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accessibility.js

accessibility.js 19 KB
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  1. /*
    2. 

  2.  Highcharts JS v5.0.6 (2016-12-07)
    3. 

  3.  Accessibility module
    4. 

  4. 

  5.  (c) 2010-2016 Highsoft AS
    6. 

  6.  Author: Oystein Moseng
    7. 

  7. 

  8.  License: www.highcharts.com/license
    9. 

  9. */
    10. 

  10. (function(h){"object"===typeof module&&module.exports?module.exports=h:h(Highcharts)})(function(h){(function(e){function h(a){for(var b=a.childNodes.length;b--;)a.appendChild(a.childNodes[b])}function q(a){var b;a&&a.onclick&&(b=l.createEvent("Events"),b.initEvent("click",!0,!1),a.onclick(b))}var y=e.win,l=y.document,g=e.each,A=e.erase,v=e.addEvent,B=e.removeEvent,w=e.fireEvent,C=e.dateFormat,u=e.merge,r={"default":["series","data point","data points"],line:["line","data point","data points"],spline:["line",
    11. 

  11. "data point","data points"],area:["line","data point","data points"],areaspline:["line","data point","data points"],pie:["pie","slice","slices"],column:["column series","column","columns"],bar:["bar series","bar","bars"],scatter:["scatter series","data point","data points"],boxplot:["boxplot series","box","boxes"],arearange:["arearange series","data point","data points"],areasplinerange:["areasplinerange series","data point","data points"],bubble:["bubble series","bubble","bubbles"],columnrange:["columnrange series",
    12. 

  12. "column","columns"],errorbar:["errorbar series","errorbar","errorbars"],funnel:["funnel","data point","data points"],pyramid:["pyramid","data point","data points"],waterfall:["waterfall series","column","columns"],map:["map","area","areas"],mapline:["line","data point","data points"],mappoint:["point series","data point","data points"],mapbubble:["bubble series","bubble","bubbles"]},D={boxplot:" Box plot charts are typically used to display groups of statistical data. Each data point in the chart can have up to 5 values: minimum, lower quartile, median, upper quartile and maximum. ",
    13. 

  13. arearange:" Arearange charts are line charts displaying a range between a lower and higher value for each point. ",areasplinerange:" These charts are line charts displaying a range between a lower and higher value for each point. ",bubble:" Bubble charts are scatter charts where each data point also has a size value. ",columnrange:" Columnrange charts are column charts displaying a range between a lower and higher value for each point. ",errorbar:" Errorbar series are used to display the variability of the data. ",
    14. 

  14. funnel:" Funnel charts are used to display reduction of data in stages. ",pyramid:" Pyramid charts consist of a single pyramid with item heights corresponding to each point value. ",waterfall:" A waterfall chart is a column chart where each column contributes towards a total end value. "},E="name id category x value y".split(" "),z="z open high q3 median q1 low close".split(" ");e.setOptions({accessibility:{enabled:!0,pointDescriptionThreshold:30,keyboardNavigation:{enabled:!0}}});e.wrap(e.Series.prototype,
    15. 

  15. "render",function(a){a.apply(this,Array.prototype.slice.call(arguments,1));this.chart.options.accessibility.enabled&&this.setA11yDescription()});e.Series.prototype.setA11yDescription=function(){var a=this.chart.options.accessibility,b=this.points&&this.points.length&&this.points[0].graphic&&this.points[0].graphic.element,d=b&&b.parentNode||this.graph&&this.graph.element||this.group&&this.group.element;d&&(d.lastChild===b&&h(d),this.points&&(this.points.length<a.pointDescriptionThreshold||!1===a.pointDescriptionThreshold)&&
    16. 

  16. g(this.points,function(c){c.graphic&&(c.graphic.element.setAttribute("role","img"),c.graphic.element.setAttribute("tabindex","-1"),c.graphic.element.setAttribute("aria-label",a.pointDescriptionFormatter&&a.pointDescriptionFormatter(c)||c.buildPointInfoString()))}),1<this.chart.series.length||a.describeSingleSeries)&&(d.setAttribute("role","region"),d.setAttribute("tabindex","-1"),d.setAttribute("aria-label",a.seriesDescriptionFormatter&&a.seriesDescriptionFormatter(this)||this.buildSeriesInfoString()))};
    17. 

