Progress bars are used in an interface to pass on information to users related to the known progression of a certain operation. They visually signify how far the operation has advanced and can be circular or horizontal. They can also be indefinite to indicate the loading or processing of data. In this article, we’re going to learn how to create a horizontal progress bar with the Vuetify progress linear component.
The v-progress-linear Component
Vuetify provides the v-progress-linear component for creating a horizontal progress bar.
<template>
<v-app>
<v-progress-linear></v-progress-linear>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Progress Bar Value
The progress linear component comes with the value prop that we can use to set the progress bar to a determinate value between 0 and 100 inclusive:
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="6">
<v-progress-linear value="40"></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Progress Linear v-model
We can set up a two-way binding between the value of the progress bar and a variable using v-model:
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="6">
<v-progress-linear v-model="value"></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
data: () => ({
value: 30,
}),
};
</script>
To see this two-way binding in action, let’s create two buttons to change the progress bar value and some text to display this value. We spaced the buttons apart with one of the Vuetify spacing helper classes (ma-2).
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="6">
<v-row>
<v-progress-linear v-model="value"></v-progress-linear>
</v-row>
<v-row justify="center">{{ value }}%</v-row>
<v-row justify="center">
<v-btn class="ma-2" @click="value -= 10" color="red" dark>
-10
</v-btn>
<v-btn class="ma-2" @click="value += 10" color="green" dark>
+10
</v-btn>
</v-row>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
data: () => ({
value: 30,
}),
};
</script>
Progress Linear Buffer Value
A buffer state simultaneously represents two values. The primary value is controlled by v-model, while the buffer value is controlled by the buffer-value prop:
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear
v-model="value"
:buffer-value="bufferValue"
></v-progress-linear>
<br />
<v-progress-linear
v-model="value"
:buffer-value="bufferValue"
color="green"
></v-progress-linear>
<br />
<v-progress-linear
v-model="value"
:buffer-value="bufferValue"
color="orange"
></v-progress-linear>
<br />
<v-progress-linear
v-model="value"
:buffer-value="bufferValue"
color="purple accent-4"
></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
data() {
return {
value: 10,
bufferValue: 20,
interval: 0,
};
},
watch: {
value(val) {
if (val < 100) return;
this.value = 0;
this.bufferValue = 10;
this.startBuffer();
},
},
mounted() {
this.startBuffer();
},
beforeDestroy() {
clearInterval(this.interval);
},
methods: {
startBuffer() {
clearInterval(this.interval);
this.interval = setInterval(() => {
this.value += Math.random() * (15 - 5) + 5;
this.bufferValue += Math.random() * (15 - 5) + 6;
}, 1000);
},
},
};
</script>
Progress Bar Custom Colors
The Vuetify progress linear component comes with a color prop that allows us to customize the color of the horizontal progress bar:
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear
background-color="blue"
color="red accent-2"
value="20"
></v-progress-linear>
<br />
<v-progress-linear
background-color="grey"
color="yellow"
value="40"
></v-progress-linear>
<br />
<v-progress-linear
background-color="green lighten-3"
color="green"
value="60"
></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Progress Linear Indeterminate
We can display an indeterminate progress bar with the indeterminate prop.
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear indeterminate color="red"></v-progress-linear>
<br />
<v-progress-linear indeterminate color="primary"></v-progress-linear>
<br />
<v-progress-linear indeterminate color="green"></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
The progress bar will animate continuously when indeterminate:
Reversed Progress Bar
Setting the reverse prop to true will display a reversed progress bar (right to left in LTR mode and left to right in RTL).
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear
color="indigo"
value="15"
reverse
></v-progress-linear>
<br />
<v-progress-linear
color="teal"
indeterminate
reverse
></v-progress-linear>
<br />
<v-progress-linear
buffer-value="55"
color="red accent-2"
reverse
stream
value="30"
></v-progress-linear>
<br />
<v-subheader
>In specific cases you may want progress to display in left-to-right
mode regardless of the application direction (LTR or
RTL):</v-subheader
>
<v-progress-linear
:reverse="$vuetify.rtl"
value="15"
color="yellow darken-3"
></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Progress Linear Rounded
We can add a border radius to the Vuetify progress linear component by setting the rounded prop to true:
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear
color="blue accent-2"
rounded
value="100"
></v-progress-linear>
<br />
<v-progress-linear color="pink" rounded value="100"></v-progress-linear>
<br />
<v-progress-linear
color="orange"
rounded
value="100"
></v-progress-linear>
<br />
<v-progress-linear
color="purple accent-4"
rounded
value="100"
></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Progress Bar Stream
The stream prop works with buffer-value to inform the user that some action is taking place.
