How to set up vue global filter (tutorial)

Vue.js is an efficient, flexible and easy-to-learn front-end framework with responsive and componentized features. Vue.js also provides a very convenient way to process data, that is, Vue.js filters.

In Vue.js, filters can be used to transform data. Usually we have to format the data to meet the needs of the application, such as date formatting, currency formatting, etc.

In Vue.js, global filters can be registered for use in any part of the application. This article will introduce you how to create a global filter in Vue.js.

1. Create a global filter

In Vue.js, you can register a filter globally by calling Vue.filter(), which can be used in other Vue instances. This method has two parameters, the first parameter is the name of the filter, and the second parameter is a function that is used to process the values ​​that need to be filtered.

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

The above code creates a global filter named "capitalize" that capitalizes the first letter of the incoming string. The capitalize filter can be used on any Vue instance.

2. Use global filters

Filters can be used with {{ }} binding or in v-bind. The following code can shorten a string to a fixed-length string:

<p>{{ description | truncate }}</p>

truncate is the name of the filter, which receives a string and truncates it to the specified length. The code is as follows:

Vue.filter('truncate', function (text, length, suffix) {
    if (text.length > length) {
        return text.substring(0, length) + suffix;
    } else {
        return text;
    }
});

3. Global filter update

If you want to update the global filter, you need to call the Vue.filter() method again, but it should be noted that if a The filter has already been registered. If registered again, it will be ignored or the current value will be replaced.

In short, global filters are an important Vue.js development skill that can help you process data faster and more conveniently. It allows filters to be used in any component, improving code reusability and better organizing code.

I hope this article will be helpful to setting up Vue.js global filters.

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