  17. e.Series.prototype.buildSeriesInfoString=function(){var a=r[this.type]||r.default,b=this.description||this.options.description;return(this.name?this.name+", ":"")+(1===this.chart.types.length?a[0]:"series")+" "+(this.index+1)+" of "+this.chart.series.length+(1===this.chart.types.length?" with ":". "+a[0]+" with ")+(this.points.length+" "+(1===this.points.length?a[1]:a[2]))+(b?". "+b:"")+(1<this.chart.yAxis.length&&this.yAxis?". Y axis, "+this.yAxis.getDescription():"")+(1<this.chart.xAxis.length&&
    18. 

  18. this.xAxis?". X axis, "+this.xAxis.getDescription():"")};e.Point.prototype.buildPointInfoString=function(){var a=this,b=a.series,d=b.chart.options.accessibility,c="",f=!1,x=b.xAxis&&b.xAxis.isDatetimeAxis,b=x&&C(d.pointDateFormatter&&d.pointDateFormatter(a)||d.pointDateFormat||e.Tooltip.prototype.getXDateFormat(a,b.chart.options.tooltip,b.xAxis),a.x);g(z,function(c){void 0!==a[c]&&(f=!0)});f?(x&&(c=b),g(E.concat(z),function(b){void 0===a[b]||x&&"x"===b||(c+=(c?". ":"")+b+", "+this[b])})):c=(this.name||
    19. 

  19. b||this.category||this.id||"x, "+this.x)+", "+(void 0!==this.value?this.value:this.y);return this.index+1+". "+c+"."+(this.description?" "+this.description:"")};e.Axis.prototype.getDescription=function(){return this.userOptions&&this.userOptions.description||this.axisTitle&&this.axisTitle.textStr||this.options.id||this.categories&&"categories"||"values"};e.Axis.prototype.panStep=function(a,b){var d=b||3;b=this.getExtremes();var c=(b.max-b.min)/d*a,d=b.max+c,c=b.min+c,f=d-c;0>a&&c<b.dataMin?(c=b.dataMin,
    20. 

  20. d=c+f):0<a&&d>b.dataMax&&(d=b.dataMax,c=d-f);this.setExtremes(c,d)};e.wrap(e.Series.prototype,"init",function(a){a.apply(this,Array.prototype.slice.call(arguments,1));var b=this.chart;b.options.accessibility.enabled&&(b.types=b.types||[],0>b.types.indexOf(this.type)&&b.types.push(this.type),v(this,"remove",function(){var a=this,c=!1;g(b.series,function(f){f!==a&&0>b.types.indexOf(a.type)&&(c=!0)});c||A(b.types,a.type)}))});e.Chart.prototype.getTypeDescription=function(){var a=this.types&&this.types[0],
    21. 

  21. b=this.series[0]&&this.series[0].mapTitle;if(a){if("map"===a)return b?"Map of "+b:"Map of unspecified region.";if(1<this.types.length)return"Combination chart.";if(-1<["spline","area","areaspline"].indexOf(a))return"Line chart."}else return"Empty chart.";return a+" chart."+(D[a]||"")};e.Chart.prototype.getAxesDescription=function(){var a=this.xAxis.length,b=this.yAxis.length,d={},c;if(a)if(d.xAxis="The chart has "+a+(1<a?" X axes":" X axis")+" displaying ",2>a)d.xAxis+=this.xAxis[0].getDescription()+
    22. 

  22. ".";else{for(c=0;c<a-1;++c)d.xAxis+=(c?", ":"")+this.xAxis[c].getDescription();d.xAxis+=" and "+this.xAxis[c].getDescription()+"."}if(b)if(d.yAxis="The chart has "+b+(1<b?" Y axes":" Y axis")+" displaying ",2>b)d.yAxis+=this.yAxis[0].getDescription()+".";else{for(c=0;c<b-1;++c)d.yAxis+=(c?", ":"")+this.yAxis[c].getDescription();d.yAxis+=" and "+this.yAxis[c].getDescription()+"."}return d};e.Chart.prototype.addAccessibleContextMenuAttribs=function(){var a=this.exportDivElements;a&&(g(a,function(b){"DIV"!==
    23. 

