Exploring ways to utilize functions and operators with the output of custom VueJS filters?

Question

Exploring ways to utilize functions and operators with the output of custom VueJS filters?

I have implemented a Vue filter called timeconverter to alter the date format of a string. My goal is to verify if the outcome of {{ time | timeconverter }} is before the present time.

Is there a way to utilize JavaScript functions on the output generated by the filter?

For instance:

{{ time | timeconverter }}.length() 

OR:

{{ time | timeconverter }} > Date.now()

I aim to exhibit a div (shown below) based on whether {{ time | timeconverter }} is greater than the current time.

<div>
 {{ time | timeconverter }}<span>min</span>
</div>

javascript vue.js vuejs2

Answer 1

Answer №1

This scenario is not feasible and is not advisable. Only consider using comparisons in your string representation if absolutely necessary, although I still would advise against it. If you wish to implement something like this:

{{ time | timeconverter | afterNow}}

Firstly, let's understand what a filter is:

A filter's purpose is to receive the value of the expression (the result from the previous chain)

You may need to parse the result of timeconverter back into a date and then compare it with the current date. Keep in mind that this process is only suitable within a filter.

Instead, consider using a method or computed value.

Answer 2

This scenario is not feasible and is not advisable. Only consider using comparisons in your string representation if absolutely necessary, although I still would advise against it. If you wish to implement something like this:

{{ time | timeconverter | afterNow}}

Firstly, let's understand what a filter is:

A filter's purpose is to receive the value of the expression (the result from the previous chain)

You may need to parse the result of timeconverter back into a date and then compare it with the current date. Keep in mind that this process is only suitable within a filter.

Instead, consider using a method or computed value.

Answer 3

Answer №2

One way to directly invoke the filter is by using $options.filters.nameOfFilter:

<div v-if="$options.filters.timeconverter(time) > Date.now()">
  {{ time | timeconverter }}<span>min</span>
</div>

Vue.filter('timeconverter', value => moment(value).valueOf())

new Vue({
  el: '#app',
  data: () => ({
    time: '04 Dec 2025 00:12:00 GMT'
  }),
  mounted() {
    console.log('timeconverter', this.$options.filters.timeconverter(this.time))
  }
})

<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e3959686a3d1cdd5cdd2d3">[email protected]</a>/dist/vue.min.js"></script>
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="15787a78707b6155273b27213b25">[email protected]</a>/moment.js"></script>

<div id="app">
  <input v-model="time" placeholder="time">
  <div v-if="$options.filters.timeconverter(time) > Date.now()">
    {{ time | timeconverter }}<span>min</span>
  </div>
  <div v-else>Nothing to see</div>
</div>

Another approach is to use computed properties to prevent running the filter twice in both the v-if and the <div>:

<template>
  <div v-if="filteredTime > Date.now()">
    {{ filteredTime }}<span>min</span>
  </div>
</template>

<script>
export default {
  computed: {
    filteredTime() {
      return this.$options.filters.timeconverter(this.time)
    }
  }
}
</script>

Vue.filter('timeconverter', value => moment(value).valueOf())

new Vue({
  el: '#app',
  data: () => ({
    time: '04 Dec 2025 00:12:00 GMT'
  }),
  computed: {
    filteredTime() {
      return this.$options.filters.timeconverter(this.time)
    }
  }
})

<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="dea8abbb9eecf0e8f0efee">[email protected]</a>/dist/vue.min.js"></script>
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="aac7c5c7cfc4deea9884989e849a">[email protected]</a>/moment.js"></script>

<div id="app">
  <input v-model="time" placeholder="time">
  <div v-if="filteredTime > Date.now()">
    {{ filteredTime }}<span>min</span>
  </div>
  <div v-else>Nothing to see</div>
</div>

Answer 4

One way to directly invoke the filter is by using $options.filters.nameOfFilter:

<div v-if="$options.filters.timeconverter(time) > Date.now()">
  {{ time | timeconverter }}<span>min</span>
</div>

Vue.filter('timeconverter', value => moment(value).valueOf())

new Vue({
  el: '#app',
  data: () => ({
    time: '04 Dec 2025 00:12:00 GMT'
  }),
  mounted() {
    console.log('timeconverter', this.$options.filters.timeconverter(this.time))
  }
})

<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e3959686a3d1cdd5cdd2d3">[email protected]</a>/dist/vue.min.js"></script>
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="15787a78707b6155273b27213b25">[email protected]</a>/moment.js"></script>

<div id="app">
  <input v-model="time" placeholder="time">
  <div v-if="$options.filters.timeconverter(time) > Date.now()">
    {{ time | timeconverter }}<span>min</span>
  </div>
  <div v-else>Nothing to see</div>
</div>

Another approach is to use computed properties to prevent running the filter twice in both the v-if and the <div>:

<template>
  <div v-if="filteredTime > Date.now()">
    {{ filteredTime }}<span>min</span>
  </div>
</template>

<script>
export default {
  computed: {
    filteredTime() {
      return this.$options.filters.timeconverter(this.time)
    }
  }
}
</script>

Vue.filter('timeconverter', value => moment(value).valueOf())

new Vue({
  el: '#app',
  data: () => ({
    time: '04 Dec 2025 00:12:00 GMT'
  }),
  computed: {
    filteredTime() {
      return this.$options.filters.timeconverter(this.time)
    }
  }
})

<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="dea8abbb9eecf0e8f0efee">[email protected]</a>/dist/vue.min.js"></script>
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="aac7c5c7cfc4deea9884989e849a">[email protected]</a>/moment.js"></script>

<div id="app">
  <input v-model="time" placeholder="time">
  <div v-if="filteredTime > Date.now()">
    {{ filteredTime }}<span>min</span>
  </div>
  <div v-else>Nothing to see</div>
</div>

Exploring ways to utilize functions and operators with the output of custom VueJS filters?

Answer №1

Answer №2

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