There are all sorts of things that can wrong, and I often just want to have something working so I can start tweaking it.. This blog is a tutorial on using the JS library chart.js. My project used library Chart.JS to display a Chart from data sets. The Cube.js server will generate new SQL code, execute it against the database, and send the result back to the client. In fact, the chart will glitch and for half a second show the previous dataset — the dataset that isn’t even available in the current component. chart.update( ).update(config) Triggers an update of the chart. data: {labels: ['Risk Level'], datasets: [{ /* dataset one */ }, { /* dataset two */ }, { /* dataset three */ }]} It seems the legend displays labels from the first dataset. As you can see, datasets is an array. You could add another dataset, place it first in the dataset array, set its weight: 0. The update() triggers an update of the chart. In my example, I have three datasets — all with the same label. We’ll let the user pick a date range and based on that, reload the chart. Chart.js Chart.js is a JavaScript open source library that allows you to draw different types of charts by using the HTML5 canvas element. The code grabs the canvas element from html using the ID myChart and store it in a variable ctx.. You can name the variable anything you want,ctx is just a convection most programmers like to use, and it’s what we will be using. In the next part of the series, you will learn about the radar and polar area charts in Chart.js. Hello, I have ChartJS bar graph and could use some help. Yes, you can provide multiple data sets using the datasets property, which is an array of containing groupings of values. In the data property, we’ll define datasets and their labels. However, this part throws an exception TypeError: dataset.metaData is undefined: I … Since it uses HTML5 canvas , you have to include a polyfill to support older browsers. Hi Guys, in this post I would share how to show values on top of bars in Chart.js. This is a list of 10 working graphs (bar chart, pie chart, line chart, etc.) Which isn’t good. Each data set contains a series of values in data that correspond to the labels. All of the different types of charts can be seen here . I'm trying to show values for each bar in the chart. I am quite new at Chart.js 2, so any help will be appreciated. Chart.js is a powerful data visualization library, but I know from experience that it can be tricky to just get started and get a graph to show up. In this tutorial, we have covered all the aspects of line charts and bar charts in Chart.js. Notice we’ve told Chart.js that this will be a bar type chart. But on that Chart, I don’t know the exact value of each bar. When the data is passed into dataset, I need the background color to be determined based on the value. Setting the type variable, we could change the line chart into a bar chart, or even a pie chart. See two slightly different examples below depending on your version of Chart.js. When a user picks a new set of dates, a new request will be sent to the Cube.js server. To find out, I have to mouse over the Chart. And finally, the client re-renders a chart with the new data. Now, let’s create a chart. This will update all scales, legends, and then re-render the chart. This can be safely called after updating the data object. As suggested in Display values in Pareto chart using Chart.js 2.0.2 and other users I'm using this solution. Previously, I have made a Chart in the form of a bar like a picture below. Use this dataset to control what will appear in the legend, and having weight: 0 will not display it with your other datasets in the graph itself. You can look at my component in the repo if you want to add in the buttons and method I have for toggling between datasets. You should now be able to create basic charts, modify their appearance, and plot multiple datasets on the same chart without any issues.