我已经开始使用nvd3创建图表，需要获取'brushend'事件。 我找到了关于这个主题的以下信息：
以下代码适用于'brush'事件，但不适用于'brushend'
var chart = nv.models.lineWithFocusChart();
chart.brushExtent([50,70]);
chart.xAxis.tickFormat(d3.format(',f'));
chart.x2Axis.tickFormat(d3.format(',f'));
chart.yAxis.tickFormat(d3.format(',.2f'));
chart.y2Axis.tickFormat(d3.format(',.2f'));
chart.useInteractiveGuideline(true);
chart.dispatch.on('brush', function(brush){ console.log(brush); } );
d3.select("#chart svg").datum(tmp).call(chart);
答案 0 :(得分：1)
我通过在lineChart.js文件中添加一些行来解决问题：
nv.models.lineChart = function() {
"use strict";
var lines = nv.models.line()
, xAxis = nv.models.axis()
, yAxis = nv.models.axis()
, legend = nv.models.legend()
, interactiveLayer = nv.interactiveGuideline()
, tooltip = nv.models.tooltip()
, lines2 = nv.models.line()
, x2Axis = nv.models.axis()
, y2Axis = nv.models.axis()
, brush = d3.svg.brush()
;
var margin = {top: 30, right: 20, bottom: 50, left: 60}
, margin2 = {top: 0, right: 20, bottom: 20, left: 60}
, color = nv.utils.defaultColor()
, width = null
, height = null
, showLegend = true
, showXAxis = true
, showYAxis = true
, rightAlignYAxis = false
, useInteractiveGuideline = false
, x
, y
, x2
, y2
, focusEnable = false
, focusShowAxisY = false
, focusShowAxisX = true
, focusHeight = 50
, brushExtent = null
, state = nv.utils.state()
, defaultState = null
, noData = null
, dispatch = d3.dispatch('tooltipShow', 'tooltipHide', 'brush', 'stateChange', 'changeState', 'renderEnd', 'brushend')
, duration = 250
;
// set options on sub-objects for this chart
xAxis.orient('bottom').tickPadding(7);
yAxis.orient(rightAlignYAxis ? 'right' : 'left');
lines.clipEdge(true).duration(0);
lines2.interactive(false);
// We don't want any points emitted for the focus chart's scatter graph.
lines2.pointActive(function(d) { return false; });
x2Axis.orient('bottom').tickPadding(5);
y2Axis.orient(rightAlignYAxis ? 'right' : 'left');
tooltip.valueFormatter(function(d, i) {
return yAxis.tickFormat()(d, i);
}).headerFormatter(function(d, i) {
return xAxis.tickFormat()(d, i);
});
interactiveLayer.tooltip.valueFormatter(function(d, i) {
return yAxis.tickFormat()(d, i);
}).headerFormatter(function(d, i) {
return xAxis.tickFormat()(d, i);
});
//============================================================
// Private Variables
//------------------------------------------------------------
var renderWatch = nv.utils.renderWatch(dispatch, duration);
var stateGetter = function(data) {
return function(){
return {
active: data.map(function(d) { return !d.disabled; })
};
};
};
var stateSetter = function(data) {
return function(state) {
if (state.active !== undefined)
data.forEach(function(series,i) {
series.disabled = !state.active[i];
});
};
};
function chart(selection) {
renderWatch.reset();
renderWatch.models(lines);
renderWatch.models(lines2);
if (showXAxis) renderWatch.models(xAxis);
if (showYAxis) renderWatch.models(yAxis);
if (focusShowAxisX) renderWatch.models(x2Axis);
if (focusShowAxisY) renderWatch.models(y2Axis);
selection.each(function(data) {
var container = d3.select(this);
nv.utils.initSVG(container);
var availableWidth = nv.utils.availableWidth(width, container, margin),
availableHeight1 = nv.utils.availableHeight(height, container, margin) - (focusEnable ? focusHeight : 0),
availableHeight2 = focusHeight - margin2.top - margin2.bottom;
chart.update = function() {
if( duration === 0 ) {
container.call( chart );
} else {
container.transition().duration(duration).call(chart);
}
};
chart.container = this;
state
.setter(stateSetter(data), chart.update)
.getter(stateGetter(data))
.update();
// DEPRECATED set state.disableddisabled
state.disabled = data.map(function(d) { return !!d.disabled; });
if (!defaultState) {
var key;
defaultState = {};
for (key in state) {
if (state[key] instanceof Array)
defaultState[key] = state[key].slice(0);
else
defaultState[key] = state[key];
}
}
// Display noData message if there's nothing to show.
