# Progress

> Use our custom progress component for displaying simple or complex progress
bars, featuring support for horzontally stacked bars, animated backgrounds, and text labels.

```html
<template>
<div>
    <b-progress :value="counter" :max="max" show-progress animated></b-progress>
    <b-progress class="mt-1" :max="max" show-value>
      <b-progress-bar :value="counter*(6/10)" variant="success"></b-progress-bar>
      <b-progress-bar :value="counter*(2.5/10)" variant="warning"></b-progress-bar>
      <b-progress-bar :value="counter*(1.5/10)" variant="danger"></b-progress-bar>
    </b-progress>
    <b-btn class="mt-4" @click="clicked">Click me</b-btn>
</div>
</template>

<script>
export default {
  data: {
    counter: 45,
    max: 100
  },
  methods: {
    clicked() {
      this.counter = Math.random() * this.max;
      console.log("Change progress to " +
        Math.round(this.counter * 100) / 100);
    }
  }
}
</script>

<!-- progress-1.vue -->
```
## Value
Set the maximum value with the `max` prop (default is `100`), and the current value via the
`value` prop (default `0`).

When creating multiple bars in a sinple process, place hte value prop on the individual
`<b-progress-bar>` sub components (see the **Multiple Bars** section below for more details)

## Labels
Add labels to your progress bars by either enabling `show-progress` (percentage of max) or
`show-value`for the current absolute value. You may also set the precision (number of
digits after the decimal) via the `precision` prop (default is `0`digits after the decimal).

```html
<template>
  <div>
    <h5>No label</h5>
    <b-progress :value="value" :max="max" class="mb-3"></b-progress>
    <h5>Value label</h5>
    <b-progress :value="value" :max="max" show-value class="mb-3"></b-progress>
    <h5>Progress label</h5>
    <b-progress :value="value" :max="max" show-progress class="mb-3"></b-progress>
    <h5>Value label with precision</h5>
    <b-progress :value="value" :max="max" :precision="2" show-value class="mb-3"></b-progress>
    <h5>Progress label with precision</h5>
    <b-progress :value="value" :max="max" :precision="2" show-progress class="mb-3"></b-progress>
  </div>
</template>

<script>
export default {
  data: {
    max: 50,
    value: 33.333333333
  }
}
</script>

<!-- progress-labels.vue -->
```

### Custom progress label
Need more control over the label? Provide your own label by using the default slot within
a `<b-progress-bar>` sub-component, or by using the `label` prop on `<b-progress-bar>`
(HTML supported):

```html
<template>
  <div>
    <h5>Custom Label via Default Slot</h5>
    <b-progress :max="max">
      <b-progress-bar :value="value">
        Progress: <strong>{{ value.toFixed(3) }} / {{ max }}</strong>
      </b-progress-bar>
    </b-progress>
    
    <h5 class="mt-3">Custom Label via Prop</h5>
    <b-progress :max="max">
      <b-progress-bar :value="value" :label="'&lt;'+value.toFixed(0)+'&gt;'">
      </b-progress-bar>
    </b-progress>
  </div>
</template>

<script>
export default {
  data: {
    max: 50,
    value: 33.333333333
  }
}
</script>

<!-- progress-custom-labels.vue -->
```

Precedence order for label methods:
- default slot of `<b-progress-bar>`
- `label` prop of `<b-progress-bar>`
- `show-progress` prop of `<b-progress-bar>`
- `show-value` prop of `<b-progress-bar>`
- `show-progress` prop of `<b-progress>`
- `show-value` prop of `<b-progress>`
- no label


## Width and Height
`<b-progress>` will always expand to the maximum with of it's parent container. To
change the width, place `<b-progress>` in a standard Bootstrap column or apply
one of the standard Bootstrap width classes.

```html
<template>
  <div>
    <h5>Default width</h5>
    <b-progress :value="value" class="mb-3"></b-progress>
    <h5>Custom widths</h5>
    <b-progress :value="value" class="w-75 mb-2"></b-progress>
    <b-progress :value="value" class="w-50 mb-2"></b-progress>
    <b-progress :value="value" class="w-25"></b-progress>
  </div>
</template>

<script>
export default {
  data: {
    value: 75
  }
}
</script>

<!-- progress-width.vue -->
```

The height of the progress bar can be controled with the `height` prop. The height
value should be a standard CSS dimension (`px`, `rem`, `em`, etc). The default
height is `1rem`.

```html
<template>
  <div>
    <h5>Default height</h5>
    <b-progress :value="value" show-progress class="mb-3"></b-progress>
    <h5>Custom heights</h5>
    <b-progress height="2rem" :value="value" show-progress class="mb-2"></b-progress>
    <b-progress height="20px" :value="value" show-progress class="mb-2"></b-progress>
    <b-progress height="2px" :value="value"></b-progress>
  </div>
</template>

<script>
export default {
  data: {
    value: 75
  }
}
</script>

<!-- progress-height.vue -->
```

## Backgrounds
Use background variants to change the appearance of individual progress bars.
The default variant is `primary`.

