function SearchSuggestControl(oTextbox, oProvider) {
    this.textbox	= oTextbox;
    this.provider	= oProvider;
    this.init();
}

SearchSuggestControl.prototype.init = function () {
    if ( !this.textbox || !this.provider )
    	return;

    var oThis = this;
    this.textbox.onkeyup = function (oEvent) {
        if (!oEvent) {
            oEvent = window.event;
        }
        oThis.handleKeyUp(oEvent);
    };
};

SearchSuggestControl.prototype.handleKeyUp = function (oEvent) {
    var iKeyCode = oEvent.keyCode;

     if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode <= 46)
	|| (iKeyCode >= 112 && iKeyCode <= 123)) {
        //ignore
    } else {
        this.provider.requestSuggestions(this);
    }
};

function SearchProvider() {
    this.requestSuggestions = function( sender ) {
    	var query = sender.textbox.value;
    	var source = sender.textbox.id;
    	
    	this.JSON_request( query, source );
    },
    
    this.JSON_obj = null,
    
    this.JSON_request = function( query, source ) {
	// Make server code call
	var serverPipe = 'http://registry.lcnd.ca/json/searchSuggest.asp?'
	    + 'qu=' + escape( query )
	    + '&source=' + escape( source );

	var headID = document.getElementsByTagName("head")[0];
	
	if ( headID )
	{
	    if ( this.JSON_obj != null )
	    {
	    	headID.removeChild( this.JSON_obj );
	    }
	    this.JSON_obj = document.createElement('script');
	    this.JSON_obj.type = 'text/javascript';
	    this.JSON_obj.src = serverPipe;
	    headID.appendChild(this.JSON_obj);
	}
    }
}

/*
 * JSON code handlers
 */
var waitingSearchProvider = null;

function getY( oElement )
{
    var iReturnValue = 0;
    if ( oElement ) iReturnValue = oElement.offsetHeight;
    while( oElement != null ) {
	iReturnValue += oElement.offsetTop;
	oElement = oElement.offsetParent;
    }
    return iReturnValue;
}

function getX( oElement )
{
    var iReturnValue = 0;

    while( oElement != null ) {
	iReturnValue += oElement.offsetLeft;
	oElement = oElement.offsetParent;
    }
    return iReturnValue;
}

function hideSearchSuggest( ) {
    var suggestDiv = document.getElementById('suggestdiv');
    if ( suggestDiv )
    {
    	suggestDiv.parentNode.removeChild( suggestDiv, true );
    }
}

function processSearchSuggest( sender, value ) {
    var textbox = document.getElementById( sender );
    if ( !textbox || value.searchterms.length == 0 )
    {
    	return;
    }
    
    var suggestDiv = document.getElementById('suggestdiv');
    if ( suggestDiv )
    {
    	suggestDiv.parentNode.removeChild( suggestDiv, true );
    }
    
    suggestDiv = document.createElement( 'div' );
    suggestDiv.id = 'suggestdiv';
    
    suggestDiv.style.position = 'absolute';
    suggestDiv.style.left = getX( textbox ) + 'px';
    suggestDiv.style.top = getY( textbox ) + 'px';
    
    var suggestTable = document.createElement( 'table' );
    var suggestBody = document.createElement( 'tbody' );
    suggestDiv.appendChild( suggestTable );
    suggestTable.appendChild( suggestBody );
    var suggestRow = document.createElement( 'tr' );
    var suggestHeader = document.createElement( 'td' );
    suggestHeader.appendChild(
    	document.createTextNode( 'Search suggestions:' ) );
    suggestRow.appendChild( suggestHeader );
    suggestHeader = document.createElement( 'td' );
    suggestHeader.style.textAlign = 'right';
    suggestHeader.style.fontSize = '60%';
    suggestHeader.appendChild(
    	document.createTextNode( 'Hide' ) );
    suggestHeader.onclick = hideSearchSuggest;
    suggestRow.appendChild( suggestHeader );
    suggestBody.appendChild( suggestRow );
    suggestRow = null;
    
    for ( var x = 0; x < value.searchterms.length; x++ )
    {
    	var term = value.searchterms[x];
    	
    	var searchLink = document.createElement( 'a' );
    	searchLink.title = term;
    	
    	searchLink.onclick = function() {
    	    textbox.value = this.title;
    	    
    	    if ( eval( textbox.form ) != null ) {
    	    	textbox.form.submit();
    	    }
    	}
    	
    	searchLink.appendChild( document.createTextNode( term ) );
    	
    	var suggestCell = document.createElement( 'td' );
    	suggestCell.appendChild( searchLink );
    	
    	if ( suggestRow )
    	{
    	    suggestRow.appendChild( suggestCell );
    	    suggestBody.appendChild( suggestRow );
    	    suggestRow = null;
    	}
    	else
    	{
    	    suggestRow = document.createElement( 'tr' );
    	    suggestRow.appendChild( suggestCell );
    	}
    }
    
    if ( suggestRow )
    {
    	suggestBody.appendChild(
    	    document.createElement( 'td' ) );
    	suggestBody.appendChild( suggestRow );
    }
    
    document.body.appendChild( suggestDiv );
}