if (!data || !data.length || !data.filter(function(d) { return d.values.length; }).length) {
nv.utils.noData(chart, container);
return chart;
} else {
container.selectAll('.nv-noData').remove();
}
// Setup Scales
x = lines.xScale();
y = lines.yScale();
x2 = lines2.xScale();
y2 = lines2.yScale();
// Setup containers and skeleton of chart
var wrap = container.selectAll('g.nv-wrap.nv-lineChart').data([data]);
var gEnter = wrap.enter().append('g').attr('class', 'nvd3 nv-wrap nv-lineChart').append('g');
var g = wrap.select('g');
gEnter.append('g').attr('class', 'nv-legendWrap');
var focusEnter = gEnter.append('g').attr('class', 'nv-focus');
focusEnter.append('g').attr('class', 'nv-background').append('rect');
focusEnter.append('g').attr('class', 'nv-x nv-axis');
focusEnter.append('g').attr('class', 'nv-y nv-axis');
focusEnter.append('g').attr('class', 'nv-linesWrap');
focusEnter.append('g').attr('class', 'nv-interactive');
var contextEnter = gEnter.append('g').attr('class', 'nv-context');
contextEnter.append('g').attr('class', 'nv-background').append('rect');
contextEnter.append('g').attr('class', 'nv-x nv-axis');
contextEnter.append('g').attr('class', 'nv-y nv-axis');
contextEnter.append('g').attr('class', 'nv-linesWrap');
contextEnter.append('g').attr('class', 'nv-brushBackground');
contextEnter.append('g').attr('class', 'nv-x nv-brush');
// Legend
if (showLegend) {
legend.width(availableWidth);
g.select('.nv-legendWrap')
.datum(data)
.call(legend);
if ( margin.top != legend.height()) {
margin.top = legend.height();
availableHeight1 = nv.utils.availableHeight(height, container, margin) - (focusEnable ? focusHeight : 0);
}
wrap.select('.nv-legendWrap')
.attr('transform', 'translate(0,' + (-margin.top) +')');
}
wrap.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
if (rightAlignYAxis) {
g.select(".nv-y.nv-axis")
.attr("transform", "translate(" + availableWidth + ",0)");
}
//Set up interactive layer
if (useInteractiveGuideline) {
interactiveLayer
.width(availableWidth)
.height(availableHeight1)
.margin({left:margin.left, top:margin.top})
.svgContainer(container)
.xScale(x);
wrap.select(".nv-interactive").call(interactiveLayer);
}
g.select('.nv-focus .nv-background rect')
.attr('width', availableWidth)
.attr('height', availableHeight1);
lines
.width(availableWidth)
.height(availableHeight1)
.color(data.map(function(d,i) {
return d.color || color(d, i);
}).filter(function(d,i) { return !data[i].disabled; }));
var linesWrap = g.select('.nv-linesWrap')
.datum(data.filter(function(d) { return !d.disabled; }));
// Setup Main (Focus) Axes
if (showXAxis) {
xAxis
.scale(x)
._ticks(nv.utils.calcTicksX(availableWidth/100, data) )
.tickSize(-availableHeight1, 0);
}
if (showYAxis) {
yAxis
.scale(y)
._ticks( nv.utils.calcTicksY(availableHeight1/36, data) )
.tickSize( -availableWidth, 0);
}
//============================================================
// Update Axes
//============================================================
function updateXAxis() {
if(showXAxis) {
g.select('.nv-focus .nv-x.nv-axis')
.transition()
.duration(duration)
.call(xAxis)
;
}
}
function updateYAxis() {
if(showYAxis) {
g.select('.nv-focus .nv-y.nv-axis')
.transition()
.duration(duration)
.call(yAxis)
;
}
}
g.select('.nv-focus .nv-x.nv-axis')
.attr('transform', 'translate(0,' + availableHeight1 + ')');
if( !focusEnable )
{
linesWrap.call(lines);
updateXAxis();
updateYAxis();
}
else
{
lines2
.defined(lines.defined())
