Can vue filters recognize html tags?

The Vue framework is a very popular front-end development framework. In actual development, Vue filters are often used to process and format data. Among them, when some developers use Vue filters, for example, whether they can retain HTML tags when processing text, this is also a relatively common question. Today we will discuss this issue.

In Vue, we can use filters to format data. By using the pipe "|" and the name of the filter in the template, we can process the data. For example, we can use a filter named "capitalize" through the following syntax:

{{ message | capitalize }}

In code, we can define this filter:

Vue.filter('capitalize', function (value) {
  if (!value) return ''
  value = value.toString()
  return value.charAt(0).toUpperCase() + value.slice(1)
})

This filter You can convert the first character of the string to uppercase. We use it in the template to process the incoming characters. For example:

<p>{{ message | capitalize }}</p>

The function of this sentence is to convert the content in the message The first character is capitalized.

Next, let’s explore whether the filter can recognize HTML tags.

In Vue's official documentation, it is mentioned that filter processing is a pure JavaScript function, so the filter cannot perform some special processing, such as escaping HTML tags. Therefore, if we need to retain HTML tags when using filters, we need to use a third-party library to process them. For example, we can use [v-html](https://cn.vuejs.org/v2/ api/#v-html) directive.

Such as the following code:

<p v-html="message | capitalize"></p>

The function of this instruction is to pass the content in the message to the filter for processing, and finally render the processed results as HTML tags and insert them into p in the label.

In actual development, we need to choose different processing methods according to business needs.

To summarize:

The Vue filter is essentially a JavaScript function and cannot recognize HTML tags. If you need to retain HTML tags, you need to use a third-party library for processing, such as [v-html](https ://cn.vuejs.org/v2/api/#v-html) command.

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