auto_tests/tests/update_while_panning.js

   1 /**
   2  * @fileoverview Regression test for a bug involving data update while panning.
   3  *
   4  * See http://stackoverflow.com/questions/9528173
   5  *
   6  * @author dan@dygraphs.com (Dan Vanderkam)
   7  */
   8 describe("update-while-panning", function() {
   9
  10 beforeEach(function() {
  11   document.body.innerHTML = "<div id='graph'></div>";
  12 });
  13
  14 afterEach(function() {
  15 });
  16
  17 // This tests the following sequence:
  18 // 1. Begin dragging a chart (x-panning)
  19 // 2. Do a data update (updateOptions({file: ...}))
  20 // 3. Verify that the y-axis is still well-defined.
  21 it('testUpdateWhilePanning', function() {
  22   var sinewave = function(start, limit, step) {
  23     var data = [];
  24     for (var x = start; x < limit; x += step) {
  25       data.push([x, Math.sin(x)]);
  26     }
  27     return data;
  28   };
  29
  30   var opts = {
  31     width: 480,
  32     height: 320,
  33     valueRange: [-2, 2],
  34     labels: ['X', 'Y']
  35   };
  36
  37   var graph = document.getElementById("graph");
  38
  39   var g = new Dygraph(graph, sinewave(0, 6, 0.1), opts);
  40   assert.deepEqual([-2, 2], g.yAxisRange());
  41
  42   // Start a pan, but don't finish it yet.
  43   DygraphOps.dispatchMouseDown_Point(g, 200, 100, {shiftKey: true});
  44   DygraphOps.dispatchMouseMove_Point(g, 100, 100, {shiftKey: true});
  45   assert.deepEqual([-2, 2], g.yAxisRange());
  46
  47   // Now do a data update. y-axis should remain the same.
  48   g.updateOptions({file: sinewave(0, 7, 0.1)});
  49   assert.deepEqual([-2, 2], g.yAxisRange());
  50
  51   // Keep the pan going.
  52   DygraphOps.dispatchMouseMove_Point(g, 50, 100, {shiftKey: true});
  53   assert.deepEqual([-2, 2], g.yAxisRange());
  54
  55   // Now finish the pan.
  56   DygraphOps.dispatchMouseUp_Point(g, 100, 100, {shiftKey: true});
  57   assert.deepEqual([-2, 2], g.yAxisRange());
  58 });
  59
  60
  61 });