Destroy chart.js bar graph to redraw other graph in same

Question

I am using the Chart.js library to draw a bar graph, it is working fine, but now I want to destroy the bar graph and make

Answer 1

I'm using Chart.js 2.7.2 as of right now. In my app, I'm creating multiple charts and needed a way to access them to properly "replace" their data and fix the "old chart" showing on hover. None of the answers I've tried worked right.

Here's a way to manage this with one or multiple charts:

Store charts in global

var charts=[]; // global

Function to create charts

function createChart(id, type, labels, data)
{
    // for multiple datasets
    var datasets=[];
    data.forEach(function(set) {
        datasets.push({
            label: set.label,
            data: set.data
        });
    });  

    var config = {
        type: type,
        data: {
            labels: labels,
            datasets: datasets
        }
    };

    if(typeof charts[id] == "undefined") // see if passed id exists
    {   
        // doesn't, so create it
        charts[id]= new (function(){
            this.ctx=$(id); // canvas el
            this.chart=new Chart(this.ctx, config);
        })();     
        console.log('created chart '+charts[id].chart.canvas.id);     
    }
    else
    {
        charts[id].chart.destroy(); // "destroy" the "old chart"
        charts[id].chart=new Chart(charts[id].ctx, config); // create the chart with same id and el
        console.log('replaced chart '+charts[id].chart.canvas.id);        
    }
    // just to see all instances
    Chart.helpers.each(Chart.instances, function(instance){
        console.log('found instance '+instance.chart.canvas.id)
    })

}

For each of your canvas elements like:

Use the function to create/replace the chart

createChart('#thiscanvasid', 'bar', json.labels, json.datasets);