Trigger change on selecting dataset [Amcharts Multiple Data Sets chart]

问题

is it possible to trigger a 'change' on the select element of the amcharts multiple data set chart that they have provided.?

$(".amChartsDataSetSelector").find("select").val("2").trigger("change");

This is the code i tried,what it does basically is change the select option to the one i have selected ,but it doesn't change the chart accordingly.

Is there any other alternatives to this method?

Here's my fiddle:

Here's the original link to the chart on amcharts.

回答1:

The jQuery .trigger( works only when events are bound using jQuery .on function (or any event binding function). Below is a simple example to show you what was happening.

Jump to #Solution below to skip this demo.

$(function() {
  var el = document.getElementById('checkEvent');
  if (el.addEventListener) {
    el.addEventListener("change", checkEvent, false);
  } else {
    el.attachEvent('change', checkEvent);
  }

  function checkEvent() {
    alert('Event Check');
  }

  $('#changeDDValue').click(function() {
    $('#checkEvent').val("2").change();
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select id="checkEvent" style="width: 180px;">
  <option value="0">first data set</option>
  <option value="1">second data set</option>
  <option value="2">third data set</option>
  <option value="3">fourth data set</option>
</select>
<button id="changeDDValue">Change DataSet</button>

Solution:

Added a button #change to set a different dataset like below,

$('#change').click(function () {
    var selectEl = $(".amChartsDataSetSelector").find("select").val("2").get(0);
    fireEvent.call(selectEl, 'change');
});

And then use fireEvent function below to trigger the change event instead of trigger('change'),

//http://stackoverflow.com/a/2490876/297641
function fireEvent(eventName) {
    var event; // The custom event that will be created

    if (document.createEvent) {
        event = document.createEvent("HTMLEvents");
        event.initEvent(eventName, true, true);
    } else {
        event = document.createEventObject();
        event.eventType = eventName;
    }

    event.eventName = eventName;

    if (document.createEvent) {
        this.dispatchEvent(event);
    } else {
        this.fireEvent("on" + event.eventType, event);
    }
}

Fixed jsFiddle

来源：https://stackoverflow.com/questions/26562276/trigger-change-on-selecting-dataset-amcharts-multiple-data-sets-chart

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