Troubleshooting Vue.js: Why isn't the DOM updating after the data change

Struggling with a Vue.js project where the DOM fails to update after a data change. Below is the code snippet causing the issue:

Template:

<div>
  <h1 ref="title">{{ customerName }}</h1>
  <!-- Other template elements -->
</div>

Script:

async updateCustomerInformation(selectedGroup) {
  if (this.newCustomerName) {
    try {
      await axios.put(`api/groups/${selectedGroup.id}`, {
        data: { customerName: this.newCustomerName },
      }).then(result => {
        this.customerName = result.data.data.attributes.customerName;
      });
    } catch (error) {
      this.errorMessage = 'An error occurred while updating the group. Please refresh the page and try again.';
      this.snackbar = true;
    }
  }
},

The data for customerName updates correctly, but the bound DOM element does not reflect the change. Attempts to use a watch have been ineffective.

watch: {
  customerName() {
    this.$nextTick(() => {
      this.$refs.title.$forceUpdate();
    });
  }
},

If you have any advice on how to ensure the DOM updates after a data change, it would be greatly appreciated. Thank you in advance!

Answer №1

The reason for the issue is the use of this.customerName within the Axios function which causes (this) to refer to axios itself. To resolve this, consider defining it as a separate constant in the code like so:

async updateCustomerInformation(selectedGroup) {
    // define a new constant
    const self = this;
    if (this.newCustomerName) {
        try {
            await axios.put(`api/groups/${selectedGroup.id}`, {
                data: { customerName: this.newCustomerName },
            }).then(result => {
                // access the value using the constant
                self.customerName = result.data.data.attributes.customerName;
            });
        } catch (error) {
            this.errorMessage = 'An error occurred while updating the group. Please refresh the page and try again.';
            this.snackbar = true;
        }
    }
}

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