How to solve the problem of Alibaba Cloud slider verification code error when switching page routing?

Solution to the Alibaba Cloud slider verification code error during page routing switching

When using Alibaba Cloud slider verification code, many developers encounter the problem of uncaught (in promise) typeerror: cannot read properties of null (reading 'addeventlistener') when routing switch (for example, this.router('/push') ). This article will analyze the causes and provide solutions.

The Alibaba Cloud slider verification code is usually initialized by the initAliyunCaptcha function, which receives configuration objects containing scene ID, prefix, pattern and other parameters. The reason for the error is that during route switching, the verification code element may have been removed or not initialized correctly, resulting in the object being empty when addeventlistener is called.

The key to the solution is to correctly manage verification code instances during routing switching:

1. Initialize when component mounts: Call initAliyunCaptcha in the mounted lifecycle hook of the Vue component to ensure that the verification code instance is correctly initialized when the page is loaded.

2. Destruction during component uninstallation: In the Vue component's beforeDestroy or destroyed lifecycle hook, destroy the previous verification code instance. This avoids accessing destroyed elements on subsequent route switching.

3. Reinitialize after route switching (if required): If the new route requires verification code, initAliyunCaptcha is called again in mounted hook of the new routing component.

Here is an improved code example that demonstrates how to use the Vue lifecycle hook to manage verification code instances:

<template>
  <div>
    <div id="captcha-element"></div>
    <button id="button">Submit</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      captcha: null
    };
  },
  mounted() {
    this.initCaptcha();
  },
  beforeDestroy() {
    this.destroyCaptcha();
  },
  methods: {
    initCaptcha() {
      if (this.captcha) {
        this.destroyCaptcha(); //先销毁之前的实例
      }
      initAliyunCaptcha({
        SceneId: 'c9h3****', //替换为您的SceneId
        prefix: '89****',   //替换为您的prefix
        mode: 'embed',
        element: '#captcha-element',
        button: '#button',
        captchaVerifyCallback: this.captchaVerifyCallback,
        onBizResultCallback: this.onBizResultCallback,
        getInstance: this.getInstance,
        slideStyle: { width: 360, height: 40 },
        language: 'cn',
        immediate: false,
        region: 'cn'
      });
    },
    destroyCaptcha() {
      if (this.captcha) {
        this.captcha.destroy();
        this.captcha = null;
      }
    },
    getInstance(instance) {
      this.captcha = instance;
    },
    async captchaVerifyCallback(captchaVerifyParam) {
      // ...您的验证码验证逻辑...
    },
    onBizResultCallback(bizResult) {
      // ...您的业务处理逻辑...
    }
  }
};
</script>

By correctly initializing and destroying the Alibaba Cloud slider verification code instance during the life cycle of the Vue component, we can effectively avoid cannot read properties of null (reading 'addeventlistener') error during routing switching, ensuring the stability of the application. Remember to replace the placeholder in your code with your actual parameters.

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