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<HEAD>
<SCRIPT type="text/javascript" language="javascript">
var hidValue = " ";//需要保存到数据库的
var showValue = " ";//显示给客户看的
var txtExp;
var hidExp;
var txtNum;
window.onload = function()
{
txtExp = document.getElementById("txtExpression");
hidExp = document.getElementById("hidExpression");
txtNum = document.getElementById("txtNumber");
}
function addPro(elementName)
{
var Oselect = document.getElementById(elementName);
var oOption = Oselect.options;
hidValue = hidValue + oOption[Oselect.selectedIndex].value+" ";
showValue = showValue + oOption[Oselect.selectedIndex].text+" ";
txtExp.value=showValue;
hidExp.value=hidValue;
}
function addNumber()
{
if(!isNaN(txtNum.value))
{
hidValue = hidValue + txtNum.value+" ";
showValue = showValue + txtNum.value+" ";
txtExp.value=showValue;
hidExp.value=hidValue;
}
}
function del()
{
if(hidValue.length>0)
{
hidValue = hidValue.substring(0,hidValue.substr(0,hidValue.length-1).lastIndexOf(" ")) + " ";
showValue = showValue.substring(0,showValue.substr(0,showValue.length-1).lastIndexOf(" ")) + " ";
txtExp.value=showValue;
hidExp.value=hidValue;
}
else
alert("表达式已为空,无法继续删除!");
}
</SCRIPT>
</HEAD>
<BODY>
<form>
<table width="100%" border="1">
<tr>
<td align="right" style="width: 255px">计算表达式:</td>
<td align="left" colspan="2"><input name="txtExpression" type="text" readonly="readonly" id="txtExpression" style="width:269px;" />
<input type="button" onclick="del()" value="删 除" id="btnDelExpression" title="每次只撤销一次输入" /></td>
</tr>
<tr>
<td align="right" style="width: 255px; height: 28px;">
<select name="ddlProperty" id="ddlProperty" title="请选择属性名称" style="width:141px;">
<option value="10">行业</option>
<option value="11">类别</option>
<option value="12">形式</option>
<option value="13">运营商/企业</option>
<option value="14">品牌/部门</option>
<option value="15">业务</option>
<option value="16">宽</option>
<option value="17">高</option>
</select>
</td>
<td align="center" style="height: 28px">
<select name="ddlOperator" id="ddlOperator" title="请选择运算符" onchange="getid()" style="width:141px;">
<option value="0">--运算符--</option>
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
<option value="(">(</option>
<option value=")">)</option>
<option value=""></option>
<option value=""></option>
<option value=""></option>
<option value=""></option>
<option value=""></option>
<option value=""></option>
</select>
</td>
<td align="left" style="height: 28px"><input name="txtNumber" type="text" value="234" id="txtNumber" title="请输入要加入的数字" /></td>
</tr>
<tr>
<td align="right" style="width: 255px; height: 28px;"><input type="button" value="加 入" onclick="addPro('ddlProperty')" id="btnPropertyName" /></td>
<td align="center" style="height: 28px"><input type="button" name="btnOperator" value="加 入" onclick="addPro('ddlOperator')" id="btnOperator" /></td>
<td align="left" style="height: 28px"><input type="button" name="btnNumber" value="加 入" onclick="addNumber()" id="btnNumber" /></td>
</tr>
</table>
<input type="hidden" id="hidExpression" value="" />
</body>