What causes the v-for in a template to only update when the input text changes?

Question

What causes the v-for in a template to only update when the input text changes?

I'm currently working on a Vue.js code, but I'm facing an issue where the template isn't updating when new data is added to the input text. My goal is for the list to update when the @click event occurs.

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methods: {
    addModule:function(){
        var size = Object.keys( this.modules ).length;
        this.modules[size] = {
            enumerate: '1.1',
            name: 'test',
            description: 'test d',
            type: 'module',
            criteria: {}
        };
        console.log(this.modules);
    }
}

javascript vue.js

Answer 1

Answer №1

Seems like you're encountering a challenge with object change detection as outlined in the vue.js documentation. In this case, it appears that when you add a new property to an object that didn't exist previously, the change goes unnoticed.

One way to address this issue is by using the following approach:

methods: {
    addModule:function(){
        var size = Object.keys( this.modules ).length;
        this.modules[size] = {
            enumerate: '1.1',
            name: 'test',
            description: 'test d',
            type: 'module',
            criteria: {}
        };
        this.modules = Object.assign({}, this.modules);
        console.log(this.modules);
    }
}

The addition of this specific line will essentially create a duplicate of the original object. By working with this cloned object instead, any modifications made are guaranteed to be recognized by the system.

Keep in mind, if deep cloning is required, additional steps will be necessary.

Answer 2

Seems like you're encountering a challenge with object change detection as outlined in the vue.js documentation. In this case, it appears that when you add a new property to an object that didn't exist previously, the change goes unnoticed.

One way to address this issue is by using the following approach:

methods: {
    addModule:function(){
        var size = Object.keys( this.modules ).length;
        this.modules[size] = {
            enumerate: '1.1',
            name: 'test',
            description: 'test d',
            type: 'module',
            criteria: {}
        };
        this.modules = Object.assign({}, this.modules);
        console.log(this.modules);
    }
}

The addition of this specific line will essentially create a duplicate of the original object. By working with this cloned object instead, any modifications made are guaranteed to be recognized by the system.

Keep in mind, if deep cloning is required, additional steps will be necessary.

Answer 3

Answer №2

Vue.js may not recognize a newly added property in an object. Check out the details at this link

To address this issue, you can utilize Vue.set():

var count = Object.keys( this.items ).length;
        Vue.set(this.items,count,{
            id: '1',
            name: 'example',
            description: 'sample description',
            type: 'item',
            details: {}
        });

Answer 4

Vue.js may not recognize a newly added property in an object. Check out the details at this link

To address this issue, you can utilize Vue.set():

var count = Object.keys( this.items ).length;
        Vue.set(this.items,count,{
            id: '1',
            name: 'example',
            description: 'sample description',
            type: 'item',
            details: {}
        });

What causes the v-for in a template to only update when the input text changes?

Answer №1

Answer №2

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