  23. b.tagName||b.children&&b.children.length||(b.setAttribute("role","menuitem"),b.setAttribute("tabindex",-1))}),a[0].parentNode.setAttribute("role","menu"),a[0].parentNode.setAttribute("aria-label","Chart export"))};e.Point.prototype.highlight=function(){var a=this.series.chart;this.graphic&&this.graphic.element.focus&&this.graphic.element.focus();this.isNull?a.tooltip.hide(0):(this.onMouseOver(),a.tooltip.refresh(a.tooltip.shared?[this]:this));a.highlightedPoint=this;return this};e.Chart.prototype.highlightAdjacentPoint=
    24. 

  24. function(a){var b=this.series,d=this.highlightedPoint,c=d&&d.index||0;if(!b[0]||!b[0].points)return!1;if(!d)return b[0].points[0].highlight();if(d.series.points[c]!==d)for(var f=0;f<d.series.points.length;++f)if(d.series.points[f]===d){c=f;break}b=b[d.series.index+(a?1:-1)];d=d.series.points[c+(a?1:-1)]||b&&b.points[a?0:b.points.length-1];return void 0===d?!1:d.isNull&&this.options.accessibility.keyboardNavigation&&this.options.accessibility.keyboardNavigation.skipNullPoints?(this.highlightedPoint=
    25. 

  25. d,this.highlightAdjacentPoint(a)):d.highlight()};e.Chart.prototype.showExportMenu=function(){this.exportSVGElements&&this.exportSVGElements[0]&&(this.exportSVGElements[0].element.onclick(),this.highlightExportItem(0))};e.Chart.prototype.highlightExportItem=function(a){var b=this.exportDivElements&&this.exportDivElements[a],d=this.exportDivElements&&this.exportDivElements[this.highlightedExportItem];if(b&&"DIV"===b.tagName&&(!b.children||!b.children.length)){b.focus&&b.focus();if(d&&d.onmouseout)d.onmouseout();
    26. 

  26. if(b.onmouseover)b.onmouseover();this.highlightedExportItem=a;return!0}};e.Chart.prototype.highlightRangeSelectorButton=function(a){var b=this.rangeSelector.buttons;b[this.highlightedRangeSelectorItemIx]&&b[this.highlightedRangeSelectorItemIx].setState(this.oldRangeSelectorItemState||0);this.highlightedRangeSelectorItemIx=a;return b[a]?(b[a].element.focus&&b[a].element.focus(),this.oldRangeSelectorItemState=b[a].state,b[a].setState(2),!0):!1};e.Chart.prototype.highlightLegendItem=function(a){var b=
    27. 

  27. this.legend.allItems;b[this.highlightedLegendItemIx]&&w(b[this.highlightedLegendItemIx].legendGroup.element,"mouseout");this.highlightedLegendItemIx=a;return b[a]?(b[a].legendGroup.element.focus&&b[a].legendGroup.element.focus(),w(b[a].legendGroup.element,"mouseover"),!0):!1};e.Chart.prototype.hideExportMenu=function(){var a=this.exportDivElements;if(a){g(a,function(b){w(b,"mouseleave")});if(a[this.highlightedExportItem]&&a[this.highlightedExportItem].onmouseout)a[this.highlightedExportItem].onmouseout();
    28. 

  28. this.highlightedExportItem=0;this.renderTo.focus()}};e.Chart.prototype.addKeyboardNavEvents=function(){function a(c){this.keyCodeMap=c.keyCodeMap;this.move=c.move;this.validate=c.validate;this.init=c.init;this.transformTabs=!1!==c.transformTabs}function b(b,d){return new a(u({keyCodeMap:b,move:function(b){c.keyboardNavigationModuleIndex+=b;var a=c.keyboardNavigationModules[c.keyboardNavigationModuleIndex];if(a){if(a.validate&&!a.validate())return this.move(b);if(a.init)return a.init(b),!0}c.keyboardNavigationModuleIndex=
    29. 

