Javascript 问题

紫蘑菇

halo..i got some javascript problem..i need some help.
i have a hidden form value which contain of the TOTAL., let say the total is rm100.
then i have anohter two radio button and two text box, one radio button for one text box.
for the first radio button & textbox set, the user should insert the percentage; for the second radio button and terxt box set, the user should insert the ringgit malaysia.
then how can i get the value form the hidden and the text box and radio button, it will automatically calcualte the discount rate witout submit any button.
let say i have the hidden total is rm100, then i choose ringgit radio button and insert rm50 into the text box, then below there will display rm50(rm100-rm50)?..plz help..plz guide me some coding..thanx.

hui_wooi

可能说说你写了什么，这样我们比较容易帮到你。

hui_wooi

这是简单类似的做法，希望可以帮到你。

1. <script type="text/javascript" language="javascript">
   
2. function sum(val)
   
3. {
   
4.   var returnValue = "";
   
5.   returnValue = 100 - val;
   
6.   document.getElementById("display").innerHTML=returnValue;
   
7. }
   
8. </script>
   
9. <input type="text" onkeyup="total(this.value)">
   
10. <br>
    
11. <span id="display"></span>

复制代码