JQuery：更改其他输入字段的值时更改值

问题描述

我已经尝试了一段时间，而且我看起来似乎无法看到让它开始工作

 < input class =span4 input-bigid =dare_pricename =price size =30type =textonChange =updatePrice（）/> 
< input class =span4 input-bigid =total_price_amountreadonly =readonlyvalue =/> 
 
 
 function updatePrice（）{ 
 var price = $（＃dare_price）。val（）; 
 var total =（price + 1）* 1.05; 
 $（$ total_price_amount）。val（total）; 
} 
  

。

I want to change the value of an input field whenever the value of another one is changed.

I've tried for a while and I can't seem to get it to work

<input class="span4 input-big" id="dare_price" name="price" size="30" type="text" onChange="updatePrice()" />
<input class="span4 input-big" id="total_price_amount" readonly="readonly" value=""/>​


function updatePrice() {
    var price = $("#dare_price").val();
    var total = (price + 1) * 1.05;
    $("$total_price_amount").val(total);
}​

Here's the fiddle.

解决方案

$("#dare_price").change(function(){
   var total = Number($this).val()) + ...;
   $('#total_price').val(total);
});

If you programatically change the values, you need to pipeline them through your method -

function changePrice(value){
   $('#dare_price').val(value);
   $('#dare_price').trigger('change');
}

Updated DEMO for this event-driven approach.

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