Vue error: v-html cannot be used correctly to render dynamic HTML code. How to solve it?

Vue error: Unable to correctly use v-html to render dynamic HTML code, how to solve it?

Introduction:
In Vue development, we often need to dynamically render HTML code to display rich text content or dynamically generated user input. Vue provides the v-html directive to implement this function. However, sometimes we may encounter problems that cannot correctly render dynamic HTML code using v-html. This article will explore the causes of this problem and provide solutions.

Problem description:
In Vue, when we use the v-html directive to render dynamic HTML code, we may encounter the following error message:

[vue/valid-v-html] Unexpected control-character

This error message reminds us The dynamic HTML code contains illegal control characters, causing rendering failure.

Problem Analysis:
The reason for this error message is that Vue will HTML escape dynamic HTML codes by default to prevent cross-site scripting attacks (XSS). However, when we are sure that the dynamic HTML code is safe and need it to be rendered as is, we need to use the v-html directive. However, because Vue escapes HTML codes, HTML codes containing special characters (such as "<", ">", etc.) cannot be rendered correctly.

Solution:
The solution to this problem is very simple, we only need to manually parse and render the HTML code. Here is an example that shows how to correctly use v-html to render dynamic HTML code:

First, define a method in the Vue component to parse the HTML code and return a rendered result:

methods: {
  parseHTML(html) {
    const doc = new DOMParser().parseFromString(html, 'text/html');
    return doc.body.innerHTML;
  }
}

Then, call this method in the template to render the dynamic HTML code:

<template>
  <div v-html="parseHTML(dynamicHTML)"></div>
</template>

This can solve the problem of v-html not being able to correctly render the dynamic HTML code.

Sample code:
The following is a complete example showing how to use v-html to render dynamic HTML code:

<template>
  <div v-html="parseHTML(dynamicHTML)"></div>
</template>

<script>
export default {
  data() {
    return {
      dynamicHTML: '<p>这是一段动态渲染的HTML代码</p>'
    };
  },
  methods: {
    parseHTML(html) {
      const doc = new DOMParser().parseFromString(html, 'text/html');
      return doc.body.innerHTML;
    }
  }
};
</script>

Summary:
In Vue, if you encounter The problem of not being able to correctly use v-html to render dynamic HTML code can be solved by manually parsing the HTML code and rendering it. Just define a method to parse HTML code and call this method in the template. With this approach, we can ensure that dynamic HTML code is rendered correctly while ensuring security.

I hope this article will help you solve the problem of Vue error: unable to correctly use v-html to render dynamic HTML code!

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