.width(availableWidth)
.height(availableHeight2)
.color(data.map(function(d,i) {
return d.color || color(d, i);
}).filter(function(d,i) { return !data[i].disabled; }));
g.select('.nv-context')
.attr('transform', 'translate(0,' + ( availableHeight1 + margin.bottom + margin2.top) + ')')
.style('display', focusEnable ? 'initial' : 'none')
;
var contextLinesWrap = g.select('.nv-context .nv-linesWrap')
.datum(data.filter(function(d) { return !d.disabled; }))
;
d3.transition(contextLinesWrap).call(lines2);
// Setup Brush
brush
.x(x2)
.on('brush', function() {
onBrush();
})
.on('brushend', function() {
dispatch.brushend({brush: brush});
});
if (brushExtent) brush.extent(brushExtent);
var brushBG = g.select('.nv-brushBackground').selectAll('g')
.data([brushExtent || brush.extent()]);
var brushBGenter = brushBG.enter()
.append('g');
brushBGenter.append('rect')
.attr('class', 'left')
.attr('x', 0)
.attr('y', 0)
.attr('height', availableHeight2);
brushBGenter.append('rect')
.attr('class', 'right')
.attr('x', 0)
.attr('y', 0)
.attr('height', availableHeight2);
var gBrush = g.select('.nv-x.nv-brush')
.call(brush);
gBrush.selectAll('rect')
.attr('height', availableHeight2);
gBrush.selectAll('.resize').append('path').attr('d', resizePath);
onBrush();
g.select('.nv-context .nv-background rect')
.attr('width', availableWidth)
.attr('height', availableHeight2);
// Setup Secondary (Context) Axes
if (focusShowAxisX) {
x2Axis
.scale(x2)
._ticks( nv.utils.calcTicksX(availableWidth/100, data) )
.tickSize(-availableHeight2, 0);
g.select('.nv-context .nv-x.nv-axis')
.attr('transform', 'translate(0,' + y2.range()[0] + ')');
d3.transition(g.select('.nv-context .nv-x.nv-axis'))
.call(x2Axis);
}
if (focusShowAxisY) {
y2Axis
.scale(y2)
._ticks( nv.utils.calcTicksY(availableHeight2/36, data) )
.tickSize( -availableWidth, 0);
d3.transition(g.select('.nv-context .nv-y.nv-axis'))
.call(y2Axis);
}
g.select('.nv-context .nv-x.nv-axis')
.attr('transform', 'translate(0,' + y2.range()[0] + ')');
}
//============================================================
// Event Handling/Dispatching (in chart's scope)
//------------------------------------------------------------
legend.dispatch.on('stateChange', function(newState) {
for (var key in newState)
state[key] = newState[key];
dispatch.stateChange(state);
chart.update();
});
interactiveLayer.dispatch.on('elementMousemove', function(e) {
lines.clearHighlights();
var singlePoint, pointIndex, pointXLocation, allData = [];
data
.filter(function(series, i) {
series.seriesIndex = i;
return !series.disabled && !series.disableTooltip;
})
.forEach(function(series,i) {
var extent = focusEnable ? (brush.empty() ? x2.domain() : brush.extent()) : x.domain();
var currentValues = series.values.filter(function(d,i) {
return lines.x()(d,i) >= extent[0] && lines.x()(d,i) <= extent[1];
});
pointIndex = nv.interactiveBisect(currentValues, e.pointXValue, lines.x());
var point = currentValues[pointIndex];
var pointYValue = chart.y()(point, pointIndex);
if (pointYValue !== null) {
lines.highlightPoint(series.seriesIndex, pointIndex, true);
}
if (point === undefined) return;
if (singlePoint === undefined) singlePoint = point;
if (pointXLocation === undefined) pointXLocation = chart.xScale()(chart.x()(point,pointIndex));
allData.push({
key: series.key,
value: pointYValue,
color: color(series,series.seriesIndex),
data: point
});
});
//Highlight the tooltip entry based on which point the mouse is closest to.
