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

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

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[Vue warn]: Property or method "Boston" is not defined on the instance but referenced during render
Tag : vue.js , By : Longchao Dong
Date : January 12 2021, 09:11 PM

This might help you :agency1="Boston" is shorthand for v-bind:agency1="Boston". It attempts to bind a data property named Boston, but you don't have one defined. :agency1="3" works because 3 is a literal. If you were attempting to assign the literal string "Boston" to agency1, don't use the preceding colon:
<WorkStationView :agency1="Boston">
--> <!-- DON'T DO THIS -->

<WorkStationView agency1="Boston">

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should only ever be a child of

Vue 2.1 [Vue warn]: Property or method "_leaving" is not defined on the instance but referenced during render

Tag : vue.js , By : toma
Date : March 29 2020, 07:55 AM
hope this fix your issue Just update again, problem has been fixed: see https://github.com/vuejs/vue/issues/4300

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

Tag : javascript , By : agjimenez
Date : March 29 2020, 07:55 AM
help you fix your problem When you pass an empty attribute to jade, as far as I know, what it interprets, in plain HTML, is attribute="attribute". The actual HTML in your case is v-focus="v-focus", which vue interprets as an expression using a property, v, that doesn't exist.
You could try input(v-focus="true") as it doesn't really matter the value passed to that directive.

20 errors in relation to "[Vue Warn] property or method not defined on instance but referenced during render"

Tag : javascript , By : Oli
Date : March 29 2020, 07:55 AM
With these it helps I have a number of errors in my code, coming up as , try to write this:
data() {
    return {
      tableItems: ''
    data: {
tableItems: [ ' ' ],
    data: {
tableItems: [ ' ' ]

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

Tag : vue.js , By : Jason Jennings
Date : March 29 2020, 07:55 AM
I hope this helps you . Create a javascript file. for example game.js . move the code to that file..
 new Vue({
        playerHealth: 100,
        monsterHealth: 100,
        StartGame: function(){
            this.gameIsRunning  = true;
            this.playerHealth = 100;
            this.monsterHealth = 100;
        attack: function(){
            // var max = 10;
            // var min = 3;
            // var damage = this.calculateDamage(3,10);
            this.monsterHealth -= this.calculateDamage(3,10);;


            // if(this.monsterHealth <= 0){
            //     alert("we won");
            //     this.gameIsRunning = false;
            //     return;
            // }

            // max = 12;
            // min = 5;
            // damage = this.calculateDamage(5,12);
            this.playerHealth -= this.calculateDamage(5,12);;

            // if(this.playerHealth <= 0){
            //     alert("we lost");
            //     this.gameIsRunning = false;
            //     return;
            // }

            this.monsterHealth -= this.calculateDamage(10,10);;
            this.playerHealth -= this.calculateDamage(5,12);;
        heal: function(){

        giveUp: function(){

        calculateDamage: function(min, max){
            return Math.max(Math.floor(Math.random() * max) + 1, min);
        checkWin: function(){
            if(this.monsterHealth <= 0){
                if(confirm("You won! New Game?")){
                    this.gameIsRunning = false;
                return true;
            else if(this.playerHealth <= 0){
                if(confirm("You lost! New Game?")){
                    this.gameIsRunning = false;
                return true;
<script src="app.js"></script>
<script src="https://YOURDOMAIN.COM/game.js"></script> 

Error: vue.js:634 [Vue warn]: Property or method "item" is not defined on the instance but referenced during r

Tag : javascript , By : Alex Bartzas
Date : March 29 2020, 07:55 AM
this will help The issue is due to your invalid HTML.
Vue is validating your document structure and since
, , or (see : The Table Row element - Technical summary - Permitted parents), your v-for expression is not evaluated.
new Vue({
  delimiters: ['[[', ']]'],
  el: "#app",
  data: {
    main: [
      { name: "Learn JavaScript", done: false },
      { name: "Learn Vue", done: false },
      { name: "Play around in JSFiddle", done: true },
      { name: "Build something awesome", done: true }
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script>

<div id="app">
  <table border="1">
    <tr v-for="item in main" >
      <th scope="row">[[ item.name ]]</th>
      <td>[[ item.done ? '✔️' : '❌' ]]</td>
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