textbox.htm

网上商城的设计与实现

// ************************************************************************<BR>
// Microsoft Script Library<BR>
// Visual InterDev 6.0 Textbox Object for DHTML<BR>
// Copyright 1998 Microsoft Corporation. All Rights Reserved.<BR>
// <B>Do not modify in design view. Switch to source view.</B><BR>
// ************************************************************************<BR>
// <SCRIPT>
function CreateTextbox(strName,funcInit,objParent)
{
	if (typeof(strName) != 'string' || strName == '')
		return null;

	// constants
	TXT_TEXTBOX = 0;
	TXT_TEXTAREA = 1;
	TXT_PASSWORD = 2;

	var strTag = '<SPAN id="' + strName + '_SPAN">';
	strTag = strTag + '<INPUT type="text" name="' + strName + '" id="' + strName + '">';
	strTag = strTag + '</SPAN>'	

	if ((typeof(objParent) == 'object') && (objParent != null))
		objParent.insertAdjacentHTML('BeforeEnd',strTag);
	else
		document.write(strTag);

	//append public members
	var objTextbox = _TXT__createMembers(strName);
	if ((typeof(objTextbox) != 'object') || (objTextbox == null))
		return null;

	//events
	TXT_ONCHANGE = 'onchange';

	//private members
	objTextbox._objEventManager = null;
	objTextbox._objDataSource = null;
	objTextbox._strDataField = '';	
	objTextbox._nRowCount = 1;
	objTextbox._nStyle = TXT_TEXTBOX;

	// advise for default eventhandlers
	objTextbox._objEventManager = CreateEventManager();
	objTextbox._fireEvent('_TXT__onbeforefuncinit(' + objTextbox.id + ')');
	objTextbox._fireEvent(funcInit);
	return objTextbox;
}

function _TXT__createMembers(strName)
{
	var objParentSpan = document.all[strName + '_SPAN'];
	var objTextbox = objParentSpan.children(0);
	if (typeof(objTextbox) != 'object')
		return null;

	// ensure strName is defined in global namespace
	var bDefineAsGlobal =	eval('typeof(' + strName + ') == "undefined"') ||
							typeof(objParentSpan._makeglobal) != 'undefined';
	if (bDefineAsGlobal)
	{	// scoped within a form, define in global namespace
		eval(strName + ' = objTextbox');
		objParentSpan._makeglobal = 1;
	}

	objTextbox.hide = _TXT_hide;
	objTextbox.show = _TXT_show;
	objTextbox.isVisible = _TXT_isVisible;
	objTextbox.getColumnCount = _TXT_getColumnCount;
	objTextbox.setColumnCount = _TXT_setColumnCount;
	objTextbox.getRowCount = _TXT_getRowCount;
	objTextbox.setRowCount = _TXT_setRowCount;	
	objTextbox.getMaxLength = _TXT_getMaxLength;
	objTextbox.setMaxLength = _TXT_setMaxLength;
	objTextbox.getDataSource = _TXT_getDataSource;
	objTextbox.setDataSource = _TXT_setDataSource;
	objTextbox.getDataField = _TXT_getDataField;
	objTextbox.setDataField = _TXT_setDataField;
	objTextbox.getStyle = _TXT_getStyle;
	objTextbox.setStyle = _TXT_setStyle;
	objTextbox.advise = _TXT_advise;
	objTextbox.adviseDefaultHandler = _TXT_adviseDefaultHandler;
	objTextbox.unadvise = _TXT_unadvise;
	objTextbox.display = _TXT_display;
	objTextbox._fireEvent = _TXT__fireEvent;
	objTextbox.onbeforeupdate = _TXT__onbeforeupdate;
	objTextbox._objSpan = eval(strName + '_SPAN');
	return objTextbox;
}

function _TXT_hide()
{	this.style.visibility = 'hidden';	}	

function _TXT_show()
{	this.style.visibility = 'visible';	}	

function _TXT_isVisible()
{	return (this.style.visibility != 'hidden');	}	

function _TXT_getColumnCount()
{
	if (this._nStyle == TXT_TEXTAREA)
		return this.cols;
	else
		return this.size;
}	

function _TXT_setColumnCount(nColumnCount)
{
	if (!isNaN(parseInt(nColumnCount)) && nColumnCount > 0)
	{
		if (this._nStyle == TXT_TEXTAREA)
			this.cols = Number(nColumnCount);
		else
			this.size = Number(nColumnCount);	
		return true;
	}
	return false;
}

function _TXT_getRowCount()
{	return this._nRowCount;	}

function _TXT_setRowCount(nRowCount)
{
	if (!isNaN(parseInt(nRowCount)) && nRowCount > 0)
	{
		this._nRowCount = nRowCount;	
		if (this._nStyle == TXT_TEXTAREA)
			this.rows = Number(nRowCount);
		return true;
	}
	return false;
		