if (allData.length > 2) {
var yValue = chart.yScale().invert(e.mouseY);
var domainExtent = Math.abs(chart.yScale().domain()[0] - chart.yScale().domain()[1]);
var threshold = 0.03 * domainExtent;
var indexToHighlight = nv.nearestValueIndex(allData.map(function(d){return d.value;}),yValue,threshold);
if (indexToHighlight !== null)
allData[indexToHighlight].highlight = true;
}
interactiveLayer.tooltip
.chartContainer(chart.container.parentNode)
.valueFormatter(function(d,i) {
return d === null ? "N/A" : yAxis.tickFormat()(d);
})
.data({
value: chart.x()( singlePoint,pointIndex ),
index: pointIndex,
series: allData
})();
interactiveLayer.renderGuideLine(pointXLocation);
});
interactiveLayer.dispatch.on('elementClick', function(e) {
var pointXLocation, allData = [];
data.filter(function(series, i) {
series.seriesIndex = i;
return !series.disabled;
}).forEach(function(series) {
var pointIndex = nv.interactiveBisect(series.values, e.pointXValue, chart.x());
var point = series.values[pointIndex];
if (typeof point === 'undefined') return;
if (typeof pointXLocation === 'undefined') pointXLocation = chart.xScale()(chart.x()(point,pointIndex));
var yPos = chart.yScale()(chart.y()(point,pointIndex));
allData.push({
point: point,
pointIndex: pointIndex,
pos: [pointXLocation, yPos],
seriesIndex: series.seriesIndex,
series: series
});
});
lines.dispatch.elementClick(allData);
});
interactiveLayer.dispatch.on("elementMouseout",function(e) {
lines.clearHighlights();
});
dispatch.on('changeState', function(e) {
if (typeof e.disabled !== 'undefined' && data.length === e.disabled.length) {
data.forEach(function(series,i) {
series.disabled = e.disabled[i];
});
state.disabled = e.disabled;
}
chart.update();
});
//============================================================
// Functions
//------------------------------------------------------------
// Taken from crossfilter (http://square.github.com/crossfilter/)
function resizePath(d) {
var e = +(d == 'e'),
x = e ? 1 : -1,
y = availableHeight2 / 3;
return 'M' + (0.5 * x) + ',' + y
+ 'A6,6 0 0 ' + e + ' ' + (6.5 * x) + ',' + (y + 6)
+ 'V' + (2 * y - 6)
+ 'A6,6 0 0 ' + e + ' ' + (0.5 * x) + ',' + (2 * y)
+ 'Z'
+ 'M' + (2.5 * x) + ',' + (y + 8)
+ 'V' + (2 * y - 8)
+ 'M' + (4.5 * x) + ',' + (y + 8)
+ 'V' + (2 * y - 8);
}
function updateBrushBG() {
if (!brush.empty()) brush.extent(brushExtent);
brushBG
.data([brush.empty() ? x2.domain() : brushExtent])
.each(function(d,i) {
var leftWidth = x2(d[0]) - x.range()[0],
rightWidth = availableWidth - x2(d[1]);
d3.select(this).select('.left')
.attr('width', leftWidth < 0 ? 0 : leftWidth);
d3.select(this).select('.right')
.attr('x', x2(d[1]))
.attr('width', rightWidth < 0 ? 0 : rightWidth);
});
}
function onBrush() {
brushExtent = brush.empty() ? null : brush.extent();
var extent = brush.empty() ? x2.domain() : brush.extent();
//The brush extent cannot be less than one. If it is, don't update the line chart.
