Highcharts

highchart legend 可拖拽扩展

文章目录
  1. 下面是扩展插件的代码
  2. 前端初始化代码
  3. 效果图

highchart 插件之legend 拖拽扩展

下面是扩展插件的代码

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(function (H) {
    var addEvent = H.addEvent;

    H.wrap(H.Chart.prototype, 'init', function (proceed) {
        proceed.apply(this, Array.prototype.slice.call(arguments, 1));

        var chart = this,
            legend = chart.legend,
            box = legend.box,
            options = legend.options,
            isDragging,
            downX,
            downY,
            optionsX,
            optionsY,
            currentX,
            currentY;
        if (options.draggable) {
            box.css({
                cursor: 'move'
            });
            addEvent(box.element, 'mousedown', function (e) {
                e = chart.pointer.normalize(e);
                downX = e.chartX;
                downY = e.chartY;
                optionsX = options.x;
                optionsY = options.y;
                currentX = legend.group.attr('translateX');
                currentY = legend.group.attr('translateY');
                isDragging = true;
            });
            addEvent(chart.container, 'mousemove', function (e) {
                if (isDragging) {
                    e = chart.pointer.normalize(e);
                    var draggedX = e.chartX - downX,
                        draggedY = e.chartY - downY;

                    options.x = optionsX + draggedX;
                    options.y = optionsY + draggedY;

                    // Do the move is we're inside the chart
                    if (currentX + draggedX > 0 && currentX + draggedX + legend.legendWidth < chart.chartWidth && currentY + draggedY > 0 && currentY + draggedY + legend.legendHeight < chart.chartHeight) {
                        legend.group.placed = false; // prevent animation
                        legend.group.align(H.extend({
                            width: legend.legendWidth,
                            height: legend.legendHeight
                        }, options), true, 'spacingBox');
                    }
                    if (chart.pointer.selectionMarker) {
                        chart.pointer.selectionMarker = chart.pointer.selectionMarker.destroy();
                    }

                }
            });
            addEvent(document, 'mouseup', function () {
                isDragging = false;
            });
        }
    });
}(Highcharts));

前端初始化代码

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$(function () {
    var chart = new Highcharts.Chart({
        chart: {
            renderTo: 'container',
            type: 'line'
        },
        title: {
            text: 'Highcharts Draggable Legend Demo'
        },
        xAxis: {
            categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
            labels: {
                zIndex: 6
            }
        },
        yAxis: {
            title: {
                text: 'Temperature (°C)'
            },
            plotLines: [{
                value: 0,
                width: 1,
                color: '#808080'
            }],
            labels: {
                zIndex: 6
            }
        },
        tooltip: {
            formatter: function () {
                return '<b>' + this.series.name + '</b><br/>' + this.x + ': ' + this.y + '°C';
            }
        },
        legend: {
            layout: 'vertical',
            backgroundColor: 'white',
            align: 'right',
            verticalAlign: 'top',
            y: 165,
            x: -220,
            borderWidth: 1,
            borderRadius: 5,

            floating: true,
            draggable: true,
            zIndex: 20
        },
        series: [{
            name: 'Tokyo',
            data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6]
        }, {
            name: 'New York',
            data: [-0.2, 0.8, 5.7, 11.3, 17.0, 22.0, 24.8, 24.1, 20.1, 14.1, 8.6, 2.5]
        }, {
            name: 'Berlin',
            data: [-0.9, 0.6, 3.5, 8.4, 13.5, 17.0, 18.6, 17.9, 14.3, 9.0, 3.9, 1.0]
        }, {
            name: 'London',
            data: [3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
        }]
    });
});

效果图

demo在线预览