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[Vue warn]: Property or method is not defined on the instance but referenced during render

Problem [Vue warn]: Property or method “changeSetting” is not defined on the instance but referenced during render. Make sure to declare reactive data properties in the data option. (found in <MainTable>) The error is occurring because the changeSetting method is being referenced in the MainTable component here: “<button @click=’changeSetting(index)’> Info </button>” + However the changeSetting … Read more

Vue.js 3 Event Bus

As suggested in official docs you could use mitt library to dispatch events between components, let suppose that we have a sidebar and header which contains a button that close/open the sidebar and we need that button to toggle some property inside the sidebar component : in main.js import that library and create an instance … Read more

Vue.js – How to properly watch for nested data

You can use a deep watcher for that: watch: { item: { handler(val){ // do stuff }, deep: true } } This will now detect any changes to the objects in the item array and additions to the array itself (when used with Vue.set). Here’s a JSFiddle: http://jsfiddle.net/je2rw3rs/ EDIT If you don’t want to watch … Read more

Communication between sibling components in Vue.js 2.0

You can even make it shorter and use the root Vue instance as the global Event Hub: Component 1: this.$root.$emit(‘eventing’, data); Component 2: mounted() { this.$root.$on(‘eventing’, data => { console.log(data); }); }

How can I solve “Interpolation inside attributes has been removed. Use v-bind or the colon shorthand”? Vue.js 2

Use JavaScript code inside v-bind (or shortcut “:”): :href=”‘#purchase-‘ + item.id” and :id=”‘purchase-‘ + item.id” Or if using ES6 or later: :id=”`purchase-${item.id}`”

vuejs update parent data from child component

Two-way binding has been deprecated in Vue 2.0 in favor of using a more event-driven architecture. In general, a child should not mutate its props. Rather, it should $emit events and let the parent respond to those events. In your specific case, you could use a custom component with v-model. This is a special syntax … Read more

How to add external JS scripts to VueJS Components?

A simple and effective way to solve this, it’s by adding your external script into the vue mounted() of your component. I will illustrate you with the Google Recaptcha script: <template> …. your HTML </template> <script> export default { data: () => ({ ……data of your component }), mounted() { let recaptchaScript = document.createElement(‘script’) recaptchaScript.setAttribute(‘src’, … Read more