传递给PHP表单时，javascript动态变量的未定义索引

问题描述

 < form action =testing.phpmethod =POSTid =addrecieptname =addreciept> 
单元< input name =unit1type =textid =unit1size =17onkeyup =calc（）value =0/> 
 Rate< input name =rate1type =textid =rate1size =17value =0onkeyup =calc（）/> 
金额<输入名称=amount1type =textid =amount1size =17disabled =true/> 
 Total Amount：< input type =textname =totalamountid =totalamountdisabled =truevalue => 
付款金额：< input type =textname =amount_paidid =amount_paidonkeyup =calc_balance（）/> 
余额：< input type =textname =balanceid =balancedisabled =truevalue =0> 
< center> 
< input type =submitvalue =Saveclass =button> 
< / center> 
< / form> 
 
< script> 
函数calc（）
 {
 unit = document.getElementById（'unit1'）。value; 
 rate = document.getElementById（'rate1'）。value; 
金额=单位*费率; 
 document.getElementById（'amount1'）。value = amount; 
 total_amount = document.getElementById（'amount1'）。value; 
 document.getElementById（'totalamount'）。value = total_amount; 
} 
函数calc_balance（）
 {
 tota_amount = document.getElementById（'totalamount'）.value; 
 paid_amount = document.getElementById（'amount_paid'）。value; 
 document.getElementById（'balance'）。value = tota_amount-paid_amount; 
} 
< / script> 
  

我最近测试了在网上发布的脚本，它工作正常，但我想我做错了一些事情： '（我很困难，因为像amount1，totalamount和balance这样的动态变量导致了未定义的索引amount1等的错误等）。

plz计算出来： （

）

php简单易懂>>

 <？php 
 echo $ _POST ['unit1']; 
 echo $ _POST ['rate1']; 
 echo $ _POST ['amount1']; 
？> 
  

解决方案

form-elements在禁用时不会被提交（amount1，totalamount和平衡被禁用）

使用只读属性

<form action="testing.php" method="POST" id="addreciept" name="addreciept">
Unit<input name="unit1" type="text" id="unit1" size="17" onkeyup="calc()"   value="0"/>
Rate<input name="rate1" type="text" id="rate1" size="17" value="0" onkeyup="calc()"  />
Amount<input name="amount1" type="text" id="amount1" size="17"  disabled="true"   />
Total Amount: <input type="text" name="totalamount" id="totalamount" disabled="true"   value=""> 
Amount Paid: <input type="text" name="amount_paid" id="amount_paid" onkeyup="calc_balance()" />
Balance: <input type="text" name="balance" id="balance" disabled="true"  value="0"> 
<center>
<input type="submit" value="Save " class="button" >
</center>
</form>

<script>
function calc()
{
unit=document.getElementById('unit1').value;
rate=document.getElementById('rate1').value;
amount=unit*rate;
document.getElementById('amount1').value=amount;
total_amount=document.getElementById('amount1').value;
document.getElementById('totalamount').value=total_amount;
}
function calc_balance()
{
tota_amount=document.getElementById('totalamount').value;
paid_amount=document.getElementById('amount_paid').value;
document.getElementById('balance').value=tota_amount-paid_amount;
}
</script>

I recently tested the script posted on net , it works, but I guess I am doing something wrong :'( i am badly stuck in it, because the dynamic variables like, amount1, totalamount & balance are causing error of undefined index amount1 etc etc

plz figure it out :(

php is just simple >>

<?php
echo $_POST['unit1'];
echo $_POST['rate1'];
echo $_POST['amount1'];
?>

解决方案

form-elements will not be submitted when they are disabled(amount1,totalamount and balance are disabled)

Use the readonly-attribute instead

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