ChartJs自定义工具提示位置

< html>< head>< title>带有自定义工具提示的折线图</title>< script src ="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.bundle.js"></script>< script>window.chartColors = {红色:'rgb(255，99，132)'，橙色:'rgb(255，159，64)'，黄色:"rgb(255，205，86)"，绿色:'rgb(75，192，192)'，蓝色:'rgb(54，162，235)'，紫色:'rgb(153，102，255)'，灰色:"rgb(231,233,237)"};window.randomScalingFactor = function(){return(Math.random()> 0.5?1.0:-1.0)* Math.round(Math.random()* 100);}</script>< style>帆布{-moz-user-select:无；-webkit-user-select:无；-ms-user-select:无；}#chartjs-tooltip {不透明度:1；位置:绝对；背景:rgba(0，0，0，.7);白颜色;border-radius:3px;-webkit-transition:所有.1缓解；过渡:所有.1缓解；指针事件:无；-webkit-transform:translate(-50％，0);转换:translate(-50％，0);}.chartjs-tooltip-key {显示:inline-block;宽度:10px；高度:10px；右边距:10px；}</style></head><身体>< canvas id ="chart"/>< script>Chart.defaults.global.pointHitDetectionRadius = 1;var customTooltips = function(tooltip){var tooltipEl = document.getElementById('chartjs-tooltip');如果(！tooltipEl){tooltipEl = document.createElement('div');tooltipEl.id ='chartjs-tooltip';tooltipEl.innerHTML =< div class ='wrapper'></div>"document.body.appendChild(tooltipEl);}//如果没有工具提示则隐藏如果(tooltip.opacity === 0){tooltipEl.style.opacity = 0;返回;}//设置插入符位置tooltipEl.classList.remove('above'，'below'，'no-transform');如果(tooltip.yAlign){tooltipEl.classList.add(tooltip.yAlign);} 别的 {tooltipEl.classList.add('no-transform');}函数getBody(bodyItem){返回bodyItem.lines;}//设定文字如果(tooltip.body){var titleLines = tooltip.title ||[];var bodyLines = tooltip.body.map(getBody);var innerHtml ='';titleLines.forEach(function(title){innerHtml + ='< span style ="margin-bottom:10px; display:inline-block;">'+标题+'</span>';});innerHtml + ='< div style ="display:flex; flex-direction:row;">';bodyLines.forEach(function(body，i){var parts = body [0] .split(':');innerHtml + ='< div style ="display:flex; flex-direction:column; margin-right:10px; font-size:12px;">';;innerHtml + ='< span>'+ parts [0] .trim()+'</span>';;innerHtml + ='< b>'+ parts [1] .trim()+'</b>';innerHtml + ='</div>';});innerHtml + ='</div>';var root = tooltipEl.querySelector('.wrapper');root.innerHTML = innerHtml;}var canvas = this._chart.canvas;tooltipEl.style.opacity = 1;tooltipEl.style.left = canvas.offsetLeft + tooltip.caretX +'px';tooltipEl.style.top = canvas.offsetTop + tooltip.caretY +'px';tooltipEl.style.fontFamily = tooltip._fontFamily;tooltipEl.style.fontSize = tooltip.fontSize;tooltipEl.style.fontStyle = tooltip._fontStyle;tooltipEl.style.padding ="10px";tooltipEl.style.border ="1px实心#B4B6C1";tooltipEl.style.backgroundColor ="#FFFFFF";tooltipEl.style.color =#4C4F59";tooltipEl.style.fontFamily ='"open sans"，"helvetica neue"，"arial"，"sans-serif"';};var lineChartData = {标签:[一月"，二月"，三月"，四月"，五月"，六月"，七月"]，数据集:[{标签:我的第一个数据集"，borderColor:window.chartColors.red，pointBackgroundColor:window.chartColors.red，填写:假，数据: [randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()]}，{标签:我的第二个数据集"，borderColor:window.chartColors.blue，pointBackgroundColor:window.chartColors.blue，填写:假，数据: [randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()，randomScalingFactor()]}]};window.onload = function(){var chartEl = document.getElementById("chart");window.myLine = new Chart(chartEl，{类型:行"，数据:lineChartData，选项: {标题:{显示:true，文字:"Chart.js折线图-自定义工具提示"}，工具提示:{已启用:false，模式:最近"，位置:平均"，相交:假，自定义:customTooltips}}});};</script></body></html> 解决方案可以通过向Chart.Tooltip.positioners映射中添加功能来定义新模式( DOC ).此函数返回工具提示的x和y位置.您可以添加一个自定义变量以将x调整为偏移量.一种方法是: //注册自定义定位器Chart.Tooltip.positioners.custom =函数(元素，位置){如果(！elements.length){返回false；}var offset = 0;//根据事件位置向左或向右调整偏移量if(elements [0] ._ chart.width/2> position.x){偏移量= 20;} 别的 {偏移量= -20;}返回 {x:position.x +偏移量，y:position.y}} 我创建的小提琴示例希望对您有帮助.there. I use ChartJS and customise tooltip, but have issue with position first and last tooltip's.Look:I suppose that in order to fix the problem, I need to use the https://www.chartjs.org/docs/latest/configuration/tooltip.html#position-modesbut, I cannot understand what the formula should be.CodePen example - https://codepen.io/anon/pen/JzRooy<html><head><title>Line Chart with Custom Tooltips</title><script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.bundle.js"></script><script>window.chartColors = {red: 'rgb(255, 99, 132)',orange: 'rgb(255, 159, 64)',yellow: 'rgb(255, 205, 86)',green: 'rgb(75, 192, 192)',blue: 'rgb(54, 162, 235)',purple: 'rgb(153, 102, 255)',grey: 'rgb(231,233,237)'};window.randomScalingFactor = function() {return (Math.random() > 0.5 ? 