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我从数据库中拉取项目,取出成本和用户定义的数量并显示总计。我的目标是用户可以计算25行以上的耗材,并在最后添加总计。我在计算成本*数量时无法刷新页面并丢失所有其他数据。我相当新的JavaScript,我不明白为什么这不适合我。Javascript计算动态不提交按钮
<script type="text/javascript">
function updatesum(cost, quant, tot) {
var qty = document.getElementsByid(quant).value;
var price = document.getElementsByid(cost).value;
document.getElementById(tot).value = (price * qty);
}
</script>
<cfoutput>
<cfform>
<table>
<tr>
<td colspan=3>Supplies</td>
</tr>
<tr>
<td>Date</td>
<td>Supply</td>
<td>Cost</td>
<td>Quantity</td>
<td>Total</td>
</tr>
<tr>
<td><cfinput type="datefield" name="date_01" id="date_01"></td>
<td><cfselect name="supply_01" onChange="">
<option value="0"></option>
<cfloop query="supplies">
<option value="#supplies.id#">#supplies.supply#</option>
</cfloop>
</cfselect></td>
<td><cfinput type="integer" name="unitCost_01" id="unitCost_01" value="" onChange="updatesum(unitCost_01, quantity_01, total_01"></td>
<td><cfinput type="integer" name="quantity_01" id="quantity_01" onChange="updatesum(unitCost_01, quantity_01, total_01)"></td>
<td><cfinput type="integer" readonly="yes" name="total_01" id="total_01" value=""></td>
</tr>
</table>
</cfform>
</cfoutput>
从简单的阅读,看来你要覆盖每个输入场总,所以一旦你改变了第二个输入字段,删除以前的值 – Patrick
什么是'document.getElementsByid()'? –
另外好点,它是document.getElementById()。区分大小写。 –