VueJS error: 'Property or method is not defined on the instance' message appears despite the method being defined on the instance

Is there a way in Vue.js to dynamically assign the class 'adjust' based on the value of a computed property called "isTrueSet"? I keep encountering the following error message:

[Vue warn]: Property or method "itTrueSet" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://v2.vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.

found in

---> <Task> at src/components/Task.vue
     <TaskList> at src/components/TaskList.vue
       <TaskTracker> at src/components/TaskTracker.vue
         <App> at src/App.vue
           <Root>

The computed property "isTrueSet" exists within the component instance, so I'm puzzled as to why this error is appearing.

If anyone could provide insight into why this issue is occurring, I would greatly appreciate it.

Here is an excerpt from my single file component:

The template section:

src/components/Task.vue

<template>
  <div
    class="task-wrapper"
    :style="style"
    :class="[isTrueSet ? 'adjust' : '', editTask ? 'editTask' : '']"
  >
    <div class="left-task-content" :class="{ adjust: itTrueSet }">
      <h1 class="task-height task-title">
        {{ title }}
      </h1>
      <h2 class="task-date">{{ momentDate }}</h2>
    </div>
    <div class="right-task-content">
      <font-awesome-icon
        @click="toggleRemider"
        class="fa-spacer"
        icon="bell"
      ></font-awesome-icon>
      <font-awesome-icon
        @click="askToUpdateTask(id)"
        class="fa-spacer"
        icon="edit"
      ></font-awesome-icon>
      <font-awesome-icon
        @click="askToDeleteTask(id)"
        class="fa-spacer"
        icon="times-circle"
      ></font-awesome-icon>
    </div>
  </div>
</template>

The JavaScript section:

src/components/Task.vue

<script>
// JavaScript code here
</script>

A snippet from the parent component looks like this:

src/components/TaskList.vue

<template>
  <!-- Template code goes here -->
</template>

<script>
// JavaScript logic here
</script>

<style scoped>
/* Styling information */
.padding-end:last-child {
  padding-bottom: 10px;
}
</style>

Answer №1

Task.vue has this specific line:

<div class="left-task-content" :class="{ adjust: itTrueSet }">

Feedback from the comments suggests that instead of using itTrueSet, it should be changed to isTrueSet. Just switch out the it for is.

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