Vue

HTML

<div id="app">
  <button @click="runModal()">
  Click Me
  </button>
  <br><br>
  <div v-if="loadModal">
    <canvas id="myCanvas" width="200" height="100" style="border:3px solid #d3d3d3; color:red;">
    </canvas>
  </div>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data: {
    loadModal: false,
  },
  methods: {
  	async runModal() {
     	this.loadModal = true;
      await this.$nextTick();
      var c = document.getElementById("myCanvas");
      var ctx = c.getContext("2d");
      ctx.beginPath();
      ctx.arc(95, 50, 40, 0, 2 * Math.PI);
      ctx.stroke();
    }
  }
})