}

function _TXT_getMaxLength()
{
	if (this._nStyle == TXT_TEXTAREA)
		return this.cols;
	else
		return this.maxLength;
}

function _TXT_setMaxLength(nMaxLength)
{
	if (!isNaN(parseInt(nMaxLength)) && nMaxLength > 1 && this._nStyle != TXT_TEXTAREA)
	{
		this.maxLength = nMaxLength;	
		return true;
	}
	return false;
}

function _TXT_getDataSource()
{	return this._objDataSource;	}
	
function _TXT_setDataSource(objDataSource)
{
	if (typeof(objDataSource) != 'object')
		return false;

	if ((this._objDataSource != null) && (this._strDataField != ''))
	{
		if (this._objDataSource.isDHTMLAware())
		{
			this.dataSrc = '';
			this.dataFld = '';
		}
		else
		{
			this._objDataSource.unadvise(this._rowEnterID);
			this._objDataSource.unadvise(this._rowExitID);
		}
	}

	if ((this._objDataSource == null) || (objDataSource != null && this._objDataSource.id != objDataSource.id))
	{
		if (this._objDataSource != null)
			this._objDataSource.unadvise(this._afterOpenID);
		if (objDataSource != null)
			this._afterOpenID = objDataSource.advise(RS_ONAFTEROPEN, this.id + '.setDataSource(' + objDataSource.id + ');');		
	}
	
	this._objDataSource = objDataSource;

	if ((objDataSource != null) && (this._strDataField != ''))
	{	
		if (objDataSource.isDHTMLAware())
		{
			this.dataSrc = '#' + objDataSource.getDHTMLDataSourceID();
			this.dataFld = this._strDataField;
		}	
		else
		{
			this._rowEnterID = objDataSource.advise(RS_ONROWENTER, '_TXT__onrowenter(' + objDataSource.id + ', ' + this.id + ', "' + this._strDataField + '");');
			this._rowExitID = objDataSource.advise(RS_ONROWEXIT, '_TXT_onrowexit(' + objDataSource.id + ', ' + this.id + ', "' + this._strDataField + '");');
		}
	}		
	return true;
}

function _TXT_getDataField()
{	return this._strDataField;	}	

function _TXT_setDataField(strDataField)
{
	if ((this._objDataSource != null) && (this._strDataField != ''))
	{
		if (this._objDataSource.isDHTMLAware())
		{
			this.dataSrc = '';
			this.dataFld = '';
		}
		else
		{
			this._objDataSource.unadvise(this._rowEnterID);
			this._objDataSource.unadvise(this._rowExitID);
		}
	}

	this._strDataField = strDataField;

	if ((this._objDataSource != null) && (this._strDataField != ''))
	{	
		if (this._objDataSource.isDHTMLAware())
		{
			this.dataSrc = '#' + this._objDataSource.getDHTMLDataSourceID();
			this.dataFld = strDataField;
		}	
		else
		{
			this._rowEnterID = this._objDataSource.advise(RS_ONROWENTER, '_TXT__onrowenter(' + this._objDataSource.id + ', ' + this.id + ', "' + strDataField + '");');
			this._rowExitID = this._objDataSource.advise(RS_ONROWEXIT, '_TXT__onrowexit(' + this._objDataSource.id + ', ' + this.id + ', "' + strDataField + '");');
		}
	}		
	return true;
}

function _TXT_getStyle()
{	return this._nStyle;	}

function _TXT_setStyle(nStyle)
{
	if (!isNaN(parseInt(nStyle)) && (nStyle >= TXT_TEXTBOX) && (nStyle <= TXT_PASSWORD))
	{
		if (this._nStyle != nStyle)
		{	// type of tag needs to be changed
			// save current state
			var bVisible = this.isVisible();
			var bDisabled = this.disabled;
			var value = this.value;
			var strName = this.name;
			var nRowCount = this.getRowCount();
			var nColCount = this.getColumnCount();
			var nMaxLength = this.getMaxLength();
			var objEventManager = this._objEventManager;
			var objDataSource = this._objDataSource;
			var strDataField = this._strDataField;

