Interacting with data entry on the webpage using Vue.js

Question

Interacting with data entry on the webpage using Vue.js

In a data input page, I encounter the need for various actions when specific data is entered. Currently, I handle data manipulation by sending back changes to the server and refreshing the screen. The application operates on an internal network for production management purposes, eliminating concerns about reloading time or file sizes for JavaScript libraries. Curious about exploring alternatives without reloading, I deliberated on using frameworks like Angular, React, and similar options. Most demonstrations display real-time updates as data is entered in one element, but this approach isn't particularly helpful here since only complete data inputs trigger updates. I considered implementing functionality where keystrokes trigger data acceptance on Enter, revert to initial state on Escape, and initiate different processes upon data acceptance. Vue.js caught my attention as an 'easy' to learn framework that could assist with this task. In the code snippet below, I attempt to create a component for a data entry block (consisting of a label and an input field) with the intention of passing parameters and updating when necessary. However, I face difficulties in implementation.

        <ms-pages></ms-pages>

The component definition reads:

  Vue.component('ms-pages', {
template: '<div class="form-group row">' +
            '<label class="col-xs-4 col-form-label">Pages</label>' +
            '<div class="col-xs-8">' +
              '<input v-model="mspages" class="form-control" type="text">' +
            '</div>' + 
           '</div>',
 })

Encountering errors with v-model despite defining "mspages" in the Vue instance, I attempted to also define it within the component. Additionally, I experimented with defining the component in the Vue instance, yet struggled with the syntax. Contemplating whether the component should store the current data state seems redundant given that the data resides in the input element, prompting me to reevaluate this approach.

While my proficiency in JavaScript is limited, I pondered creating custom functions to listen to keystrokes on elements, although this may lead to lengthy and intricate code (a task I find easier in Python). Any assistance on resolving these challenges would be highly valued.

javascript vue.js

Answer 1

Answer №1

Vue follows the MVVM architecture, where the view data reflects the model data. However, you don't need to manually update the data every time it changes because Vue handles synchronization automatically. Typically, a parent component passes a prop to a child component, which then emits an event when certain actions occur. For instance, you can create a component that updates values when the "enter" key is pressed:

Event Bus

var bus = new Vue(); // A Vue instance used for event emission

Component Template:

<template id="my-input">
  <div>
    <input v-model="inputVal" v-on:keyup.enter="updateVal"/>
  </div>
</template>

Component Definition:

Vue.component('my-input', {
  template: '#my-input',
  data(){
    return {
      inputVal: ""
    }
  },
  props: ['initialValue'],
  created(){
    this.inputVal = this.initialValue
  },
  methods: {
    updateVal(){
      bus.$emit('updateVal', this.inputVal);
    }
  }
});

Main App:

<div id="app">
  <my-input :initial-value="myInput"></my-input>
  {{ myInput }}
</div>

Parent Vue Instance:

new Vue({
  el: '#app',
  data: {
    myInput: "foo"
  },
  created(){
    bus.$on('updateVal', (updatedValue) => {
      this.myInput = updatedValue;
    });
  }
});

To explain further, we use a separate Vue instance called bus to emit and listen for events. When the "enter" key is pressed in the component, we emit an 'updateVal' event using

bus.$emit('updateVal', this.inputVal);

. The parent Vue instance listens for this event and updates its data accordingly.

The component template uses

v-on:keyup.enter="updateVal"

to call the updateVal method on key press, triggering the event emission. While v-model keeps the component's input synchronized, actual updates are made by firing events.

We also pass an initial value as a prop to the component.

Here's the JSFiddle link for reference: https://jsfiddle.net/k7cvq0f0/

Answer 2

Vue follows the MVVM architecture, where the view data reflects the model data. However, you don't need to manually update the data every time it changes because Vue handles synchronization automatically. Typically, a parent component passes a prop to a child component, which then emits an event when certain actions occur. For instance, you can create a component that updates values when the "enter" key is pressed:

Event Bus

var bus = new Vue(); // A Vue instance used for event emission

Component Template:

<template id="my-input">
  <div>
    <input v-model="inputVal" v-on:keyup.enter="updateVal"/>
  </div>
</template>

Component Definition:

Vue.component('my-input', {
  template: '#my-input',
  data(){
    return {
      inputVal: ""
    }
  },
  props: ['initialValue'],
  created(){
    this.inputVal = this.initialValue
  },
  methods: {
    updateVal(){
      bus.$emit('updateVal', this.inputVal);
    }
  }
});

Main App:

<div id="app">
  <my-input :initial-value="myInput"></my-input>
  {{ myInput }}
</div>

Parent Vue Instance:

new Vue({
  el: '#app',
  data: {
    myInput: "foo"
  },
  created(){
    bus.$on('updateVal', (updatedValue) => {
      this.myInput = updatedValue;
    });
  }
});

To explain further, we use a separate Vue instance called bus to emit and listen for events. When the "enter" key is pressed in the component, we emit an 'updateVal' event using

bus.$emit('updateVal', this.inputVal);

. The parent Vue instance listens for this event and updates its data accordingly.

The component template uses

v-on:keyup.enter="updateVal"

to call the updateVal method on key press, triggering the event emission. While v-model keeps the component's input synchronized, actual updates are made by firing events.

We also pass an initial value as a prop to the component.

Here's the JSFiddle link for reference: https://jsfiddle.net/k7cvq0f0/

Interacting with data entry on the webpage using Vue.js

Answer №1

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