibility = 'hidden';
    }

    // Insert a div tag to the end of the BODY with menu HTML in place for IE4.
    if (isIE4)
    {
     //document.body.insertAdjacentHTML('beforeEnd', '<div id="menu' + currMenu + 'div" ' + 'style="position: absolute; visibility: hidden">' + str + '</div>');
     document.getElementById('topMenu').innerHTML = 'beforeEnd', '<div id="menu' + currMenu + 'div" ' + 'style="position: absolute; visibility: hidden">' + str + '</div>';
     ref = getSty('menu' + currMenu + 'div');
    }

    // In NS4, create a reference to a new layer and write the items to it.
    if (isNS4)
    {
     ref = new Layer(0);
     ref.document.write(str);
     ref.document.close();
    }

    for (currItem = 1; currItem < menu[currMenu].length; currItem++)
    {
     itemName = 'menu' + currMenu + 'item' + currItem;
     
     if (isDOM || isIE4)
      menu[currMenu][currItem].ref = getSty(itemName);
      
     if (isNS4)
      menu[currMenu][currItem].ref = ref.document[itemName];
    }
   }
   with(menu[0][0])
   {
    ref.left = x;
    ref.top = y;
    ref.visibility = 'visible';
   }
}

// Syntaxes: *** START EDITING HERE, READ THIS SECTION CAREFULLY! ***
//
// menu[menuNumber][0] = new Menu(Vertical menu? (true/false), 'popout indicator', left, top,
// width, 'mouseover colour', 'background colour', 'border stylesheet', 'text stylesheet');
//
// Left and Top are measured on-the-fly relative to the top-left corner of its trigger, or
// for the root menu, the top-left corner of the page.
//
// menu[menuNumber][itemNumber] = new Item('Text', 'URL', 'target frame', length of menu item,
//  additional spacing to next menu item, number of target menu to popout);
//
// If no target menu (popout) is desired, set it to 0. Likewise, if your site does not use
// frames, pass an empty string as a frame target.

// The 'length' and 'width' of an item depends on its orientation -- length is how long the item runs for

var menu = new Array();

// Default colours passed to most menu constructors
var defOver = '#1A5C9F', defBack = '#004891';

// Default 'length' of menu items - item height if menu is vertical, width if horizontal.
var defLength = 22;

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
// MAIN MENU:: Menu 0 is the special, 'root' menu from which everything else arises.
menu[0] = new Array();

// A non-vertical menu with a few different colours and no popout indicator, as an example.
// *** MOVE ROOT MENU AROUND HERE ***  it's positioned at (50, 0) and is 17px high now.
menu[0][0] = new Menu(false, '', 5, 0, 17, 'white', 'white', '', 'itemText');

// The 'length' of each of these items is 40, and there is spacing of 20 to the next item.
// Most of the links are set to '#' hashes, make sure you change them to actual files.
menu[0][1] = new Item('Die neuen Beruf', '#', '', 97, 10, 1);
menu[0][2] = new Item('Unternehmen & Beruf', '#', '', 128, 10, 2);
menu[0][3] = new Item('Unternehmen & Schule', '#', '', 138, 10, 3);
menu[0][4] = new Item('Prüfungen', '#', '', 65, 10, 4);
menu[0][5] = new Item('Best Practice', '#', '', 80, 10, 5);
menu[0][6] = new Item('FAQ', '#', '', 23, 10, 0);
menu[0][7] = new Item('Suche', '#', '', 35, 10, 0);
menu[0][8] = new Item('Download', '#', '', 70, 10, 0);
// An example of a link with a target frame/window as well...
//menu[0][4] = new Item('  Site', 'http://gusnz.cjb.net', '_new', 40, 10, 0);
//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
//SUB MENUS::////////////////////////////////////////////////////////////

// File menu.
menu[1] = new Array();
// The File menu is positioned -5px across and 16 down from its trigger, and is 80 wide.
// All text in this menu has the stylesheet class 'item' -- see the <style> section above.
// We've passed a 'greater-than' sign '>' as a popout indicator. Try an image...?
menu[1][0] = new Menu(true, '>', -5, 16, 80, defOver, defBack, 'itemBorder', 'itemText');
menu[1][1] = new Item('Open', '#', '', defLength, 0, 0);
menu[1][2] = new Item('Save', '#', '', defLength, 0, 0);
// Non-zero target means this will trigger a popout -- menu[4] which is the 'Reopen' menu.
menu[1][3] = new Item('Reopen', '#', '', defLength, 0, 4);
menu[1][4] = new Item('Exit', '#', '', defLength, 0, 0);

// Edit menu.
menu[2] = new Array();
menu[2][0] = new Menu(true, '>', -10, 16, 80, defOver, defBack, 'itemBorder', 'itemText');
menu[2][1] = new Item('Cut', '#', '', defLength, 0, 0);
menu[2][2] = new Item('Copy', '#', '', defLength, 0, 0);
menu[2][3] = new Item('Paste', '#', '', defLength, 0, 0);

// Help menu
menu[3] = new Array();
menu[3][0] = new Menu(true, '<', -10, 16, 80, defOver, defBack, 'itemBorder', 'itemText');
menu[3][1] = new Item('Contents', '#', '', defLength, 0, 0);
menu[3][2] = new Item('Index', '#', '', defLength, 0, 0);
menu[3][3] = new Item('About', '#', '', defLength, 0, 5);

// SUB-SUB MENU:: Reopen menu
menu[4] = new Array();
// This is across but not down...
menu[4][0] = new Menu(true, '>', 79, 0, 100, '#1A5C9F', '#004891', 'crazyBorder', 'crazyText');
menu[4][1] = new Item('Recent Doc 1:', '#', '', 22, 0, 0);
menu[4][2] = new Item('Recent Doc 2:', '#', '', 22, 0, 0);
menu[4][3] = new Item('Etc. etc...', '#', '', defLength, 0, 0);

// SUB-SUB MENU:: Help About popout
menu[5] = new Array();
// Leftwards popout with a negative x and y relative to its trigger.
menu[5][0] = new Menu(true, '>', -79, -22, 80, defOver, defBack, 'itemBorder', 'itemText');
menu[5][1] = new Item('and up!', '#', '', 22, 0, 0);
menu[5][2] = new Item('Leftwards!', '#', '', 20, 0, 0);

// *** OPTIONAL CODE FROM HERE DOWN ***
// These two lines handle the window resize bug in NS4. See <body onResize="...">.
// I recommend you leave this here as otherwise when you resize NS4's width menus are hidden.
var popOldWidth = window.innerWidth;
nsResizeHandler = new Function('if (popOldWidth != window.innerWidth) location.reload()');

// This is a quick snippet that captures all clicks on the document and hides the menus
// every time you click. Use if you want.
if (isNS4)
 document.captureEvents(Event.CLICK);
 
document.onclick = clickHandle;

function clickHandle(evt)
{
 if (isNS4)
  document.routeEvent(evt);
 hideAllBut(0);
}

// This is just the moving command for the example.
function moveRoot()
{
 with(menu[0][0].ref) left = ((parseInt(left) < 100) ? 100 : 5);
}
//  End -->
</SCRIPT>


Lee


Re: How to create pulldown menu in asp.net with c#
Posted By hema chandran on 19 Jun 2006  
Hai LEE,
my mail id is mail2hemachandran@gmail.com

hemachandran munuswamy

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