使用jquery在keyup上减去值 [英] Substracting values on keyup using jquery

问题描述

我在表单中输入以下内容. total(输入名称)和balance(输入名称)的值相同.当任何用户在输入中输入paid_amount的值时，我想从总数中自动减去paid_amount的值，并将结果作为balance的值输入到输入中.

能否请您向我展示如何使用jquery做到这一点.

谢谢

<input type="text" name="total" id="total" value="<?php echo $total;?>" />

<input type="text" name="paid_amount" id="paid_amount" value="" />

<input type="text" name="balance" id="balance" value="<?php echo $total;?>" />

解决方案

$('#paid_amount').on('keyup', function() {
   if($.trim(this.value).length) {
     var balance = parseFloat($('#total').val()).toFixed(2) - 
                   parseFloat(this.value).toFixed(2);
     $('#balance').val(balance);
   }
});

I have the following inputs in my form. The value of total(input name) and balance(input name) are the same. When any user puts the value of paid_amount in the input, I want to automatically subtract the paid_amount value from the total and put the result as value of balance in the input.

Could you please show me how to do this using jquery.

Thanks

<input type="text" name="total" id="total" value="<?php echo $total;?>" />

<input type="text" name="paid_amount" id="paid_amount" value="" />

<input type="text" name="balance" id="balance" value="<?php echo $total;?>" />

解决方案

$('#paid_amount').on('keyup', function() {
   if($.trim(this.value).length) {
     var balance = parseFloat($('#total').val()).toFixed(2) - 
                   parseFloat(this.value).toFixed(2);
     $('#balance').val(balance);
   }
});

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