How to dynamically mount vue component with props

问题

Scenario / context

I have an overview component which contains a table and an add button. The add button opens a modal component. When i fill in some text fields in the modal and click the save button, a callback (given as prop) is called so the parent component (the overview) is updated. The save button also triggers the model toggle function so the model closes.

So far works everything like expected but when i want to add a second entry, the modal is "pre-filled" with the data of the recently added item.

Its clear to me that this happens because the model component keeps mounted in the background (so its just hidden). I could solve this by "reset" the modals data when the toggle function is triggered but i think there should be a better way.

I have a similar issue when i want to fetch data in a modal. Currently i call the fetch function in the mounted hook of the modal. So in this case the fetch happens when the parent component mounts the modal. This does not make sense as it should only (and each time) fetch when the modal is opened.

I think the nicest way to solve this is to mount the modal component dynamically when i click the "add" (open modal) button but i can't find how i can achieve this. This also avoids that a lot of components are mounted in the background which are possibly not used.

Screenshot

Example code

Overview:

<template>
  <div>
    // mount of my modal component
    <example-modal
        :toggleConstant = modalToggleUuid
        :submitHandler = submitHandler />
    // The overview component HTML is here
    </div>
</template>

<script>
  export default {
    data() {
      return {
                modalToggleUuid: someUuid,
                someList: [],
            }
    },

    mounted() {

    },

    methods: {
          showModal: function() {
        EventBus.$emit(this.modalToggleUuid);
      },

            submitHandler: function(item) {
                this.someList.push(item);
            }
    }
  }
</script>

Modal:

<template>
  <div>
    <input v-model="item.type">
    <input v-model="item.name">
    <input v-model="item.location">
    </div>
</template>

<script>
  export default {
    data() {
      return {
                modalToggleUuid: someUuid,
                item: {},
            }
    },

    mounted() {
            // in some cases i fetch something here. The data should be fetched each time the modal is opened 
    },

    methods: {
          showModal: function() {
        EventBus.$emit(this.modalToggleUuid);
      },

            submitHandler: function(item) {
                this.someList.push(item);
            }
    }
  }
</script>

Question

What is the best practive to deal with the above described scenario?

Should i mount the modal component dynamically?
Do i mount the component correctly and should i reset the content all the time?

回答1:

You are on the right way and in order to achieve what you want, you can approach this issue with v-if solution like this - then mounted() hook will run every time when you toggle modal and it also will not be present in DOM when you are not using it.

<template>
  <div>
    // mount of my modal component
    <example-modal
      v-if="isShowModal"
      :toggleConstant="modalToggleUuid"
      :submitHandler="submitHandler"
    />
    // The overview component HTML is here
  </div>
</template>

<script>
export default {
  data() {
    return {
      isShowModal: false,
      modalToggleUuid: someUuid,
      someList: []
    };
  },

  mounted() {},

  methods: {
    showModal: function() {
      this.isShowModal = true;
    },

    submitHandler: function(item) {
      this.someList.push(item);
      this.isShowModal = false;
    }
  }
};
</script>

来源：https://stackoverflow.com/questions/60786987/how-to-dynamically-mount-vue-component-with-props

标签

Vue.js

vue-component