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear
color="yellow darken-3"
buffer-value="0"
stream
></v-progress-linear>
<br />
<v-progress-linear
color="primary"
buffer-value="0"
value="20"
stream
></v-progress-linear>
<br />
<v-progress-linear
buffer-value="50"
stream
color="red"
></v-progress-linear>
<br />
<v-progress-linear
buffer-value="60"
value="40"
stream
color="green"
></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Striped Progress Bar
The striped prop applies a striped background over the value portion of the horizontal progress bar.
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear
color="indigo"
height="10"
value="10"
striped
></v-progress-linear>
<br />
<v-progress-linear
color="cyan"
height="10"
value="20"
striped
></v-progress-linear>
<br />
<v-progress-linear
height="10"
value="45"
striped
color="green"
></v-progress-linear>
<br />
<v-progress-linear
value="60"
height="10"
striped
color="orange"
></v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Default Slot
With the default slot of the progress linear component, we can display custom components inside the progress bar.
<template>
<v-app>
<v-row justify="center" class="ma-4">
<v-col sm="8">
<v-progress-linear
:indeterminate="query"
:query="true"
height="25"
value="30"
>
<template v-slot:default="{ value }">
<strong>{{ value }}%</strong>
</template>
</v-progress-linear>
</v-col>
</v-row>
</v-app>
</template>
<script>
export default {
name: 'App',
data: () => ({
query: false,
}),
};
</script>
Here, we simply display the progress bar value as a percentage:
Using a Progress Bar as a Loading Indicator
One instance where the progress linear component is useful is in communicating to the user that a response is pending. Like when fetching the user’s photos from a server in a sample photo app.
<template>
<v-app>
<v-app-bar app color="primary" dark>
<v-app-bar-nav-icon></v-app-bar-nav-icon>
<v-toolbar-title>Photos</v-toolbar-title>
<v-spacer></v-spacer>
<v-btn icon>
<v-icon>mdi-share-variant</v-icon>
</v-btn>
<v-btn icon>
<v-icon>mdi-magnify</v-icon>
</v-btn>
<v-btn icon>
<v-icon>mdi-dots-vertical</v-icon>
</v-btn>
</v-app-bar>
<v-container style="flex: 1">
<v-row class="fill-height" align-content="center" justify="center">
<v-col class="text-subtitle-1 text-center" cols="12">
Getting your photos
</v-col>
<v-col cols="6">
<v-progress-linear
color="primary"
indeterminate
rounded
height="6"
></v-progress-linear>
</v-col>
</v-row>
</v-container>
</v-app>
</template>
<script>
export default {
name: 'App',
};
</script>
Using a Progress Bar as an App Bar Loader
A progress bar can also function as an app bar loader. With the absolute and bottom props, we can position it at the bottom of the app bar and control its visibility with the active prop:
<template>
<v-app>
<v-system-bar>
<v-spacer></v-spacer>
<v-icon>mdi-square</v-icon>
<v-icon>mdi-circle</v-icon>
<v-icon>mdi-triangle</v-icon>
</v-system-bar>
<v-app-bar app color>
<v-btn icon>
<v-icon>mdi-arrow-left</v-icon>
</v-btn>
<v-toolbar-title>Books</v-toolbar-title>
<v-progress-linear
:active="loading"
:indeterminate="loading"
absolute
bottom
color="indigo"
></v-progress-linear>
<v-spacer></v-spacer>
<v-btn icon>
<v-icon>mdi-magnify</v-icon>
</v-btn>
<v-btn icon>
<v-icon>mdi-dots-vertical</v-icon>
</v-btn>
</v-app-bar>
<v-container style="flex: 1">
<v-row class="fill-height" align="center" justify="center">
<v-scale-transition>
<div v-if="!loading" class="text-center">
<v-btn color="indigo" dark @click="loading = true">
Start loading
</v-btn>
</div>
</v-scale-transition>
</v-row>
</v-container>
</v-app>
</template>
<script>
export default {
name: 'App',
data: () => ({
loading: false,
}),
watch: {
loading(val) {
if (!val) return;
setTimeout(() => (this.loading = false), 3000);
},
},
};
</script>
Conclusion
A progress bar conveys information to the user about the current progress of an ongoing event in an application. Use the Vuetify progress linear component (v-progress-linear) and its various props to create and customize horizontal linear progress bars.
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