  29. 0;c.slipNextTab=!0;return!1}},d))}function d(b){b=b||y.event;var a=c.keyboardNavigationModules[c.keyboardNavigationModuleIndex];9===(b.which||b.keyCode)&&c.slipNextTab?c.slipNextTab=!1:(c.slipNextTab=!1,a&&a.run(b)&&b.preventDefault())}var c=this;a.prototype={run:function(c){var b=this,a=c.which||c.keyCode,f=!1,a=this.transformTabs&&9===a?c.shiftKey?37:39:a;g(this.keyCodeMap,function(d){-1<d[0].indexOf(a)&&(f=!1===d[1].call(b,a,c)?!1:!0)});return f}};c.keyboardNavigationModules=[b([[[37,39],function(b){if(!c.highlightAdjacentPoint(39===
    30. 

  30. b))return this.move(39===b?1:-1)}],[[38,40],function(b){var a;if(c.highlightedPoint)if((a=c.series[c.highlightedPoint.series.index+(38===b?-1:1)])&&a.points[0])a.points[0].highlight();else return this.move(40===b?1:-1)}],[[13,32],function(){c.highlightedPoint&&c.highlightedPoint.firePointEvent("click")}]],{init:function(b){var a=c.series&&c.series[c.series.length-1],a=a&&a.points&&a.points[a.points.length-1];0>b&&a&&a.highlight()}}),b([[[37,38],function(){for(var a=c.highlightedExportItem||0,b=!0,
    31. 

  31. d=c.series;a--;)if(c.highlightExportItem(a)){b=!1;break}if(b)return c.hideExportMenu(),d&&d.length&&(a=d[d.length-1],a.points.length&&a.points[a.points.length-1].highlight()),this.move(-1)}],[[39,40],function(){for(var a=!0,b=(c.highlightedExportItem||0)+1;b<c.exportDivElements.length;++b)if(c.highlightExportItem(b)){a=!1;break}if(a)return c.hideExportMenu(),this.move(1)}],[[13,32],function(){q(c.exportDivElements[c.highlightedExportItem])}]],{validate:function(){return c.exportChart&&!(c.options.exporting&&
    32. 

  32. !1===c.options.exporting.enabled)},init:function(a){c.highlightedPoint=null;c.showExportMenu();if(0>a&&c.exportDivElements)for(a=c.exportDivElements.length;-1<a&&!c.highlightExportItem(a);--a);}}),b([[[38,40,37,39],function(a){c[38===a||40===a?"yAxis":"xAxis"][0].panStep(39>a?-1:1)}],[[9],function(a,b){c.mapNavButtons[c.focusedMapNavButtonIx].setState(0);if(b.shiftKey&&!c.focusedMapNavButtonIx||!b.shiftKey&&c.focusedMapNavButtonIx)return c.mapZoom(),this.move(b.shiftKey?-1:1);c.focusedMapNavButtonIx+=
    33. 

  33. b.shiftKey?-1:1;a=c.mapNavButtons[c.focusedMapNavButtonIx];a.element.focus&&a.element.focus();a.setState(2)}],[[13,32],function(){q(c.mapNavButtons[c.focusedMapNavButtonIx].element)}]],{validate:function(){return c.mapZoom&&c.mapNavButtons&&2===c.mapNavButtons.length},transformTabs:!1,init:function(a){var b=c.mapNavButtons[0],d=c.mapNavButtons[1],b=0<a?b:d;g(c.mapNavButtons,function(a,c){a.element.setAttribute("tabindex",-1);a.element.setAttribute("role","button");a.element.setAttribute("aria-label",
    34. 

  34. "Zoom "+(c?"out":"")+"chart")});b.element.focus&&b.element.focus();b.setState(2);c.focusedMapNavButtonIx=0<a?0:1}}),b([[[37,39,38,40],function(a){a=37===a||38===a?-1:1;if(!c.highlightRangeSelectorButton(c.highlightedRangeSelectorItemIx+a))return this.move(a)}],[[13,32],function(){3!==c.oldRangeSelectorItemState&&q(c.rangeSelector.buttons[c.highlightedRangeSelectorItemIx].element)}]],{validate:function(){return c.rangeSelector&&c.rangeSelector.buttons&&c.rangeSelector.buttons.length},init:function(a){g(c.rangeSelector.buttons,
    35. 