if (Math.abs(extent[0] - extent[1]) <= 1) {
return;
}
dispatch.brush({extent: extent, brush: brush});
updateBrushBG();
// Update Main (Focus)
var focusLinesWrap = g.select('.nv-focus .nv-linesWrap')
.datum(
data
.filter(function(d) { return !d.disabled; })
.map(function(d,i) {
return {
key: d.key,
area: d.area,
classed: d.classed,
values: d.values.filter(function(d,i) {
return lines.x()(d,i) >= extent[0] && lines.x()(d,i) <= extent[1];
}),
disableTooltip: d.disableTooltip
};
})
);
focusLinesWrap.transition().duration(duration).call(lines);
// Update Main (Focus) Axes
updateXAxis();
updateYAxis();
}
});
renderWatch.renderEnd('lineChart immediate');
return chart;
}
//============================================================
// Event Handling/Dispatching (out of chart's scope)
//------------------------------------------------------------
lines.dispatch.on('elementMouseover.tooltip', function(evt) {
if(!evt.series.disableTooltip){
tooltip.data(evt).hidden(false);
}
});
lines.dispatch.on('elementMouseout.tooltip', function(evt) {
tooltip.hidden(true);
});
//============================================================
// Expose Public Variables
//------------------------------------------------------------
// expose chart's sub-components
chart.dispatch = dispatch;
chart.lines = lines;
chart.lines2 = lines2;
chart.legend = legend;
chart.xAxis = xAxis;
chart.x2Axis = x2Axis;
chart.yAxis = yAxis;
chart.y2Axis = y2Axis;
chart.interactiveLayer = interactiveLayer;
chart.tooltip = tooltip;
chart.dispatch = dispatch;
chart.options = nv.utils.optionsFunc.bind(chart);
chart._options = Object.create({}, {
// simple options, just get/set the necessary values
width: {get: function(){return width;}, set: function(_){width=_;}},
height: {get: function(){return height;}, set: function(_){height=_;}},
showLegend: {get: function(){return showLegend;}, set: function(_){showLegend=_;}},
showXAxis: {get: function(){return showXAxis;}, set: function(_){showXAxis=_;}},
showYAxis: {get: function(){return showYAxis;}, set: function(_){showYAxis=_;}},
focusEnable: {get: function(){return focusEnable;}, set: function(_){focusEnable=_;}},
focusHeight: {get: function(){return height2;}, set: function(_){focusHeight=_;}},
focusShowAxisX: {get: function(){return focusShowAxisX;}, set: function(_){focusShowAxisX=_;}},
focusShowAxisY: {get: function(){return focusShowAxisY;}, set: function(_){focusShowAxisY=_;}},
brushExtent: {get: function(){return brushExtent;}, set: function(_){brushExtent=_;}},
defaultState: {get: function(){return defaultState;}, set: function(_){defaultState=_;}},
noData: {get: function(){return noData;}, set: function(_){noData=_;}},
// options that require extra logic in the setter
margin: {get: function(){return margin;}, set: function(_){
margin.top = _.top !== undefined ? _.top : margin.top;
margin.right = _.right !== undefined ? _.right : margin.right;
margin.bottom = _.bottom !== undefined ? _.bottom : margin.bottom;
margin.left = _.left !== undefined ? _.left : margin.left;
}},
duration: {get: function(){return duration;}, set: function(_){
duration = _;
renderWatch.reset(duration);
lines.duration(duration);
xAxis.duration(duration);
x2Axis.duration(duration);
yAxis.duration(duration);
y2Axis.duration(duration);
}},
focusMargin: {get: function(){return margin2;}, set: function(_){
margin2.top = _.top !== undefined ? _.top : margin2.top;
margin2.right = _.right !== undefined ? _.right : margin2.right;
margin2.bottom = _.bottom !== undefined ? _.bottom : margin2.bottom;
margin2.left = _.left !== undefined ? _.left : margin2.left;
}},
color: {get: function(){return color;}, set: function(_){
color = nv.utils.getColor(_);
legend.color(color);
lines.color(color);
}},
interpolate: {get: function(){return lines.interpolate();}, set: function(_){
lines.interpolate(_);
lines2.interpolate(_);
}},
xTickFormat: {get: function(){return xAxis.tickFormat();}, set: function(_){
xAxis.tickFormat(_);
x2Axis.tickFormat(_);
}},
yTickFormat: {get: function(){return yAxis.tickFormat();}, set: function(_){
yAxis.tickFormat(_);
y2Axis.tickFormat(_);
}},
x: {get: function(){return lines.x();}, set: function(_){
lines.x(_);
lines2.x(_);
}},
y: {get: function(){return lines.y();}, set: function(_){
lines.y(_);
lines2.y(_);
}},
rightAlignYAxis: {get: function(){return rightAlignYAxis;}, set: function(_){
rightAlignYAxis = _;
yAxis.orient( rightAlignYAxis ? 'right' : 'left');
}},
useInteractiveGuideline: {get: function(){return useInteractiveGuideline;}, set: function(_){
useInteractiveGuideline = _;
if (useInteractiveGuideline) {
lines.interactive(false);
lines.useVoronoi(false);
}
}}
});
nv.utils.inheritOptions(chart, lines);
nv.utils.initOptions(chart);
return chart;
};
nv.models.lineWithFocusChart = function() {
return nv.models.lineChart()
.margin({ bottom: 30 })
.focusEnable( true );
};