检查我的codepen。进入点击时触发 html 按钮

Question

所以在 http://codepen.io/urketadic/pen/JKbddV 上查看我的代码笔我需要按钮来播放它的动画，即使我不点击它而是按回车键。我需要做什么？

      $(document).ready(function() {
  var secondsPerMin = 60;
  var minsPerHour = 60;
  var hoursPerDay = 24;
  var daysPerWeek = 7;
  var weeksPerYear = 52;
  var yearsAlive;
  var secondsPerDay = secondsPerMin * minsPerHour * hoursPerDay;

  function calculateSeconds(yearsAlive) {
    $("#output").val("For "+ yearsAlive + " years you have lived " + secondsPerDay * daysPerWeek * weeksPerYear * yearsAlive + " seconds.");
  }

$("#inpute").on("keydown", function(e) {
    if (e.keyCode == 13) {
      e.preventDefault();
      var yearsAlive = $('#inpute').val();
    if (isNaN(yearsAlive)) {
     $("#output").html("Your age must be a number.");
    }
    else {
      calculateSeconds(yearsAlive);
    }
  }
  });

  $("#buttoninput").on('click', function() {
    var yearsAlive = $('#inpute').val();
    if (isNaN(yearsAlive)) {
     $("#output").html("Your age must be a number.");
    }
    else{
    calculateSeconds(yearsAlive);
    }
  });
});

Answer 1

您正试图在声明之前使用 yearsAlive 变量。尝试：

$("#inpute").on("keydown", function(e) {
  if (e.keyCode == 13) {
    var yearsAlive = $('#inpute').val();
    calculateSeconds(yearsAlive);
    e.preventDefault();
  }
});

Answer 2

请看下面的方法：

$(document).ready(function() {
  var secondsPerMin = 60;
  var minsPerHour = 60;
  var hoursPerDay = 24;
  var daysPerWeek = 7;
  var weeksPerYear = 52;
  var yearsAlive;
  var secondsPerDay = secondsPerMin * minsPerHour * hoursPerDay;

  function calculateSeconds(yearsAlive) {
    $("#output").val("For " + yearsAlive + " years you have lived " + secondsPerDay * daysPerWeek * weeksPerYear * yearsAlive + " seconds.");
  }

  $("#buttoninput").on('click', function() {
    var yearsAlive = $('#inpute').val();
    if (isNaN(yearsAlive)) {
      $("#output").html("Your age must be a number.");
    } else {
      calculateSeconds(yearsAlive);
    }
  });

  $("#inpute").on("keydown", function(e) {
    if (e.keyCode == 13) {
      e.preventDefault();
      $("#buttoninput").click();
    }
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>

<div class="container">
  <div class="jumbotron">
    <div class="page-header">
      <h1 class="text-center animated bounceInDown">How old are you? <small>IN SECONDS.</small></h1>
    </div>


    <div class="input">
      <input type="text" id="inpute" class="col-xs-12 col-sm-6 col-md-8 animated bounceInLeft" placeholder="write age">
      <button type="submit" id="buttoninput" class="col-sm-4 btn btn-default btn-danger animated bounceInRight">Calculate</button>
    </div>

    <div class="output">
      <output id="output" placeholder="output" class="col-xs-12">
    </div>

  </div>

Answer 3

试试看：

$(document).ready(function() {
  var secondsPerMin = 60;
  var minsPerHour = 60;
  var hoursPerDay = 24;
  var daysPerWeek = 7;
  var weeksPerYear = 52;
  var yearsAlive;
  var secondsPerDay = secondsPerMin * minsPerHour * hoursPerDay;

  function calculateSeconds(yearsAlive) {
    $("#output").val("For "+ yearsAlive + " years you have lived " +     secondsPerDay * daysPerWeek * weeksPerYear * yearsAlive + " seconds.");
  };

  $("#buttoninput").on('click', function() {
    var yearsAlive = $('#inpute').val();
    if (isNaN(yearsAlive)) {
     $("#output").html("Your age must be a number.");
    }
    else{
    calculateSeconds(yearsAlive);
    }
  });


  $("#inpute").on("keydown", function(e) {
    if (e.keyCode == 13) {
      e.preventDefault();
      $("#buttoninput").click(); // just read you want the click behaviour..
    }
  });
});

检查我的codepen。进入点击时触发 html 按钮

Check my codepen. Triggering html button on enter click

javascript

jquery

css

enter

keycode