auto_tests/tests/Util.js

   1 /**
   2  * @fileoverview Utility functions for Dygraphs.
   3  *
   4  * @author konigsberg@google.com (Robert Konigsberg)
   5  */
   6 var Util = {};
   7
   8 /**
   9  * Get the y-labels for a given axis.
  10  *
  11  * You can specify a parent if more than one graph is in the document.
  12  */
  13 Util.getYLabels = function(axis_num, parent) {
  14   axis_num = axis_num || "";
  15   parent = parent || document;
  16   var y_labels = parent.getElementsByClassName("dygraph-axis-label-y" + axis_num);
  17   var ary = [];
  18   for (var i = 0; i < y_labels.length; i++) {
  19     ary.push(y_labels[i].innerHTML);
  20   }
  21   return ary;
  22 };
  23
  24 /**
  25  * Get the x-labels for a given axis.
  26  *
  27  * You can specify a parent if more than one graph is in the document.
  28  */
  29 Util.getXLabels = function(parent) {
  30   parent = parent || document;
  31   var x_labels = parent.getElementsByClassName("dygraph-axis-label-x");
  32   var ary = [];
  33   for (var i = 0; i < x_labels.length; i++) {
  34     ary.push(x_labels[i].innerHTML);
  35   }
  36   return ary;
  37 };
  38
  39 /**
  40  * Returns all text in tags w/ a given css class, sorted.
  41  * You can specify a parent if more than one graph is on the document.
  42  */
  43 Util.getClassTexts = function(css_class, parent) {
  44   parent = parent || document;
  45   var texts = [];
  46   var els = parent.getElementsByClassName(css_class);
  47   for (var i = 0; i < els.length; i++) {
  48     texts[i] = els[i].textContent;
  49   }
  50   texts.sort();
  51   return texts;
  52 };
  53
  54 Util.getLegend = function(parent) {
  55   parent = parent || document;
  56   var legend = parent.getElementsByClassName("dygraph-legend")[0];
  57   return legend.textContent;
  58 };
  59
  60 /**
  61  * Assert that all the elements in 'parent' with class 'className' is
  62  * the expected font size.
  63  */
  64 Util.assertFontSizes = function(parent, className, expectedSize) {
  65   var expectedSizePx = expectedSize + "px";
  66   var labels = parent.getElementsByClassName(className);
  67   assertTrue(labels.length > 0);
  68
  69   // window.getComputedStyle is apparently compatible with all browsers
  70   // (IE first became compatible with IE9.)
  71   // If this test fails on earlier browsers, then enable something like this,
  72   // because the font size is set by the parent div.
  73   // if (!window.getComputedStyle) {
  74   //   fontSize = label.parentElement.style.fontSize;
  75   // }
  76   for (var idx = 0; idx < labels.length; idx++) {
  77     var label = labels[idx];
  78     var fontSize = window.getComputedStyle(label).fontSize;
  79     assertEquals(expectedSizePx, fontSize);
  80   }
  81 };
  82
  83
  84 /**
  85  * Takes in an array of strings and returns an array of floats.
  86  */
  87 Util.makeNumbers = function(ary) {
  88   var ret = [];
  89   for (var i = 0; i < ary.length; i++) {
  90     ret.push(parseFloat(ary[i]));
  91   }
  92   return ret;
  93 };