  35. function(a){a.element.setAttribute("tabindex","-1");a.element.setAttribute("role","button");a.element.setAttribute("aria-label","Select range "+(a.text&&a.text.textStr))});c.highlightRangeSelectorButton(0<a?0:c.rangeSelector.buttons.length-1)}}),b([[[9,38,40],function(a,b){a=9===a&&b.shiftKey||38===a?-1:1;b=c.highlightedInputRangeIx+=a;if(1<b||0>b)return this.move(a);c.rangeSelector[b?"maxInput":"minInput"].focus()}]],{validate:function(){return c.rangeSelector&&c.rangeSelector.inputGroup&&"hidden"!==
    36. 

  36. c.rangeSelector.inputGroup.element.getAttribute("visibility")&&!1!==c.options.rangeSelector.inputEnabled&&c.rangeSelector.minInput&&c.rangeSelector.maxInput},transformTabs:!1,init:function(a){c.highlightedInputRangeIx=0<a?0:1;c.rangeSelector[c.highlightedInputRangeIx?"maxInput":"minInput"].focus()}}),b([[[37,39,38,40],function(a){a=37===a||38===a?-1:1;if(!c.highlightLegendItem(c.highlightedLegendItemIx+a))return this.move(a)}],[[13,32],function(){q(c.legend.allItems[c.highlightedLegendItemIx].legendItem.element.parentNode)}]],
    37. 

  37. {validate:function(){return c.legend&&c.legend.allItems&&!c.colorAxis},init:function(a){g(c.legend.allItems,function(a){a.legendGroup.element.setAttribute("tabindex","-1");a.legendGroup.element.setAttribute("role","button");a.legendGroup.element.setAttribute("aria-label","Toggle visibility of series "+a.name)});c.highlightLegendItem(0<a?0:c.legend.allItems.length-1)}})];c.keyboardNavigationModuleIndex=0;c.renderTo.tabIndex||c.renderTo.setAttribute("tabindex","0");v(c.renderTo,"keydown",d);v(c,"destroy",
    38. 

  38. function(){B(c.renderTo,"keydown",d)})};e.Chart.prototype.addScreenReaderRegion=function(a){var b=this,d=b.series,c=b.options,e=c.accessibility,g=b.screenReaderRegion=l.createElement("div"),h=l.createElement("h3"),n=l.createElement("a"),p=l.createElement("h3"),t={position:"absolute",left:"-9999px",top:"auto",width:"1px",height:"1px",overflow:"hidden"},k=b.types||[],k=(1===k.length&&"pie"===k[0]||"map"===k[0])&&{}||b.getAxesDescription(),m=d[0]&&r[d[0].type]||r.default;g.setAttribute("role","region");
    39. 

  39. g.setAttribute("aria-label","Chart screen reader information.");g.innerHTML=e.screenReaderSectionFormatter&&e.screenReaderSectionFormatter(b)||'\x3cdiv tabindex\x3d"0"\x3eUse regions/landmarks to skip ahead to chart'+(1<d.length?" and navigate between data series":"")+".\x3c/div\x3e\x3ch3\x3eSummary.\x3c/h3\x3e\x3cdiv\x3e"+(c.title.text||"Chart")+(c.subtitle&&c.subtitle.text?". "+c.subtitle.text:"")+"\x3c/div\x3e\x3ch3\x3eLong description.\x3c/h3\x3e\x3cdiv\x3e"+(c.chart.description||"No description available.")+
    40. 

  40. "\x3c/div\x3e\x3ch3\x3eStructure.\x3c/h3\x3e\x3cdiv\x3eChart type: "+(c.chart.typeDescription||b.getTypeDescription())+"\x3c/div\x3e"+(1===d.length?"\x3cdiv\x3e"+m[0]+" with "+d[0].points.length+" "+(1===d[0].points.length?m[1]:m[2])+".\x3c/div\x3e":"")+(k.xAxis?"\x3cdiv\x3e"+k.xAxis+"\x3c/div\x3e":"")+(k.yAxis?"\x3cdiv\x3e"+k.yAxis+"\x3c/div\x3e":"");b.getCSV&&(n.innerHTML="View as data table.",n.href="#"+a,n.setAttribute("tabindex","-1"),n.onclick=e.onTableAnchorClick||function(){b.viewData();l.getElementById(a).focus()},
    41. 

