根据更改输入计算一个变量 [英] Calculate one variable based on changing input

问题描述

我有以下函数：

  function updateInput（ish）{ 
 document.getElementById（BetAmount）。value = ish; 
} 
  

我有以下HTML输入：

 < input class =defaultTexttype =numbername =BetAmountid =BetAmountonchange = updateInput（THIS.VALUE） > 
 
< input type =numbername =PotentialGainid =PotentialGain/> 
  

当用户输入一个下注金额号码（ BetAmount PotentialGain ，例如，可以通过将一个常数乘以用户输入的指定下注量来找到。

我对JavaScript并不是很熟悉，因此非常感谢所有帮助！

解决方案

您的代码几乎正确 - 您在 BetAmount 字段所以没有可见的变化。

将您的代码更改为：

  document.getElementById（PotentialGain）。value = ish; 
  

以下是工作演示。我将事件更改为 onkeyup ，因为 onchange 仅在模糊时发生 - 即当一个领域失去焦点。

I have the following function:

function updateInput(ish){
    document.getElementById("BetAmount").value = ish;
}

I have the following HTML inputs:

<input class="defaultText" type="number" name="BetAmount" id="BetAmount" onchange="updateInput(this.value)">

<input type="number" name="PotentialGain" id="PotentialGain" />

When users enter in a bet amount number(BetAmount), I would like to instantly show a calculated PotentialGain, which, for example, can be found by multiplying a constant by the specified bet amount entered in by the user.

I'm not very familiar with JavaScript, so any help is greatly appreciated!

解决方案

Your code is almost correct - you are showing the result in the BetAmount field so no change is visible.

Change your code to:

document.getElementById("PotentialGain").value = ish;

Here's a working demo. I changed the event to onkeyup as onchange only happens on blur - i.e. when a field loses focus.

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