How to implement the hidden function of input box in vue

With the development of web applications, more business scenarios require users to input data, and the user input box is one of the necessary components to achieve this goal. However, in some cases, we need to hide the input box. Of course, this is not to hide the input box completely, but to hide part of the input box, such as the entered password, etc. It is very simple to hide the input box in Vue. This article will take you to understand the implementation details.

First of all, we need to understand what Vue is. Vue is a progressive framework for building user interfaces. Vue can be easily integrated with other libraries or existing projects, and it also provides a very simple API that allows users to easily complete various UI interactions.

Next, we need to understand several important concepts in Vue, namely Vue instances, components, props, events and calculated properties.

• Vue instance: It is a core concept of Vue and is an object created with new Vue. All properties and methods in the Vue instance can be accessed through the instance, and various behaviors of Vue can also be controlled through the life cycle methods of the Vue instance.
• Component: It is an independent module in Vue that can help us break down the code into smaller, easier-to-organize parts. Therefore, components are a very key concept in Vue.
• Props: is a property object of the Vue component, used to pass data to the component. Props is a one-way data flow, that is, the parent component can pass data to the child component, but the child component cannot directly modify the value in props.
• Events: Can be used to monitor and respond to DOM events. Vue provides some built-in event modifiers to handle different events.
• Computed properties: Used to calculate properties based on the values ​​of other variables. Computed properties are an important concept in Vue and are often used for property calculations and dynamic calculations within components.

After understanding these concepts, we can start to implement the function of hiding the input box. First, we need to create a new Vue instance and add a textInput component. This component will need a prop to control whether the input box is hidden. The following is the code of this component:

// textInput.vue
<template>
  <div>
    <input 
      type="text" 
      :value="inputValue"
      @input="handleInput"
      v-if="!hidden"
    />
    <input 
      type="password" 
      :value="inputValue"
      @input="handleInput"
      v-if="hidden"
    />
  </div>
</template>

<script>
  export default {
    name: 'textInput',
    props: {
      hidden: {
        type: Boolean,
        default: false
      }
    },
    data() {
      return {
        inputValue: ''
      }
    },
    methods: {
      handleInput(e) {
        this.inputValue = e.target.value
        this.$emit('input', e.target.value)
      }
    }
  }
</script>

In this component, we define two input boxes, one is a normal text input box and the other is a password input box. The only difference between them is their type Attributes. Both input boxes are bound to the inputValue variable, which is used to save the entered value. At the same time, they are also bound to the input event. When the user enters in the input box, we will update the value of the inputValue variable and trigger an input event.

In the component, we use the v-if directive to control whether the input box is hidden. If hidden is false, the normal text input box is displayed; if hidden is true, the password input box is displayed. Props are also used here to pass the hidden attribute to the component.

Next, we need to use this component in the Vue instance and control its hiding through our custom input variable. The following is the implementation code:

// App.vue
<template>
  <div>
    <textInput 
      v-model="input" 
      :hidden="hideInput"
    />
    <button @click="toggleHideness">
      {{ hideInput ? 'Show' : 'Hide' }} input
    </button>
  </div>
</template>

<script>
  import textInput from './components/textInput.vue'

  export default {
    name: 'app',
    data() {
      return {
        input: '',
        hideInput: false
      }
    },
    components: {
      textInput
    },
    methods: {
      toggleHideness() {
        this.hideInput = !this.hideInput
      }
    }
  }
</script>

In this Vue instance, we introduced the component written above and defined two variables: input and hideInput. Among them, the input variable is used to save the value in the input box, and the hideInput variable is used to control the hiding of the input box.

We render the component in the template and pass the hideInput variable as a parameter to control whether the input box is hidden. We also added a button to toggle the value of the hideInput variable to toggle whether to use a password in the input box.

Finally, we need to add a computed property on the Vue instance to control the text displayed on the button. The following is the specific code:

// App.vue
<template>
  <div>
    <textInput 
      v-model="input" 
      :hidden="hideInput"
    />
    <button @click="toggleHideness">
      {{ buttonText }}
    </button>
  </div>
</template>

<script>
  import textInput from './components/textInput.vue'

  export default {
    name: 'app',
    data() {
      return {
        input: '',
        hideInput: false
      }
    },
    components: {
      textInput
    },
    computed: {
      buttonText() {
        return this.hideInput ? 'Show' : 'Hide' + ' input'
      }
    },
    methods: {
      toggleHideness() {
        this.hideInput = !this.hideInput
      }
    }
  }
</script>

Here we add a calculated attribute buttonText to determine the text displayed on the button based on the value of hideInput. In this way, when hideInput is false, the button text is "Hide input", and when hideInput is true, the button text is "Show input".

With the above code, we can easily implement the function of hiding the input box through Vue. To sum up, to hide the input box in Vue, you need to define a component that contains two input boxes, pass the information about whether to hide it through props, and also add calculated properties to control the text displayed on the button of the hidden input box.

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