Adjust the Progress Bar according to the maximum input length

Currently, I am in the process of creating a form that requires one of the fields to have a maximum character limit. Additionally, I am looking to include a progress bar that visually indicates how close the user is to reaching this limit. For instance, if the character limit is set at 50, when the user inputs 25 characters, the progress bar should display 50% completion.

Although I have attempted to implement this functionality using the code below, I am uncertain on how to tie it to keypress events or enforce the maximum character count:

Here is an example image illustrating what I want to achieve:

https://i.sstatic.net/ICVxZ.png

Below is my Vue.js code snippet:

Vue.component('count-fieldtype', {
    mixins: [Fieldtype],
    template: `
        <div>
            <input type="text" class="form-control type-text mb-2" placeholder="" :maxlength="max" v-model="text" />
            <small class="help-block">You have: <strong><span v-text="(max - text.length)"></span></strong> characters left.</small>
            <progress max="100" :value="calculatePercentage(value)" id="progress"></progress>
        </div>
    `,
    methods: {
        calculatePercentage(value) {
            let contentLentg = handleKeyUp();
            return 50;
        }
    },
    data: function() {
        return {
            max: 50,
            text: ''
        };
    },
});

If anyone could offer guidance on achieving this feature, it would be greatly appreciated!

Answer №1

A recommended approach is to utilize computed properties for progress calculation, as explained in the Vue.js documentation here

new Vue({
  el: "#app",
  data() {
    return {
      text: '',
      max: 150
    }
  },
  computed: {
    progress() {
      return this.text.length / this.max * 100
    }
  }
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<div id="app">
  <div>
    <input type="text" class="form-control type-text mb-2" placeholder="" :maxlength="max" v-model="text" />
    <small class="help-block">You have: <strong><span v-text="(max - text.length)"></span></strong> characters left.</small>
    <progress max="100" :value="progress" id="progress"></progress>
  </div>
</div>

Answer №2

Utilizing a computed property based on the text length is an alternative approach to monitoring keypress events for updating a progress bar.

template: `
    <div>
        <input type="text" class="form-control type-text mb-2" placeholder="" :maxlength="max" v-model="text" />
        <small class="help-block">You have: <strong><span v-text="(max - text.length)"></span></strong> characters left.</small>
        <progress max="100" :value="progress" id="progress"></progress>
    </div>
`,
computed: {
    progress: function(){
      return Math.floor((this.text.length/this.max)*100)
    }
}

Answer №3

Below is a styled version that includes a computed property to calculate the progress bar value. Feel free to run the snippet in an expanded view.

new Vue({
  el: "#app",
  data: function() {
        return {
            max: 50,
            text: ''
        };
    },
 computed: {
   calculatePercentage() {
     let contentLength = this.text.length;
     return (contentLength / this.max) * 100;
   }
 }
})
body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}
.container {
  width: 30%;
}
progress, input  {
  width: 100%;
  box-sizing: border-box;
}

progress {
  height: 8px;
  background-color: white;
  appearance: none;
 
}

progress[value]::-webkit-progress-bar {
  background-color: lightgrey;
  border-radius: 2px;
}

progress[value]::-webkit-progress-value {
  background-color: orange;
  border-radius: 2px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div class="container">
  <div >
    <input type="text" class="form-control type-text mb-2" placeholder="" :maxlength="max" v-model="text" />
    
    
  </div>
  <progress max="100" :value="calculatePercentage" id="progress"></progress>
  <small class="help-block">You have: <strong><span v-text="(max - text.length)"></span></strong> characters left.</small>
  </div>
</div>

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