One of my code snippets in vue.js looks like this:
<q-btn @click="goEditMode" color="primary" icon="edit" label="Edit"
v-if="this.form.userName.toLowerCase() !== 'admin'" />
An issue arises after I introduced toLowerCase() function.
Below is the error message that appears:
[Vue warn]: Error in render: "TypeError: Cannot read property 'toLowerCase' of undefined"
I would greatly appreciate any assistance on this matter. Thank you!
Using the condition "v-if="this.form.userName && this.form.userName.toLowerCase() !== 'admin'" />", you are able to achieve this.This task is possible.
It is necessary to eliminate the this. from your template
v-if="form.userName.toLowerCase() !== 'admin'"
Here is a demonstration:
Vue.createApp({
data() {
return {
query: 'oNe'
}
}
}).mount('#app')<script src="https://unpkg.com/vue@next"></script>
<div id="app" class="demo">
<div v-if="query.toLowerCase() !== 'one'">one</div>
<div v-if="query.toLowerCase() !== 'two'">two</div>
</div>Another example for demonstration:
You can create a computed property to determine a condition:
Vue.createApp({
data() {
return {
role: 'aDmIn'
}
},
computed: {
isAdmin() {
if (this.role.toLowerCase() === 'admin') {
return true
} else {
return false
}
}
}
}).mount('#app')<script src="https://unpkg.com/vue@next"></script>
<div id="app" class="demo">
<div v-if="isAdmin">is admin</div>
<div v-if="!isAdmin">is user</div>
</div>The issue arises from calling undefined.toLowerCase().
It appears that you are using toLowerCase on a property that does not exist in its parent.
To resolve this, verify if this.form.userName exists before proceeding.
You can handle it like this.
this.form.userName ? this.form.userName.toLowerCase() : ''
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