基于单个输入字段的动画输出 [英] Animated output based on single input field

问题描述

我正在尝试对基于单个输入值* 4.5计算得出的输出进行动画处理.计算本身是有效的，但是我无法弄清楚如何为该值设置动画，我想做的是使输出计数很快达到计算出的值.我发现 https://codepen.io/shivasurya/pen/FatiB 具有计算我想实现的动画，但无法弄清楚如何在我的输入和输出字段中实现它，到目前为止，我有:

I'm trying to animate an output which is calculated based on a single input value * 4.5. The calculation itself is working but I cannot figure out how to animate the value, what I'm trying to do is have the output count up to the calculated value quite quickly. I've found https://codepen.io/shivasurya/pen/FatiB which has the count animation I'd like to implement, but can't figure out how to implement it to my input and output fields, so far I have:

<form id="ewcalc" oninput="updateOutput()"> 
<input name="income" type="number" value="0" />
<output for="income" name="loan">0</output>
</form>

<script type="text/javascript">
function updateOutput() {
var form = document.getElementById("ewcalc");

form.elements["loan"].value=eval(parseInt(form.elements["income"].value) * 4.5);
}
</script>

关于如何实现动画的任何建议?我已经尝试了好几种方法，但是都没有用，如果尝试使用onsubmit会出错.

Any suggestions how I can implement the animation? I've tried several things, none of which are working, and getting errors if I try using onsubmit.

推荐答案

您可能要使用

You'll probably want to use requestAnimationFrame like this:

function updateOutput() {
  var income = $("#income").val() * 4.5;
  var output = Number($("#loan").text());

  if (income !== output) {
    if (income > output)
      output += 0.5;
    else if (income < output)
      output -= 0.5;

    $("#loan").text(output);
    requestAnimationFrame(updateOutput);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<form id="ewcalc" oninput="updateOutput()">
  <input id="income" type="number" value="0" />
  <output for="income" id="loan">0</output>
</form>

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