How to trigger a vue method only once, not every time

Question

I\'m handling a rotate even on change:

Answer 1

If rotate start always at zero you can do:

export default {
    data: {
        rotate = 0
    },
    methods: {
        handleRotate(e) {
            if (this.rotate !== 0) {
                return;
            }
            this.rotate = this.rotate + this.getRotateAngle(e.clientX, e.clientY);
        }
    }
};