在HTML表单值更改时动态更新highcharts数据

时间:2017-06-02 21:57:57

标签: javascript html highcharts

我开始学习编码并尝试创建贷款/抵押贷款计算器作为我学习的一部分。我试图通过利用Highcharts来绘制结果更进一步,但无法按照我的意愿使其工作。

理想情况下,我希望馅饼能够使用计算的新值动态更新(即"每月还款"和"仅每月利息")。

到目前为止,我只能通过点击"计算"来重新绘制它。按钮,但只有在按下按钮至少两次时才会使用正确的新值进行更新。

示例:https://codepen.io/sonofauley/pen/rwNLom

<body onload="calculate();">

<form method="POST" name="calc" onsubmit="calculate(); return false;">
    <label>Amount</label>
    <input type="textbox" id="loan" value="100000"><br>
    <label>Years</label>
    <input type="textbox" id="years" value="25"><br>
    <label>Rate (%)</label>
    <input type="textbox" id="rate" value="2.50" onkeyup="calculate"><br>
    <input type="submit" value="Calculate" id="btn"><br>
    <label>Monthly Repayment</label>
    <input type="textbox" id="monthlyRepayment"><br>
    <label>Monthly Interest Only</label>
    <input type="textbox" id="interest"><br>
    <label>Monthly Capital Repayment</label>
    <input type="textbox" id="capitalRepayment">
    <label>Total Interest</label>
    <input type="textbox" id="totalInterest"><br>
    </form>

    <div id="container" style="height: 300px"></div>

    </body>

//the below script is in its own js file "cacl.js"
$(document).on("keyup", calculate());

function calculate() {
  var p = document.querySelector("#loan").value;
  var years = document.querySelector("#years").value;
  var rate = document.querySelector("#rate").value;
  var r = rate / 100 / 12;
  var n = years * 12;
  var m1 = r * Math.pow(1 + r, n);
  var m2 = Math.pow(1 + r, n) - 1;
  var m = (p * (m1 / m2)).toFixed(2);
  var I = ((p - n) / m).toFixed(2);
  var ti = m * n - p;
  var mr = (m - I).toFixed(2);
  document.querySelector("#monthlyRepayment").value = m;
  document.querySelector("#interest").value = I;
  document.querySelector("#totalInterest").value = ti;
  document.querySelector("#capitalRepayment").value = mr;
    }

//the below script is in a separate js file "chart.js"
$(function () {

$('#btn').click(function(){
    var val1,
        val2,
        options;

    val1 = parseFloat($('input[id=monthlyRepayment]').val());
    val2 = parseFloat($('input[id=capitalRepayment]').val());

    options = {
        series: [{
            type: 'pie',
            name: 'Browser share',
            data: [val1,val2]
        }]
    };

    $('#container').highcharts(options);
});


});

1 个答案:

答案 0 :(得分:0)

计算出的值不正确会导致图表形成错误。实际上,您必须在按钮点击功能上调用calculate()

用此

替换现有(部分)
$(function() {
  $('#btn').click(function() {
    calculate();
    var val1,
      val2,
      options;

    val1 = parseFloat($('input[id=monthlyRepayment]').val());
    val2 = parseFloat($('input[id=capitalRepayment]').val());

    options = {
      series: [{
        type: 'pie',
        name: 'Browser share',
        data: [{name:"Monthly Repayment",y:val1},{name:"Capital Repayment",y:val2}]
      }]
    };

    $('#container').highcharts(options);
  });
});

codepen演示