Method setValue

src/select-value-observer.js:18–45

(newValue)

  }

  setValue(newValue) {
    if (newValue !== null && newValue !== undefined && this.element.multiple && !Array.isArray(newValue)) {
      throw new Error('Only null or Array instances can be bound to a multi-select.');
    }
    if (this.value === newValue) {
      return;
    }
    // unsubscribe from old array.
    if (this.arrayObserver) {
      this.arrayObserver.unsubscribe(selectArrayContext, this);
      this.arrayObserver = null;
    }
    // subscribe to new array.
    if (Array.isArray(newValue)) {
      this.arrayObserver = this.observerLocator.getArrayObserver(newValue);
      this.arrayObserver.subscribe(selectArrayContext, this);
    }
    // assign and sync element.
    this.oldValue = this.value;
    this.value = newValue;
    this.synchronizeOptions();
    this.notify();
    // queue up an initial sync after the bindings have been evaluated.
    if (!this.initialSync) {
      this.initialSync = true;
      this.observerLocator.taskQueue.queueMicroTask(this);
    }
  }

  call(context, splices) {
    // called by task queue and array observer.