What is the best way to update input elements within a session using Vue.js?

Upon opening the input screen, the input items are populated with session information. However, when jQuery switches display based on the input item's value, it refers to the initial value in the program rather than the session information. This suggests that the display switch occurs before setting the session data (the initial data is pre-set in the input item).

For instance, even if a session is established as seen in the source below, the screen still displays the category content as 1.

The concerning issue is the warning message displayed below:

[Vue warn]: Avoid adding reactive properties to a Vue instance or its root $ data at runtime-declare it upfront in the data option.

data: {
    url: "",
    category: 1,
    errors: {},
},
created: function() {
    let count_data = 0;
    for (let key in old_data) {
        if (old_data[key] != null && old_data[key] != "") {
            count_data += 1;
        }
    }
    if(count_data > 0) {
        for(let key in old_data){
            this.$set(this, key, old_data[key]);
        }
    }else{
        let that = this;
        axios.get('api/getSession')
            .then(res => {
                Object.entries(res.data).map(function(data){
                    that.$set(that, data[0], data[1]);
                });
            })
    }
},

Answer №1

Whenever a new property is added to the data object, a console message will be displayed. While properties like "category" or "url" should not trigger this message, any other unknown property will.

To avoid this, it's recommended to monitor all instances where $set is utilized to ensure that neither key nor data[0] introduce an unfamiliar property. If such a property is detected, consider adding it to the data object as either null or an empty string.

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