A guide on accessing and utilizing methods within App.vue from Vue components

Question

A guide on accessing and utilizing methods within App.vue from Vue components

I am working with a Vue component and a vue element declaration. Here is the code snippet:

Vue.component('todo-item', {
    template: '<li>This is a todo</li>',
    methods: {
        test: function() {
            
            // There seems to be an error here
            app.aNewFunction();
        }
    }
})

var app = new Vue({
    el: '#app',
    data: {
        message: 'Hello Vue!'
    },
    methods: {
        aNewFunction: function() {
            alert("inside");
        }
    }
})

Can someone guide me on how to call a method in the Vue app from the Vue component?

javascript vue.js vuejs2 vue-component

Answer 1

Answer №1

To execute a root instance method, use the following syntax: this.$root.methodName()

Vue.component('todo-item', {
    template: '<li>This is a todo</li>',
    methods: {
        test: function() {
            this.$root.aNewFunction();
        }
    },
    mounted() {
        this.test();
    }
})
  
new Vue({
    el: '#app',
    template: '<todo-item></todo-item>',
    methods: {
        aNewFunction: function() {
            alert("inside");
        }
    }
})

Answer 2

To execute a root instance method, use the following syntax: this.$root.methodName()

Vue.component('todo-item', {
    template: '<li>This is a todo</li>',
    methods: {
        test: function() {
            this.$root.aNewFunction();
        }
    },
    mounted() {
        this.test();
    }
})
  
new Vue({
    el: '#app',
    template: '<todo-item></todo-item>',
    methods: {
        aNewFunction: function() {
            alert("inside");
        }
    }
})

Answer 3

Answer №2

An alternative approach that aligns well with the Vue.js architecture is to utilize event listeners and emitters between a child component and its parent for effective communication.

Feel free to explore this simple fiddle for a visual demonstration.

Vue.component('todo-item', {
    template: '<li>This is a todo</li>',
    methods: {
        test: function() {
            console.log('Emitting this Event.');
            this.$emit('yourevent');
        }
    },
    created() {
        this.test();
    }
});

new Vue({
    el: '#vue-app',
    data: {
        'message': '',
    },
    methods: {
        aNewFunction(event) {
            console.log('Yourevent Is Triggered!');
            this.message = 'Do Stuff...';
        },
    }
});

Answer 4

An alternative approach that aligns well with the Vue.js architecture is to utilize event listeners and emitters between a child component and its parent for effective communication.

Feel free to explore this simple fiddle for a visual demonstration.

Vue.component('todo-item', {
    template: '<li>This is a todo</li>',
    methods: {
        test: function() {
            console.log('Emitting this Event.');
            this.$emit('yourevent');
        }
    },
    created() {
        this.test();
    }
});

new Vue({
    el: '#vue-app',
    data: {
        'message': '',
    },
    methods: {
        aNewFunction(event) {
            console.log('Yourevent Is Triggered!');
            this.message = 'Do Stuff...';
        },
    }
});

A guide on accessing and utilizing methods within App.vue from Vue components

Answer №1

Answer №2

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