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javascriptangulartypescriptangular7

draggable div should be avoid x and y overlap

I have a problem with draggable element which overlapping screen area. Here is example of code:

onDrag(pageX: number, pageY: number) {
    if (this.isDragging) {
      const deltaX = pageX - this.lastPageX;
      const deltaY = pageY - this.lastPageY;

      const coords = this.element.nativeElement.getBoundingClientRect();
      this.element.nativeElement.style.left = `${coords.left + deltaX}px`;
      this.element.nativeElement.style.top = `${coords.top + deltaY}px`;

      this.lastPageX = pageX;
      this.lastPageY = pageY;
   }
}

What i exactly want is when element reaches of screen it should be style left: 0; or etc.

enter image description here

Here is a stack. What am i doing wrong ?

Solution

  • You could add these lines to your onDrag function:

      if(coords.left + deltaX > 0 && coords.right + deltaX < window.innerWidth) {
    this.element.nativeElement.style.left = `${coords.left + deltaX}px`;
  }

  if (coords.top + deltaY > 0 && coords.bottom + deltaY < window.innerHeight) {
    this.element.nativeElement.style.top = `${coords.top + deltaY}px`;
  }