### Solid background variants

```html
<template>
  <div>
    <div v-for="bar in bars" class="row mb-1">
      <div class="col-sm-2">{{ bar.variant }}:</div>
      <div class="col-sm-10 pt-1">
        <b-progress :value="bar.value"
                    :variant="bar.variant"
                    :key="bar.variant"
        ></b-progress>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data: {
    bars: [
      {variant:'success', value:75},
      {variant:'info', value:75},
      {variant:'warning', value:75},
      {variant:'danger', value:75},
      {variant:'primary', value:75},
      {variant:'secondary', value:75},
      {variant:'dark', value:75}
    ],
    timer: null
  },
  mounted() {
    this.timer = setInterval(() => {
      this.bars.forEach(bar => bar.value = 25 + (Math.random() * 75));
    }, 2000);
  },
  destroyed() {
    clearInterval(this.timer);
  }
}
</script>

<!-- progress-backgrounds.vue -->
```

### Striped backgrounds
Set `striped` to apply a stripe via CSS gradient over the progress bar’s
background variant.

```html
<template>
  <div>
    <b-progress :value="25" variant="success" :striped="striped" class="mb-2"></b-progress>
    <b-progress :value="50" variant="info" :striped="striped" class="mb-2"></b-progress>
    <b-progress :value="75" variant="warning" :striped="striped" class="mb-2"></b-progress>
    <b-progress :value="100" variant="danger" :striped="striped" class="mb-2"></b-progress>
    <b-button variant="secondary" @click="striped = !striped">
      {{ striped ? 'Remove' : 'Add'}} Striped
    </b-button>
  </div>
</template>

<script>
export default {
  data: {
    striped: true
  }
}
</script>

<!-- progress-striped.vue -->
```

### Animated backgrounds
The striped gradient can also be animated by setting the `animated`prop.

```html
<template>
  <div>
    <b-progress :value="25" variant="success" striped :animated="animate" class="mb-2"></b-progress>
    <b-progress :value="50" variant="info" striped :animated="animate" class="mb-2"></b-progress>
    <b-progress :value="75" variant="warning" striped :animated="animate" class="mb-2"></b-progress>
    <b-progress :value="100" variant="danger" :animated="animate" class="mb-3"></b-progress>
    <b-button variant="secondary" @click="animate = !animate">
      {{ animate ? 'Stop' : 'Start'}} Animation
    </b-button>
  </div>
</template>

<script>
export default {
  data: {
    animate: true
  }
}
</script>

<!-- progress-animated.vue -->
```

Notes:
 - if `animated` is true, `striped` will automatically be enabled.
 - Animated progress bars don’t work in Opera 12 — as they don’t support CSS3 animations.


## Multiple bars
Include multiple `<b-progress-bar>` sub-components in a `<b-progress>` component to build
a horizontally stacked set of progress bars.

```html
<template>
  <div>
    <b-progress :max="max" class="mb-3">
      <b-progress-bar variant="primary" :value="values[0]"></b-progress-bar>
      <b-progress-bar variant="success" :value="values[1]"></b-progress-bar>
      <b-progress-bar variant="info" :value="values[2]"></b-progress-bar>
    </b-progress>
    <b-progress show-progress :max="max" class="mb-3"></b-progress-bar>
      <b-progress-bar variant="primary" :value="values[0]"></b-progress-bar>
      <b-progress-bar variant="success" :value="values[1]"></b-progress-bar>
      <b-progress-bar variant="info" :value="values[2]"></b-progress-bar>
    </b-progress>
    <b-progress show-value striped :max="max" class="mb-3"></b-progress-bar>
      <b-progress-bar variant="primary" :value="values[0]"></b-progress-bar>
      <b-progress-bar variant="success" :value="values[1]"></b-progress-bar>
      <b-progress-bar variant="info" :value="values[2]"></b-progress-bar>
    </b-progress>
    <b-progress :max="max" class="mb-3">
      <b-progress-bar variant="primary" :value="values[0]" show-progress></b-progress-bar>
      <b-progress-bar variant="success" :value="values[1]" animated show-progress></b-progress-bar>
      <b-progress-bar variant="info" :value="values[2]" striped show-progress></b-progress-bar>
    </b-progress>
  </div>
</template>

<script>
export default {
  data: {
    max: 100,
    values: [ 15, 30, 20 ]
  }
}
</script>

<!-- progress-multiple.vue -->
```

`<b-prgress-bar>` will inherit most of the props from the `<b-progress>` parent component,
but you can override any of the props by setting them on the `<b-progress-bar>`

Notes:
- `height`, if speified, should always set on the `<b-progress>` component.
- `<b-progress-bar>` will not inherit `value` from `<b-progress>`.


## Component Reference
