Dynamic filter function application in Vue document

Vue is a web-based JavaScript framework used to build dynamic user interfaces on web pages. Vue has the advantages of being lightweight, convenient, and easy to learn, and is deeply loved by developers. In Vue, the dynamic filter function is a very useful function, which can help us process and filter data. This article will explore the application of dynamic filtering functions in Vue documents.

1. What is a dynamic filter function

In Vue, the dynamic filter function is a function used to process text. It can change the display mode of original data through filters. Normally, we can pass data to the filter through the pipe character "|" and then process it. For example:

{{ message | capitalize }}

In the above example, we use the filter named "capitalize" to convert the text The first letter is capitalized. So how is this filter defined? In fact, we can use Vue's filter function to define a dynamic filter function. For example:

filters: {
capitalize: function(value) {

if (!value) return '';
value = value.toString();
return value.charAt(0).toUpperCase() + value.slice(1);

}
}

In the above example, we defined a file called The "capitalize" filter function can convert the value parameter into a format with the first letter capitalized.

2. Usage scenarios of dynamic filtering functions

Dynamic filtering functions are widely used. For example, dynamic filtering functions can be used in data presentation, search filtering, date conversion, etc.

(1) Data presentation

In terms of data presentation, we can use dynamic filtering functions to format and display data, such as amounts, numbers, dates, etc. For example:

{{ amount | currency }}

In the above example, we use the filter function named "currency" to filter the amount Format the display and convert it into currency format.

(2) Search and filtering

In terms of search and filtering, we can use dynamic filtering functions to filter data under specified conditions. For example:

• {{ item }}

In the above example, we use the filter function named "filterBy" to filter the items array and only display items containing the search character The items of the string.

(3) Date conversion

In terms of date conversion, we can use the dynamic filter function to convert the date into the specified format. For example:

{{ date | formatDate }}

In the above example, we use the filter function named "formatDate" to convert date Convert the date to the specified format, such as "YYYY/MM/DD".

3. How to define the dynamic filter function

In Vue, we can define the dynamic filter function through global definition or definition within the component.

(1) Global definition

When defining the filter function globally, we need to define it before the Vue instance is initialized. For example:

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

In the above example, we use the Vue.filter() method for global definition and define a file named "capitalize" filter function.

(2) Definition within the component

When defining the filter function within the component, we need to define it in the "filters" option of the component. For example:

Vue.component('my-component', {
filters: {

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

},
template: '

{{ message | capitalize } }

',
data: function () {

return {
  message: 'hello world'
}

}
})

In the above example, we are in the "filters" option of the component A filter function called "capitalize" is defined. In the template, we use the filter function to process the data.

4. Summary

Dynamic filtering function is a very useful function in Vue, which can help us process and filter data. This article introduces the definition, usage scenarios and application methods of dynamic filtering functions, hoping to be helpful to developers.

The above is the detailed content of Dynamic filter function application in Vue document. For more information, please follow other related articles on the PHP Chinese website!