checkbox.htm

网上商城的设计与实现

// ************************************************************************<BR>
// Microsoft Script Library<BR>
// Visual InterDev 6.0 Checkbox 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 CreateCheckbox(strName,funcInit,objParent)
{
	if (typeof(strName) != 'string' || strName == '')
		return null;

	var strTag = '<' + 'INPUT TYPE="checkbox" id="' + strName + '" name="' + strName + '">';
	strTag += '<' + 'LABEL id="' + strName + '_LBL" name="' + strName + '_LBL" for="' + strName + '" htmlfor="' + strName + '"></LABEL>';

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

	var objCheckbox = document.all[strName];
	if (typeof(objCheckbox) != 'object')
		return null;
	var bNameExists = eval('typeof(' + strName + ') == "object"');
	if (!bNameExists)	
		eval(strName + ' = objCheckbox');

	//events
	CHK_ONCLICK = 'onclick';
	
	//intrinsic properties
	//		name AND id		RO
	//		disabled		RW
	//		value			RW

	//public methods
	objCheckbox.hide = _CHK_hide;
	objCheckbox.show = _CHK_show;
	objCheckbox.isVisible = _CHK_isVisible;
	objCheckbox.getChecked = _CHK_getChecked;
	objCheckbox.setChecked = _CHK_setChecked;
	objCheckbox.getCaption = _CHK_getCaption;
	objCheckbox.setCaption = _CHK_setCaption;
	objCheckbox.getDataSource = _CHK_getDataSource;
	objCheckbox.setDataSource = _CHK_setDataSource;
	objCheckbox.getDataField = _CHK_getDataField;
	objCheckbox.setDataField = _CHK_setDataField;
	objCheckbox.advise = _CHK_advise;
	objCheckbox.adviseDefaultHandler = _CHK_adviseDefaultHandler;
	objCheckbox.unadvise = _CHK_unadvise;
	objCheckbox.display = _CHK_display;
	
	//private members
	objCheckbox._objDataSource = null;
	objCheckbox._strDataField = '';
	objCheckbox._objLabel = eval(objCheckbox.name + '_LBL');
	objCheckbox._fireEvent = _CHK__fireEvent;
	
	// advise for default eventhandlers
	objCheckbox._objEventManager = CreateEventManager();
	objCheckbox._fireEvent('_CHK__onbeforefuncinit(' + objCheckbox.id + ')');
	objCheckbox._fireEvent(funcInit);
	return objCheckbox;
}

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

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

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

function _CHK_getCaption()
{	return this._objLabel.innerHTML;	}

function _CHK_setCaption(strCaption)
{	this._objLabel.innerHTML = strCaption;	}

function _CHK_getChecked()
{	return this.checked;	}

function _CHK_setChecked(value)
{	this.checked = (value != 'false' && value != '0' && value != '');	}

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

	if ((this._objDataSource != null) && (this._strDataField != ''))
	{
		if (this._objDataSource.isDHTMLAware())
		{
			this._objDataSource.unadvise(this._beforeUpdateID);
			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);
			
		this._afterOpenID = objDataSource.advise(RS_ONAFTEROPEN, this.id + '.setDataSource(' + objDataSource.id + ');');		
	}
	
	this._objDataSource = objDataSource;
	if ((objDataSource != null) && (this._strDataField != ''))
	{	
		if (objDataSource.isDHTMLAware())
		{
			this._beforeUpdateID = objDataSource.advise(RS_ONBEFOREUPDATE, '_CHK__onbeforeupdate(' + this.name + ');');
			this.dataSrc = '#' + objDataSource.getDHTMLDataSourceID();
			this.dataFld = this._strDataField;
		}	
		else
		{
			this._rowEnterID = objDataSource.advise(RS_ONROWENTER, '_CHK__onrowenter(' + objDataSource.getID() + ', ' + this.name + ', "' + this._strDataField + '");');
			this._rowExitID = objDataSource.advise(RS_ONROWEXIT, '_CHK_onrowexit(' + objDataSource.getID() + ', ' + this.name + ', "' + this._strDataField + '");');
		}
	}		
	return true;
}

function _CHK_getDataField()
{	return this._strDataField;	}	

function _CHK_setDataField(strDataField)
{
	if ((this._objDataSource != null) && (this._strDataField != ''))
	{
		if (this._objDataSource.isDHTMLAware())
		{
			this._objDataSource.unadvise(this._beforeUpdateID);
			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._beforeUpdateID = this._objDataSource.advise(RS_ONBEFOREUPDATE, '_CHK__onbeforeupdate(' + this.name + ');');
			this.dataSrc = '#' + this._objDataSource.getDHTMLDataSourceID();
			this.dataFld = strDataField;
		}	
		else
		{
			this._rowEnterID = this._objDataSource.advise(RS_ONROWENTER, '_CHK__onrowenter(' + this._objDataSource.getID() + ', ' + this.ID + ', "' + strDataField + '");');
			this._rowExitID = this._objDataSource.advise(RS_ONROWEXIT, '_CHK__onrowexit(' + this._objDataSource.getID() + ', ' + this.ID + ', "' + strDataField + '");');
		}
	}		
	return true;
}

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

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

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

function _CHK_display()
{	}

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

function _CHK__onrowenter(objRecordset,objCheckbox,strDataField)
{	objCheckbox.setChecked(objRecordset.fields.getValue(strDataField));	}

function _CHK__onrowexit(objRecordset,objTextBox,strDataField)
{
	var chkValue = objCheckbox.getChecked();
	if (typeof(chkValue) != 'undefined' && chkValue != null)
		objRecordset.fields.setValue(strDataField, chkValue);
}

function _CHK__onbeforefuncinit(objCheckbox)
{	objCheckbox.adviseDefaultHandler(objCheckbox.id, CHK_ONCLICK);	}

function _CHK__onbeforeupdate(objCheckbox)
{
	if (objCheckbox.checked == false)
	{
		//Make sure we have a default value
		objCheckbox.checked = true;
		objCheckbox.checked = false;
	}	
}