The problem text is not updated after vue 3 upgrade

Question

I'm trying to rewrite a component for vue 3, more specifically to use their new setup script so that the code looks cleaner, this is what it currently looks like.

export default {
    name: "typeWriter",
    data: () => {
        return {
            typeValue: "",
            typeStatus: false,
            displayTextArray: ['Art', 'Science', 'Math', 'Everything'],
            typingSpeed: 70,
            erasingSpeed: 70,
            newTextDelay: 1000,
            displayTextArrayIndex: 0,
            charIndex: 0,
        };
    },
    created() {
        setTimeout(this.typeText, this.newTextDelay + 200);
    },
    methods: {
        typeText() {
            if (this.charIndex < this.displayTextArray[this.displayTextArrayIndex].length) {
                if (!this.typeStatus) {
                    this.typeStatus = true;
                }

                this.typeValue += this.displayTextArray[this.displayTextArrayIndex].charAt(this.charIndex);
                this.charIndex++;

                setTimeout(this.typeText, this.typingSpeed);
            } else {
                this.typeStatus = false;

                // stop the typing once we hit the last thing we wish to type.
                if (this.displayTextArrayIndex + 1 >= this.displayTextArray.length) {
                    return
                }

                setTimeout(this.eraseText, this.newTextDelay);
            }
        },
        eraseText() {
            if (this.charIndex > 0) {
                if (!this.typeStatus) {
                    this.typeStatus = true;
                }

                this.typeValue = this.displayTextArray[this.displayTextArrayIndex].substring(0, this.charIndex - 1);
                this.charIndex -= 1;

                setTimeout(this.eraseText, this.erasingSpeed);
            } else {
                this.typeStatus = false;
                this.displayTextArrayIndex++;

                setTimeout(this.typeText, this.typingSpeed + 1000);
            }
        },
    },
};

This is the new vue 3 code using

P粉099145710

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P粉6148403632024-01-11 16:33:07 1 floor

Try using ref to make the data reactive一个>:

const { ref } = Vue
const app = Vue.createApp({
  setup() {
    let typeValue = ref("")
    let typeStatus = false
    let displayTextArray = ['Art', 'Science', 'Math', 'Everything']
    let typingSpeed = 70
    let erasingSpeed = 70
    let newTextDelay = 1000
    let displayTextArrayIndex = ref(0)
    let charIndex = 0
    
    setTimeout(typeText, newTextDelay);
    
    function typeText() {
      if (charIndex < displayTextArray[displayTextArrayIndex.value].length) {
        if (!typeStatus) {
          typeStatus = true;
        }
        typeValue.value += displayTextArray[displayTextArrayIndex.value].charAt(charIndex);
        charIndex++;
        setTimeout(typeText, typingSpeed);
      } else {
        typeStatus = false;
        if (displayTextArrayIndex.value + 1 >= displayTextArray.length) {
          return
        }
        setTimeout(eraseText, newTextDelay);
      }
    }

    function eraseText() {
      if (charIndex > 0) {
        if (!typeStatus) {
          typeStatus = true;
        }
        typeValue.value = displayTextArray[displayTextArrayIndex.value].substring(0, charIndex - 1);
        charIndex -= 1;
        setTimeout(eraseText, erasingSpeed);
      } else {
        typeStatus = false;
        displayTextArrayIndex.value++;
        setTimeout(typeText, typingSpeed + 1000);
      }
    }
    return {
      typeValue, eraseText, typeText
    };
  },
})
app.mount('#demo')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<div id="demo">
  <input type="text" :value="typeValue" />
</div>

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P粉099145710

reply

Answer 1

Try using ref to make the data reactive一个>:

const { ref } = Vue
const app = Vue.createApp({
  setup() {
    let typeValue = ref("")
    let typeStatus = false
    let displayTextArray = ['Art', 'Science', 'Math', 'Everything']
    let typingSpeed = 70
    let erasingSpeed = 70
    let newTextDelay = 1000
    let displayTextArrayIndex = ref(0)
    let charIndex = 0
    
    setTimeout(typeText, newTextDelay);
    
    function typeText() {
      if (charIndex < displayTextArray[displayTextArrayIndex.value].length) {
        if (!typeStatus) {
          typeStatus = true;
        }
        typeValue.value += displayTextArray[displayTextArrayIndex.value].charAt(charIndex);
        charIndex++;
        setTimeout(typeText, typingSpeed);
      } else {
        typeStatus = false;
        if (displayTextArrayIndex.value + 1 >= displayTextArray.length) {
          return
        }
        setTimeout(eraseText, newTextDelay);
      }
    }

    function eraseText() {
      if (charIndex > 0) {
        if (!typeStatus) {
          typeStatus = true;
        }
        typeValue.value = displayTextArray[displayTextArrayIndex.value].substring(0, charIndex - 1);
        charIndex -= 1;
        setTimeout(eraseText, erasingSpeed);
      } else {
        typeStatus = false;
        displayTextArrayIndex.value++;
        setTimeout(typeText, typingSpeed + 1000);
      }
    }
    return {
      typeValue, eraseText, typeText
    };
  },
})
app.mount('#demo')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<div id="demo">
  <input type="text" :value="typeValue" />
</div>