如何在使用 Binding.scala 将元素加载到 dom 后执行一些 init

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

如何使用一些图表库初始化画布，例如chartjs什么时候加载到dom？

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单安装点，并将初始化代码放入重写中mount method:

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