Solve the problem of isActive class failure when the Vue lottery roulette is rolling

This article discusses the problem that isActive class fails during the rolling process in the lottery roulette project developed by Vue, resulting in poor rolling effect of the roulette. The problem manifests as isActive class only takes effect at the beginning and end of the scrolling, and cannot be displayed normally during the scrolling process.

Problem analysis and solutions

The root cause of the problem lies in the update mechanism of isActive state in the roulette rolling logic ( roll method) conflicts with the asynchronous update mechanism of Vue responsive system. The following provide improvements:

1. Synchronous isActive status update: The original code uses this.$set to update isActive , but there may be an asynchronous update delay. It is recommended to combine Vue.nextTick to ensure that the DOM is updated before performing subsequent operations to ensure synchronization:

    roll() {
       // ...Other codes...
   
       this.initData.awardConfigList.forEach(item => this.$set(item, 'isActive', false));
       this.$set(this.initData.awardConfigList[this.indent], 'isActive', true);
   
       Vue.nextTick(() => {
           this.roll(); // Recursively call the roll method to implement animation});
   }

2. Optimize animation using requestAnimationFrame : The original code uses setTimeout to control scrolling, which may cause the animation to be unsmooth. It is recommended to use requestAnimationFrame instead, which can better synchronize with the browser rendering mechanism and achieve smoother animation effects:

    roll() {
       // ...Other codes...
   
       // Use requestAnimationFrame instead of setTimeout
       this.timers = requestAnimationFrame(() => this.roll());
   }

3. Add CSS transition effect: Make sure that the CSS style corresponding to isActive class contains transition effect, for example:

    .maskBox {
       transition: all 0.3s ease; /* or other transition attributes*/
   }

   This can make isActive state changes smoother and more natural.

An example of improved roll method (integrating the above suggestions):

 roll() {
    this.times = 1;
    this.indent = (this.times - 1) % 9;

    // ... (Other logic remains unchanged) ...

    this.initData.awardConfigList.forEach(item => this.$set(item, 'isActive', false));
    this.$set(this.initData.awardConfigList[this.indent], 'isActive', true);

    this.timers = requestAnimationFrame(() => this.roll());
}

Through the above improvements, the problem of isActive class failure during the scrolling process can be effectively solved, the user experience can be improved, and the lottery roulette scrolling is smoother and more natural. Remember to add the necessary transition effects to your CSS.

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