Se soluciona el problema de que existan varios RadialGauge en el mismo componente agregandoles un id único.

Se sube a version 1.0.10
Se sube a GitHub 1.0.10
Se sube a NPM 1.0.10

example/src/App.js

@@ -5,9 +5,13 @@ import { RadialGauge } from 'chartjs-2-react'
 export default class App extends Component {
   render () {
     return (
-      <div style={{maxWidth: '600px', marginTop: '25px'}}>
+      <div>
-        <h3 style={{textAlign: 'center'}}>RadialGauge Component:</h3>
+
-        <RadialGauge />
+        <div style={{maxWidth: '600px', marginTop: '25px'}}>
+          <h3 style={{textAlign: 'center'}}>RadialGauge Component:</h3>
+          <RadialGauge />
+        </div>
+
       </div>
     )
   }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "chartjs-2-react",
-  "version": "1.0.8",
+  "version": "1.0.10",
   "description": "Libreria de chart.js para React.js",
   "author": "aleleba",
   "license": "MIT",

src/RadialGauge.jsx

@@ -4,30 +4,38 @@ import Chart from 'chart.js';
 
 import 'chartjs-chart-radial-gauge/build/Chart.RadialGauge.umd.min.js';
 
+import ID from './Service/ID.js'
+
 class RadialGauge extends Component {
 
-  componentDidMount(){
+  constructor(props) { 
+    super(props)
 
-    var ctx = document.getElementById('chart').getContext('2d');
+    let porcentaje = Math.round(Math.random() * 100),
-    
+        porcentajeTexto = `${porcentaje} %`
-    /*var gradientStroke = ctx.createLinearGradient(500, 0, 100, 0);
+        
-    gradientStroke.addColorStop(0, "#2A969E");
+    let id = this.props.id ? this.props.id : ID()
-    gradientStroke.addColorStop(1, "#2A969E");*/
-    //gradientStroke.addColorStop(2, "#f49080");
 
-    var config
+    this.state = {
+      id,
+      chart: null,
+      porcentaje,
+      porcentajeTexto
+    }
 
-    var randomScalingFactor = function() {
+  }
-      return Math.round(Math.random() * 100);
-     };
 
-    config = {
+  componentDidMount() {
+
+    var ctx = document.getElementById(`${this.state.id}`).getContext('2d');
+
+      var config = {
         type: 'radialGauge',
         data: {
           labels: this.props.config ? (this.props.config.data ? (this.props.config.data.labels || ["Porcentaje"]) : ["Porcentaje"]) : ["Porcentaje"],
           datasets: [
            {
-            data: this.props.config ? ((this.props.config.data) ? (this.props.config.data.datasets !== undefined ? [this.props.config.data.datasets.data] : [randomScalingFactor()]) : [randomScalingFactor()]) : [randomScalingFactor()],
+            data: this.props.config ? ((this.props.config.data) ? (this.props.config.data.datasets !== undefined ? [this.props.config.data.datasets.data] : [this.state.porcentaje]) : [this.state.porcentaje]) : [this.state.porcentaje],
             backgroundColor: this.props.config ? ( this.props.config.data ? (((this.props.config.data.datasets !== undefined) && (this.props.config.data.datasets.backgroundColor)) ? this.props.config.data.datasets.backgroundColor : '#2A969E') : '#2A969E') : '#2A969E',
             borderWidth: this.props.config ? ( this.props.config.data ? (((this.props.config.data.datasets !== undefined) && (this.props.config.data.datasets.borderWidth)) ? this.props.config.data.datasets.borderWidth : 0) : 0) : 0,
             label: this.props.config ? ( this.props.config.data ? (((this.props.config.data.datasets !== undefined) && (this.props.config.data.datasets.label)) ? this.props.config.data.datasets.label : "Porcentaje") : "Porcentaje") : "Porcentaje"
@@ -87,15 +95,31 @@ class RadialGauge extends Component {
         }
       };
 
-
+    this.setState({
-    new Chart(ctx, config);
+      chart: new Chart(ctx, config)
-
+    })
+    
   }
 
   render() {
-    return (          
+
-      <canvas id="chart" />
+    if (this.state.chart !== null) {
-    )
+
+      this.props.config ? ((this.props.config.data) ? (this.props.config.data.datasets !== undefined ? (this.state.chart.data.datasets[0].data[0] = this.props.config.data.datasets.data) : [this.state.porcentaje]) : [this.state.porcentaje]) : [this.state.porcentaje]
+
+      //this.state.chart.data.datasets[0].data[0] = this.props.config.data.datasets.data)
+
+      this.props.config ? ((this.props.config.options) ? (this.props.config.options.centerArea !== undefined ? (this.state.chart.options.centerArea.text = this.props.config.options.centerArea.text) : null) : null) : null
+
+      //this.state.chart.options.centerArea.text = this.props.config.options.centerArea.text
+
+      this.state.chart.update();
+
+      return <canvas id={`${this.state.id}`} />
+
+    } else { 
+      return <canvas id={`${this.state.id}`} />
+    }
   }
 }
 

src/Service/ID.js

@@ -0,0 +1,25 @@
+// Generate unique IDs for use as pseudo-private/protected names.
+// Similar in concept to
+// <http://wiki.ecmascript.org/doku.php?id=strawman:names>.
+//
+// The goals of this function are twofold:
+// 
+// * Provide a way to generate a string guaranteed to be unique when compared
+//   to other strings generated by this function.
+// * Make the string complex enough that it is highly unlikely to be
+//   accidentally duplicated by hand (this is key if you're using `ID`
+//   as a private/protected name on an object).
+//
+// Use:
+//
+//     var privateName = ID();
+//     var o = { 'public': 'foo' };
+//     o[privateName] = 'bar';
+var ID = function () {
+  // Math.random should be unique because of its seeding algorithm.
+  // Convert it to base 36 (numbers + letters), and grab the first 9 characters
+  // after the decimal.
+  return '_' + Math.random().toString(36).substr(2, 9);
+};
+
+export default ID