如何显示ID =“grand”中所有id =“total”的总值。这是我的整个代码。只应使用HTML和Javascript。我不知道如何增加每个的值。当用户选中复选框时,javascript会被执行。该复选框的值将乘以下拉值的值。那么产品将显示在输入id =“total”中。我想在输入ID总结所有的价值=总并且在输入ID显示它=“盛大”如何显示多个文本字段的总值?
<p><center><font size="5">Total Amount: <input type="text" id="grand" name="grand" value="P0.00"></input></p>
<table border=1>
<tr>
<td colspan=3><h2>Specialty Cakes</h2></td>
</tr>
<tr>
<td><center><img src=special\blackforest_small.jpg ><br>Black Forest</td>
<td><input type="checkbox" id="check1" name="check1" value="550.00"onclick="special1()">Buy P550.00</input><br><input type="text" id="total1" name="total1" value="P0.00"size="8"></input><br>
QTY: <select id="qty1" name="qty1" onchange="special1()">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
</select>
</td>
</tr>
<tr>
<td><center><img src=special\chocolata_small.jpg><br>Chocolata</center></td>
<td><input type="checkbox" id="check2" name="check2" value="550.00"onclick="special2()">Buy P500.00</input><br><input type="text" id="total2" name="total2" value="P0.00"size="8"></input><br>
QTY: <select id="qty2" name="qty2" onchange="special2()">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
</select>
</td>
</tr>
</table>
<script>
function special1(){
var m = document.getElementById("check1").checked;
var x = document.getElementById("check1").value;
var y = document.getElementById("qty1").value;
var z = 0;
if (m == true){
z = "P" + x * y;
}
document.getElementById("total1").value = z;
}
function special2(){
var m = document.getElementById("check2").checked;
var x = document.getElementById("check2").value;
var y = document.getElementById("qty2").value;
var z = 0;
if (m == true){
z = "P" + x * y;
}
document.getElementById("total2").value = z;
}
</script>
我编辑的主要问题要好好理解。请看一下 – Crazy1923 2014-10-20 10:36:07