//
// www.calcoolate.com javaScript calculator
//
// Copyright (c) 2006. All rights reserved
//

// Auto complete edit box

// Styles used
//  .ac_normal   { background-color:#e0ecff}
//  .ac_border   { border-color:black; background-color:#e0ecff; border-collapse:collapse }
//  .ac_selected { background-color:#c3d9ff}

var AC_popupId = 'AC_popup'
var AC_current = null

var AC_currectOptions = -1
var AC_currectSelectedIndex = -1

function AutoComplete(fieldId, options)
{
	if (!document.getElementById(AC_popupId))
		document.write("<div id='"+AC_popupId+"' style='display:none;position:absolute;width:400px;height:400px;z-index:100'></div>")

	var o = new Object()
	o.fieldId = fieldId
	o.options = options

	// User controlled options
	o.openOnEmptyText = false
	o.errorIfNotMatching = false
	o.maxRows = 10
	o.onlyPrefixMatch = false
	o.markMatchedSubStrings = true
	o.highliteFirstMatch = false

	o.open = function()
	{
		AC_current = this
		AC_open(this)
	}

	o.close = function()
	{
		setTimeout("AC_close('"+this.fieldId+"')", 500) // Allow selection to complete first
	}

	o.onkeydown = function(event)
	{
		AC_onkeydown(event)
	}

	o.onkeyup = function(event)
	{
		AC_onkeyup(event, this)
	}

	o.setOptions = function(options)
	{
		o.options = options
	}

	return o
}

function AC_position(fld)
{
	var pos = new Object()
	pos.left = 0
	pos.top  = 0
	var item = fld
	while (item)
	{
		if (item.style.position == 'absolute')
			break

		pos.left += item.offsetLeft
		pos.top  += item.offsetTop
		item= item.offsetParent
	}

	return pos
}
function AC_open(autoComplete)
{
	var v = ""
	v += "<table border='1' cellspacing='0' cellpadding='0' class='ac_border' id='AC_area'><tr><td><table border='0'>"
	v += "<tr><td id='AC_options'></td></tr>"
	v += "</table>"
	v += "</td></tr></table>"

	var fld = document.getElementById(autoComplete.fieldId)
	var pos = AC_position(fld)
	var p  = document.getElementById(AC_popupId)
	p.style.left = pos.left+"px"
	p.style.top  = pos.top+fld.offsetHeight+"px"
	p.style.display = "block"

	var p  = document.getElementById(AC_popupId)
	p.innerHTML = v

	AC_populate(autoComplete)
}

function AC_show(show)
{
	if (show)
		document.getElementById(AC_popupId).style.display="block"
	else
		document.getElementById(AC_popupId).style.display="none"
}


// Populate all the matching rows
function AC_populate(autoComplete)
{
	var text = document.getElementById(autoComplete.fieldId).value
	AC_currectOptions = AC_match(autoComplete)
	AC_currectSelectedIndex = -1
	AC_show(AC_currectOptions.length > 0)
	var v = "<table border='0' cellpadding='0' cellspacing='0' class='ac_normal'>"
	for (i in AC_currectOptions)
	{
		var textObj = AC_currectOptions[i]
		var showText = textObj.displayText
		var setText = textObj.selectText
		v += "<tr><td nowrap='true' id='AC_option"+i+"' onmouseover='AC_high("+i+",true)' onmouseout='AC_high("+i+",false)' onclick='AC_set(&quot;"+setText+"&quot;)'>"+showText+"</td></tr>"
	}
	v += "</table>"

	var p  = document.getElementById(AC_popupId)
	p.style.width = "1000px" // Allow table to grow to needed size without wrapping
	p.style.height = "1000px"
	document.getElementById("AC_options").innerHTML = v
	var area  = document.getElementById('AC_area')
	p.style.width=area.style.width // Reset to minimal required size (so that it does not hide clicks on lower layers)
	p.style.height=area.style.height

	if (AC_currectOptions.length > 0 && autoComplete.highliteFirstMatch)
		AC_high(0, true)
}

