Javascript，Sum Textfield不會顯示SUM

Question

但我想總結兩個文本框，它們將自動顯示「Total」文本框中的答案。試過onkeyup和onchange。但它不會工作。這裏是我的HTML代碼：

<input type="text" value="$0.00" size="6" maxlength="6" name="form[family_home]" id="family_home" onfocus="if (this.value == '$0.00') {this.value=''}" class="assets rsform-input-box"> 
<input type="text" value="$0.00" size="6" maxlength="6" name="form[home_contents]" id="home_contents" onfocus="if (this.value == '$0.00') {this.value=''}" class="assets rsform-input-box"> 

<input type="text" value="Total" size="20" name="form[Total]" id="Total" onchange="calculateText();" readonly="readonly" class="rsform-input-box"> 

和這裏的腳本：

<script type="text/javascript"> 
function calculateText(){ 

var op1=document.getElementById('family_home'); 
var op2=document.getElementById('home_contents'); 
var result=document.getElementById('Total'); 
if(op1.value=="$0.00" || op1.value!=parseFloat(op1.value)) op1.value=0; 
if(op2.value=="$0.00" || op2.value!=parseFloat(op2.value)) op2.value=0; 
result.value=0; 

result.value=parseFloat(result.value); 


result.value=parseFloat(result.value)+parseFloat(op1.value)+parseFloat(op2.value); 
</script> 

Answer 1

你需要把onchange事件上，你正在修改的輸入：family_home和home_contents