How to execute some init after element loaded to dom with Binding.scala

Question

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

How can I init the canvas with some chart library like chartjs when it is loaded to dom ?

Answer 1

Solution 1

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

---

Solution 2

You can create a custom SingleMountPoint, and put the initialization code in the overriden 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