質問編集履歴
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2017/04/10追記以降に現状とスクリプトを追記
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@@ -29,3 +29,243 @@
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グラフサイズ変更時の座標がずれてしまい
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Chart.js自体（Tooltip等）で処理しようと考えました。
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###2017/04/10追記
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＜以下記載のScript表示結果＞
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※Januaryにマウスオーバーしたとき
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＜解決できた点＞
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特定のBarのTooltipsを常時表示する
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＜問題点＞
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１．他のBarもマウスオーバーすると結局Tooltipsが表示されてしまう。
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２．Tooltipsに任意の文字列を表示することができない。
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（不要なMarchや判例の■マークが残ってしまう）
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３．Barのセンター上部に表示したいが右斜め上に表示されてしまう。
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（複数表示の際にTooltipsが重ならないようにするため）
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```JavaScript
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<div class="chart_container"><canvas id="myChart" width="320" height="180"></canvas></div>
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<script>
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var ctx = document.getElementById('myChart').getContext('2d');
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var data = {
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labels: ["January", "February", "March", "April", "May", "June", "July"],
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datasets: [
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{
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label: "My First dataset",
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backgroundColor: [
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'rgba(255, 99, 132, 0.2)',
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'rgba(54, 162, 235, 0.2)',
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'rgba(255, 206, 86, 0.2)',
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'rgba(75, 192, 192, 0.2)',
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'rgba(153, 102, 255, 0.2)',
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'rgba(255, 159, 64, 0.2)'
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],
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borderColor: [
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'rgba(255,99,132,1)',
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'rgba(54, 162, 235, 1)',
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'rgba(255, 206, 86, 1)',
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'rgba(75, 192, 192, 1)',
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'rgba(153, 102, 255, 1)',
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'rgba(255, 159, 64, 1)'
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],
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borderWidth: 1,
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data: [65, 59, 80, 81, 56, 55, 40],
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}
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]
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};
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var cnt;
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Chart.pluginService.register({
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beforeRender: function (chart) {
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if (chart.config.options.showAllTooltips) {
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// create an array of tooltips
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// we can't use the chart tooltip because there is only one tooltip per chart
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chart.pluginTooltips = [];
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chart.config.data.datasets.forEach(function (dataset, i) {
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chart.getDatasetMeta(i).data.forEach(function (sector, j) {
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chart.pluginTooltips.push(new Chart.Tooltip({
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_chart: chart.chart,
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_chartInstance: chart,
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_data: chart.data,
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_options: chart.options.tooltips,
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_active: [sector]
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}, chart));
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});
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});
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// turn off normal tooltips
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chart.options.tooltips.enabled = false;
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}
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},
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afterDraw: function (chart, easing) {
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if (chart.config.options.showAllTooltips) {
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// we don't want the permanent tooltips to animate, so don't do anything till the animation runs atleast once
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if (!chart.allTooltipsOnce) {
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if (easing !== 1)
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return;
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chart.allTooltipsOnce = true;
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}
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cnt = 1;
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// turn on tooltips
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chart.options.tooltips.enabled = true;
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Chart.helpers.each(chart.pluginTooltips, function (tooltip) {
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if (cnt == 3){ //例として3つ目のBarのみ表示するように設定
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tooltip.initialize();
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tooltip.update();
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// we don't actually need this since we are not animating tooltips
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tooltip.pivot();
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tooltip.transition(easing).draw();
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chart.options.tooltips.enabled = true;
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}
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cnt = cnt +1;
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});
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}
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}
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})
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var myChart = new Chart(ctx, {
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type: 'bar',
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data: data,
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options: {
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tooltips: {
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callbacks: {
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label: function(tooltipItems, data) {
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return 'AAA';
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}
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}
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},
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showAllTooltips: true,
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barPercentage:1, responsive: true,
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legend: { display: false },
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scales: {
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xAxes: [{ display: true, stacked: false, gridLines: { display: false } }],
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yAxes: [{ display: true,
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scaleLabel: { display: true, labelString: 'Y LABEL', fontFamily: 'monospace', fontSize: 14 },
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ticks: { max: 100, min: 0, stepSize: 20}
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}]
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}
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}
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});
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</script>
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```
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