// Find all matching entries
function AC_match(autoComplete)
{
	var matches = new Array()
	var text = document.getElementById(autoComplete.fieldId).value
	if (text == '' && !autoComplete.openOnEmptyText)
		return matches
	textLower = text.toLowerCase()

    for (iv in autoComplete.options)
    {
    	var option = autoComplete.options[iv]
    	var optionLower = option.toLowerCase()
    	var isMatch = false
    	if (autoComplete.onlyPrefixMatch)
    	{
    		if (text.length <= option.length && optionLower.substring(0,textLower.length) == textLower)
    			isMatch = true
    	}
    	else
    	{
    		if (optionLower.indexOf(textLower) >= 0)
    			isMatch = true
    	}
    	if (isMatch)
    	{
    		var textObj = new Object()
    		textObj.selectText = option
    		if (autoComplete.markMatchedSubStrings && text.length > 0)
    		{
    			// Mark the matching substrings
    			var rem = option
    			var remLower = optionLower
    			var displayText = ''
   				var i = remLower.indexOf(textLower)
    			while (i >= 0)
    			{
    				if (i > 0)
    					displayText += rem.substring(0, i)
    				displayText += "<b>"
    				displayText += rem.substring(i, i+text.length)
    				displayText += "</b>"
    				rem = rem.substring(i+text.length)
    				remLower = remLower.substring(i+text.length)
    				i = remLower.indexOf(textLower)
    			}
    			displayText += rem
				textObj.displayText = displayText
    		}
    		else textObj.displayText = option
    		matches[matches.length] = textObj
    		if (matches.length >= autoComplete.maxRows && autoComplete.maxRows > 0)
    			break
    	}
    }
	return matches
}

function AC_set(text)
{
	document.getElementById(AC_current.fieldId).value = text
	document.getElementById(AC_current.fieldId).focus()
	document.getElementById(AC_current.fieldId).onchange() // Note: FF Does this automatically
	AC_close(AC_current.fieldId)
}
function AC_close(fieldId)
{
	if (AC_current != null && AC_current.fieldId == fieldId)
	{
		AC_show(false)
		AC_current = null
	}
}
function AC_high(row, on)
{
	if (AC_currectSelectedIndex != -1)
		document.getElementById('AC_option'+AC_currectSelectedIndex).className = ''
	if (on)
	{
		document.getElementById('AC_option'+row).className = 'ac_selected'
		AC_currectSelectedIndex = row
	}
	else
	{
		AC_currectSelectedIndex = -1
	}
}
// Handle scroll on hints by keys
function AC_onkeydown(event)
{
	if (AC_current == null) // No open box, ignore
		return

	var k = event.keyCode
	if (k == 13) // Enter
	{
		if (AC_currectSelectedIndex >= 0)
		{
			AC_set(AC_currectOptions[AC_currectSelectedIndex].selectText)
			event.returnValue = false  // Stop processing this event
		}
	}
	if (k == 38) // Up
	{
		var newIndex = -1
		if (AC_currectSelectedIndex > 0)
			newIndex = AC_currectSelectedIndex-1
		else
		if (AC_currectSelectedIndex < 0)
			newIndex = AC_currectOptions.length-1
		if (newIndex >= 0)
			AC_high(newIndex, true)
	}
	if (k == 40) // Down
	{
		var newIndex = -1
		if (AC_currectSelectedIndex < AC_currectOptions.length-1)
			newIndex = AC_currectSelectedIndex+1
		if (newIndex >= 0)
			AC_high(newIndex, true)
	}
	if (k == 27) // Esc
	{
		AC_close(AC_current.fieldId)
	}
}
// Handle key of characters in field
function AC_onkeyup(event, autoComplete)
{
	if (AC_current == null) // No open box, ignore
		return

	var k = event.keyCode
	if (k != 13 && k != 38 && k != 40 && k != 27)
		AC_populate(autoComplete)
	else
		event.returnValue = false  // Stop processing this event
}