ChartJs 自定义工具提示位置 [英] ChartJs custom tooltip position
本文介绍了ChartJs 自定义工具提示位置的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
那里.我使用 ChartJS 并自定义工具提示，但是第一个和最后一个工具提示的位置存在问题.看:
我想为了解决这个问题，我需要使用 https://www.chartjs.org/docs/latest/configuration/tooltip.html#position-modes但是，我无法理解公式应该是什么.
CodePen 示例 - https://codepen.io/anon/pen/JzRooyp>
<html><头><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><脚本>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);}</脚本><风格>帆布{-moz 用户选择:无；-webkit 用户选择:无；-ms 用户选择:无；}#chartjs-工具提示 {不透明度:1；位置:绝对；背景:rgba(0, 0, 0, .7);白颜色;边框半径:3px；-webkit-transition:所有 .1s 轻松；过渡:所有 .1s 缓和；指针事件:无；-webkit-transform: 翻译(-50%, 0);变换:翻译(-50%，0)；}.chartjs-工具提示键 {显示:内联块；宽度:10px；高度:10px；右边距:10px；}</风格></头><身体><画布id="图表"/><脚本>Chart.defaults.global.pointHitDetectionRadius = 1;var customTooltips = 函数(工具提示){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);}//如果没有提示则隐藏if (tooltip.opacity === 0) {工具提示El.style.opacity = 0;返回;}//设置插入符号位置tooltipEl.classList.remove('above', 'below', 'no-transform');如果(工具提示.yAlign){tooltipEl.classList.add(tooltip.yAlign);} 别的 {tooltipEl.classList.add('无转换');}函数getBody(bodyItem){返回bodyItem.lines；}//设置文本如果(工具提示体){var titleLines = tooltip.title ||[];var bodyLines = tooltip.body.map(getBody);var innerHtml = '';titleLines.forEach(函数(标题){innerHtml += ' 解决方案
可以通过向 Chart.Tooltip.positioners 映射 (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的来调整偏移处的 x.一种方法是:
//注册客户定位器Chart.Tooltip.positioners.custom = 函数(元素，位置){如果(！元素.长度){返回假；}变量偏移量 = 0;//根据事件位置向左或向右调整偏移量如果(元素[0]._chart.width/2 > position.x){偏移量 = 20；} 别的 {偏移量 = -20；}返回 {x:位置.x + 偏移量，y:位置.y}}Fiddle 我创建的示例
希望对你有帮助.
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-modes but, 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 tooltip
if (tooltip.opacity === 0) {
tooltipEl.style.opacity = 0;
return;
}
// Set caret Position
tooltipEl.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 Text
if (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 positioner
Chart.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 created
I hope it helps.
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