1.0 : -1.0) * Math.round(Math.random() * 100);}</script><style>canvas{-moz-user-select: none;-webkit-user-select: none;-ms-user-select: none;}#chartjs-tooltip {opacity: 1;position: absolute;background: rgba(0, 0, 0, .7);color: white;border-radius: 3px;-webkit-transition: all .1s ease;transition: all .1s ease;pointer-events: none;-webkit-transform: translate(-50%, 0);transform: translate(-50%, 0);}.chartjs-tooltip-key {display: inline-block;width: 10px;height: 10px;margin-right: 10px;}</style></head><body><canvas id="chart"/><script>Chart.defaults.global.pointHitDetectionRadius = 1;var customTooltips = function(tooltip) {var tooltipEl = document.getElementById('chartjs-tooltip');if (!tooltipEl) {tooltipEl = document.createElement('div');tooltipEl.id = 'chartjs-tooltip';tooltipEl.innerHTML = "<div class='wrapper'></div>"document.body.appendChild(tooltipEl);}// Hide if no tooltipif (tooltip.opacity === 0) {tooltipEl.style.opacity = 0;return;}// Set caret PositiontooltipEl.classList.remove('above', 'below', 'no-transform');if (tooltip.yAlign) {tooltipEl.classList.add(tooltip.yAlign);} else {tooltipEl.classList.add('no-transform');}function getBody(bodyItem) {return bodyItem.lines;}// Set Textif (tooltip.body) {var titleLines = tooltip.title || [];var bodyLines = tooltip.body.map(getBody);var innerHtml = '';titleLines.forEach(function(title) {innerHtml += '<span style="margin-bottom: 10px;display: inline-block;">' + title + '</span>';});innerHtml += '<div style="display: flex;flex-direction: row;">';bodyLines.forEach(function(body, i) {var parts = body[0].split(':');innerHtml += '<div style="display: flex;flex-direction: column;margin-right: 10px;font-size: 12px;">';innerHtml += '<span>' + parts[0].trim() + '</span>';innerHtml += '<b>' + parts[1].trim() + '</b>';innerHtml += '</div>';});innerHtml += '</div>';var root = tooltipEl.querySelector('.wrapper');root.innerHTML = innerHtml;}var canvas = this._chart.canvas;tooltipEl.style.opacity = 1;tooltipEl.style.left = canvas.offsetLeft + tooltip.caretX + 'px';tooltipEl.style.top = canvas.offsetTop + tooltip.caretY + 'px';tooltipEl.style.fontFamily = tooltip._fontFamily;tooltipEl.style.fontSize = tooltip.fontSize;tooltipEl.style.fontStyle = tooltip._fontStyle;tooltipEl.style.padding = "10px";tooltipEl.style.border = "1px solid #B4B6C1";tooltipEl.style.backgroundColor = "#FFFFFF";tooltipEl.style.color = "#4C4F59";tooltipEl.style.fontFamily = '"open sans", "helvetica neue", "arial", "sans-serif"';};var lineChartData = {labels: ["January", "February", "March", "April", "May", "June", "July"],datasets: [{label: "My First dataset",borderColor: window.chartColors.red,pointBackgroundColor: window.chartColors.red,fill: false,data: [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]}, {label: "My Second dataset",borderColor: window.chartColors.blue,pointBackgroundColor: window.chartColors.blue,fill: false,data: [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]}]};window.onload = function() {var chartEl = document.getElementById("chart");window.myLine = new Chart(chartEl, {type: 'line',data: lineChartData,options: {title:{display:true,text:'Chart.js Line Chart - Custom Tooltips'},tooltips: {enabled: false,mode: 'nearest',position: 'average',intersect: false,custom: customTooltips}}});};</script></body></html> 解决方案 New modes can be defined by adding functions to the Chart.Tooltip.positioners map (DOC). This function returns the x and y position for the tooltip.You can add a custom one to adjust the x at an offset.One way to do this would be to be: //register custome positionerChart.Tooltip.positioners.custom = function(elements, position) { if (!elements.length) { return false; } var offset = 0; //adjust the offset left or right depending on the event position if (elements[0]._chart.width / 2 > position.x) { offset = 20; } else { offset = -20; } return { x: position.x + offset, y: position.y } }Fiddle example that I createdI hope it helps. 这篇关于ChartJs自定义工具提示位置的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！