ChartJs 鼠标悬停错误(显示以前的图表) [英] ChartJs mouse hover bug (showing previous charts)

问题描述

我认为我的问题是一个已知问题，每次我制作一个新图表并将鼠标悬停在画布上的某些点上时，旧图表一直在闪烁.这是其中一个线程我尝试修复它，但没有似乎工作.我尝试使用destroy、clear、if语句重新附加画布，应该清除它，但什么也没有.

I think my issue is a known one, everytime I make a new chart and hover my mouse over some points in the canvas, the old charts flash in and out all the time. Here's one of the threads I followed to try and fix it, but nothing seems to work. I tried re-appending the canvas, using destroy, clear, if statements which should clear it, but nothing.

这是我的代码:

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: chartjsDate,
        datasets: [{
            label: 'temp',
            data: chartjsTemp,
            backgroundColor: "rgba(240,240,240,0.5)"
        }]
    }
});

我尝试在该代码之前和之后添加 myChart.destroy();，甚至 if(myChart!=null){myChart.destroy();}，但是依然没有.任何有关如何修复它的帮助将不胜感激.我发现的所有其他线程都很旧，他们的解决方案不起作用.

I tried adding myChart.destroy(); before and after that code, even if(myChart!=null){myChart.destroy();}, but still nothing. Any help on how to fix it would be appreciated. All other threads I found are quite old and their solutions don't work.

我尝试了一些东西，但无济于事:

Some stuff I tried, to no avail:

var myChart;
if (myChart != undefined || myChart !=null) {
    myChart.destroy();
}

推荐答案

已解决！我在 javascript 代码上方添加了这个:

Solved! I added this above the javascript code:

var button = document.getElementById("submitButton");
submitButton.addEventListener("click", function(){
    myChart.destroy();
});

并将我的提交按钮更改为具有 idsubmitButton"，如下所示:

And changed my submit button to have the id "submitButton", like this:

<input type="submit" class="btn btn-danger" id="submitButton" value="Send" />

这样，每次您按下提交按钮时，它都会破坏之前的图表.奇怪的是，当我尝试使用 myChart.destroy(); 时出现错误.

This way, everytime you press the submit button, it destroys the previous chart. The weird thing is that when trying to use myChart.destroy(); I got errors.

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