javascript - Why `@change` trigger don't work for v-data-picker? - Stack Overflow

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I use v-calendar package in my Vue.js application.

I want to send selected data range values to parent ponent. Why @change trigger don't work?

Parent.vue:

<template>
    <div>
        <Child @setRange="setRange" :range="range"/>
    </div>
</template>

<script>
data() {
    return {
        range: this.range,
    }
},
mounted() {
    firstCallToPage();
},
methods: {
    firstCallToPage(){
        axios.get('URL').then(response => {
            let self = this;
            this.range = {
                start: response.startDate,
                end: response.endDate,
            };
        }
    },
    setRange(range_value) {
        this.range = range_value;
    }
}
</script>

Child.vue:

<v-date-picker class='v-date-picker'
                       mode='range'
                       v-model='rangeValue'
                       :show-day-popover=false
                       :max-date='new Date()'
                       show-caps
                       :input-props='{placeholder: "", readonly: true}'
                       @change="sendRange">
</v-date-picker>
props: {
    range: {
        type: Object,
    },
},

data() {
  return {
    rangeValue: this.range
  }
},

sendRange: function () {
    this.$emit('setRange', this.rangeValue);
}

ERROR in console:

Avoid mutating a prop directly since the value will be overwritten whenever the parent ponent re-renders.
Instead, use a data or puted property based on the prop's value. Prop being mutated: "range"

I use v-calendar package in my Vue.js application.

I want to send selected data range values to parent ponent. Why @change trigger don't work?

Parent.vue:

<template>
    <div>
        <Child @setRange="setRange" :range="range"/>
    </div>
</template>

<script>
data() {
    return {
        range: this.range,
    }
},
mounted() {
    firstCallToPage();
},
methods: {
    firstCallToPage(){
        axios.get('URL').then(response => {
            let self = this;
            this.range = {
                start: response.startDate,
                end: response.endDate,
            };
        }
    },
    setRange(range_value) {
        this.range = range_value;
    }
}
</script>

Child.vue:

<v-date-picker class='v-date-picker'
                       mode='range'
                       v-model='rangeValue'
                       :show-day-popover=false
                       :max-date='new Date()'
                       show-caps
                       :input-props='{placeholder: "", readonly: true}'
                       @change="sendRange">
</v-date-picker>
props: {
    range: {
        type: Object,
    },
},

data() {
  return {
    rangeValue: this.range
  }
},

sendRange: function () {
    this.$emit('setRange', this.rangeValue);
}

ERROR in console:

Avoid mutating a prop directly since the value will be overwritten whenever the parent ponent re-renders.
Instead, use a data or puted property based on the prop's value. Prop being mutated: "range"

• javascript
• vue.js

Share Improve this question Follow edited Dec 24, 2018 at 12:24 Nurzhan Nogerbek asked Dec 24, 2018 at 8:04 Nurzhan NogerbekNurzhan Nogerbek 5,2462020 gold badges9898 silver badges201201 bronze badges 4

• 1 I'm diving into the docs and they seem to use @input instead of @change. Have you tried it? – Thomas Lombart Commented Dec 24, 2018 at 10:35
• Thank you for information. I successfully send date range values to parent panent when user select date in widget. In fact the problem was with mutation. It steal show me this message. Can you check my post again pls. I add error message which I see in console. How I can fix it? Do you have any ideas? – Nurzhan Nogerbek Commented Dec 24, 2018 at 11:20
• I provided you an answer. – Thomas Lombart Commented Dec 24, 2018 at 11:26
• @NurzhanNogerbek - Great! If it works for you and you are happy - then in general you would accept the answer. This will not only help other people with the same issue but it will also mean people are more likely to help you in the future with any other issues you have. You can read about accepting here: stackoverflow./help/accepted-answer – Amaarockz Commented Dec 4, 2020 at 15:33

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3 Answers 3

Sorted by: Reset to default 2

Try @input instead of @change. In v-datetime-picker works only with @input.

The error message is pretty explicit. The problem is that you give a prop to your child ponent (the one that contains v-date-picker) and you are overriding this prop with v-model (v-model is just syntactic sugar for :value and @change).

Derive your prop's value with a data value and use it for your operations:

<v-date-picker class='v-date-picker'
                       mode='range'
                       v-model='rangeValue'
                       :show-day-popover=false
                       :max-date='new Date()'
                       show-caps
                       :input-props='{placeholder: "", readonly: true}'
                       >
</v-date-picker>
props: {
    range: {
        type: Object,
    },
},

data() {
  return {
    rangeValue: this.range
  }
},

sendRange: function () {
    this.$emit('setRange', this.rangeValue);
}

Instead of using a method, you can make use of watch...

Consider you have the following attributes in the range Object

range: {
   start:value,
   end: value
}

<v-date-picker class='v-date-picker'
                       mode='range'
                       v-model='rangeValue'
                       :show-day-popover=false
                       :max-date='new Date()'
                       show-caps
                       :input-props='{placeholder: "", readonly: true}'
                       >
</v-date-picker>
props: {
    range: {
        type: Object,
    },
},
watch: {
  'rangeValue.start': function(newVal){
      this.$emit('setRange', newVal);
  }
},
data() {
  return {
    rangeValue: this.range
  }
}

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