			// replace previous tag with new tag
			var strTag;
			if (nStyle == TXT_TEXTAREA)
				strTag = '<TEXTAREA name="' + strName + '" id="' + strName + '" rows=' + nRowCount + ' style="visiblity:hidden"></TEXTAREA>';
			else if (nStyle == TXT_PASSWORD)
				var strTag = '<INPUT type="password" name="' + strName + '" id="' + strName + '" style="visiblity:hidden">';
			else
				var strTag = '<INPUT type="text" name="' + strName + '" id="' + strName + '" style="visiblity:hidden">';
			this._objSpan.innerHTML = strTag;

			// restore previous state
			var objTextbox = _TXT__createMembers(strName);
			if ((typeof(objTextbox) != 'object') || (objTextbox == null))
				return false;

			objTextbox._nStyle = nStyle;
			objTextbox.value = value;
			objTextbox.disabled = bDisabled;
			objTextbox.setRowCount(nRowCount);
			objTextbox.setColumnCount(nColCount);
			objTextbox.setMaxLength(nMaxLength);
			objTextbox.setDataSource(objDataSource);
			objTextbox.setDataField(strDataField);
			if (bVisible)	objTextbox.show();

			objTextbox._objEventManager = objEventManager;
			if (objEventManager != null)
			{	//re-attach all event handlers
				var nEvents = objEventManager.getEventCount();
				for (var i=0; i < nEvents; i++)
					eval('objTextbox.' + objEventManager.getEvent(i) + ' = _TXT__fireEvent;');
			}
		}
		return true;
	}
	return false;
}

function _TXT_advise(strEvent,funcToCall)
{
	var nAdviseID = this._objEventManager.advise(strEvent,funcToCall);
	if (nAdviseID != -1)
		eval('this.' + strEvent + ' = _TXT__fireEvent;');
	
	return nAdviseID;
}

function _TXT_adviseDefaultHandler(strName,strEvent)
{
	var nAdviseID = this._objEventManager.adviseDefaultHandler(strName,strEvent);
	if (nAdviseID != -1)
		eval("this." + strEvent + " = _TXT__fireEvent;");
}

function _TXT_unadvise(strEvent,nAdviseID)
{	return this._objEventManager.unadvise(strEvent,nAdviseID);	}

function _TXT_display()
{	}

function _TXT__fireEvent(funcToFire)
{
	if (typeof(funcToFire) == 'undefined')
	{
		if (this._objEventManager != null)
			this._objEventManager.fireEvent('on' + window.event.type);
	}
	else
		_EM__fireEvent(funcToFire);
}

function _TXT__onrowenter(objRecordset,objTextbox,strDataField)
{	objTextbox.value = objRecordset.fields.getValue(strDataField) + '';	}

function _TXT__onrowexit(objRecordset,objTextbox,strDataField)
{
	var txtValue = objTextbox.value;
	if (typeof(txtValue) != 'undefined')
		objRecordset.fields.setValue(strDataField, txtValue);
}

function _TXT__onbeforeupdate()
{
	var objTextbox = window.event.srcElement;
	if (objTextbox._objDataSource != null && objTextbox._strDataField != '')
	{
		if (typeof(objTextbox._objDataSource._rsRDS) != 'undefined')
		{
			var fieldType = objTextbox._objDataSource._rsRDS.recordset.Fields(objTextbox._strDataField).type;
			//adDate, adDBDate, adDBTime, adDBTimeStamp
			if ((fieldType == 7) || (fieldType == 133) || (fieldType == 134) || (fieldType == 135))
			{
				if (!isNaN(Date.parse(objTextbox.value)))
					objTextbox._objDataSource.fields.setValue(objTextbox._strDataField, objTextbox.value);
			}
		}
	}	
}

function _TXT__onbeforefuncinit(objTextbox)
{	objTextbox.adviseDefaultHandler(objTextbox.id, TXT_ONCHANGE);	}