scala.js - 如何在使用 Binding.scala 将元素加载到 dom 后执行一些初始化

Question

@dom 
def chart(show: Var[Boolean]) = {
  if(show.bind) {
    <canvas id="chartCanvas"><canvas>
  }
}

如何使用一些图表库来初始化画布，例如chartjs加载到 dom 时？

Answer 1

解决方案 1

@dom 
def chart(show: Var[Boolean]) = {
  if(show.bind) {
    val myCanvas = <canvas id="chartCanvas"><canvas>
    myInitializationCode(myCanvas)
    myCanvas
  } else {
    <!-- don't show canvas -->
  }
}

---

解决方案 2

您可以创建一个自定义SingleMountPoint，并将初始化代码放在覆盖的mount方法中：

val yourCustomMountPoint = new SingleMountPoint[Boolean](show) {
  override def mount() = {
    super.mount()
    // Your custom initialization code
  }
  override def unmount() = {
    // Your custom clean up code
    super.unmount()
  }
  override def set(newValue: Boolean) = {
    // Your custom handler when `show` get changed
  }
}

// Inject your custom mount point into the rendering process
yourCustomMountPoint.bind