  41. h.appendChild(n),g.appendChild(h));p.innerHTML="Chart graphic.";b.renderTo.insertBefore(p,b.renderTo.firstChild);b.renderTo.insertBefore(g,b.renderTo.firstChild);u(!0,p.style,t);u(!0,g.style,t)};e.Chart.prototype.callbacks.push(function(a){var b=a.options,d=b.accessibility;if(d.enabled){var c=l.createElementNS("http://www.w3.org/2000/svg","title"),f=l.createElementNS("http://www.w3.org/2000/svg","g"),h=a.container.getElementsByTagName("desc")[0],q=a.container.getElementsByTagName("text"),n="highcharts-title-"+
    42. 

  42. a.index,p="highcharts-data-table-"+a.index,t=b.title.text||"Chart",k=b.exporting&&b.exporting.csv&&b.exporting.csv.columnHeaderFormatter,m=[];c.textContent=t;c.id=n;h.parentNode.insertBefore(c,h);a.renderTo.setAttribute("role","region");a.renderTo.setAttribute("aria-label",t+". Use up and down arrows to navigate.");if(a.exportSVGElements&&a.exportSVGElements[0]&&a.exportSVGElements[0].element){var r=a.exportSVGElements[0].element.onclick,c=a.exportSVGElements[0].element.parentNode;a.exportSVGElements[0].element.onclick=
    43. 

  43. function(){r.apply(this,Array.prototype.slice.call(arguments));a.addAccessibleContextMenuAttribs();a.highlightExportItem(0)};a.exportSVGElements[0].element.setAttribute("role","button");a.exportSVGElements[0].element.setAttribute("aria-label","View export menu");f.appendChild(a.exportSVGElements[0].element);f.setAttribute("role","region");f.setAttribute("aria-label","Chart export menu");c.appendChild(f)}a.rangeSelector&&g(["minInput","maxInput"],function(b,c){a.rangeSelector[b]&&(a.rangeSelector[b].setAttribute("tabindex",
    44. 

  44. "-1"),a.rangeSelector[b].setAttribute("role","textbox"),a.rangeSelector[b].setAttribute("aria-label","Select "+(c?"end":"start")+" date."))});g(q,function(a){a.setAttribute("aria-hidden","true")});a.addScreenReaderRegion(p);d.keyboardNavigation&&a.addKeyboardNavEvents();u(!0,b.exporting,{csv:{columnHeaderFormatter:function(a,b,c){var d=m[m.length-1];1<c&&(d&&d.text)!==a.name&&m.push({text:a.name,span:c});return k?k.call(this,a,b,c):1<c?b:a.name}}});e.wrap(a,"getTable",function(a){return a.apply(this,
    45. 

  45. Array.prototype.slice.call(arguments,1)).replace("\x3ctable\x3e",'\x3ctable id\x3d"'+p+'" summary\x3d"Table representation of chart"\x3e\x3ccaption\x3e'+t+"\x3c/caption\x3e")});e.wrap(a,"viewData",function(a){if(!this.insertedTable){a.apply(this,Array.prototype.slice.call(arguments,1));var b=l.getElementById(p),c=b.getElementsByTagName("tbody")[0],d=c.firstChild.children,e="\x3ctr\x3e\x3ctd\x3e\x3c/td\x3e",f,h;b.setAttribute("tabindex","-1");g(c.children,function(a){f=a.firstChild;h=l.createElement("th");
    46. 

  46. h.setAttribute("scope","row");h.innerHTML=f.innerHTML;f.parentNode.replaceChild(h,f)});g(d,function(a){"TH"===a.tagName&&a.setAttribute("scope","col")});m.length&&(g(m,function(a){e+='\x3cth scope\x3d"col" colspan\x3d"'+a.span+'"\x3e'+a.text+"\x3c/th\x3e"}),c.insertAdjacentHTML("afterbegin",e))}})}})})(h)});
    47. 

  47.