How to solve the problem that vue filter() does not take effect

In Vue, we can use filters to format and transform our data so that it can meet specific needs. However, sometimes we may encounter some problems, such as using Vue filter with the same value but it does not take effect. So, what should we do at this time?

In Vue, the use of filters is very flexible and convenient. We can create a global filter through the Vue.filter() method and apply it to any component. However, in some cases, the filter may not take effect when we use the same value.

For example, when we use a filter to format product prices into currency format, the filter may not work properly when multiple products have the same price. This is because in the computer, the same value is considered equal, and Vue will try to reduce the number of redraws and reflows as much as possible when rendering the DOM, resulting in the same value being calculated only once.

So, how to solve this problem? In fact, there are many ways to solve this problem, the following is one of them:

1. Use modifiers

Vue filters support the use of modifiers to solve this problem. We can add modifiers after the filter to ensure that every value is calculated. The way to use modifiers is as follows:

Vue.filter('currency', function (value) {
  return '$' + parseFloat(value).toFixed(2);
}, { deep: true });

In the above example, we used the { deep: true } modifier. This modifier tells Vue to deeply traverse the data object, ensuring that each value is calculated. This way, even if the same value appears in multiple places, Vue will calculate them multiple times, ensuring that the filter works properly.

2. Using computed properties

In addition to using modifiers, we can also use computed properties to solve this problem. We can define a computed property in the component to apply the filter to each value. This approach not only solves the problem of filters not taking effect, but also makes our code clearer and easier to maintain.

<template>
  <div>
    <ul>
      <li v-for="item in items" :key="item.id">
        {{ formattedPrice(item.price) }}
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [
        { id: 1, price: 10.00 },
        { id: 2, price: 10.00 },
        { id: 3, price: 10.00 },
      ],
    };
  },
  methods: {
    // 定义计算属性
    formattedPrice(price) {
      return '$' + parseFloat(price).toFixed(2);
    },
  },
};
</script>

As mentioned above, we define a computed property named formattedPrice in the component and apply the filter to each value. This way we ensure that every value is calculated and the filter works properly.

Summary

In Vue, the use of filters is very flexible and convenient. However, we may encounter some problems when dealing with the same values. By using modifiers or computed properties, we can solve the problem of filters not taking effect, making our code cleaner and easier to maintain.

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