Bluetooth accessories sometimes require a minimum Bluetooth specification (version) in order to work with full functionality.
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To see which Bluetooth version is on your PC
- In the search box on the taskbar, type device manager, then select it from the results.
- Select the arrow next to Bluetooth to expand it.
- Select the Bluetooth radio listing (yours might simply be listed as a wireless device).
- Select the Advanced tab, then look for the LMP (Link Manager Protocol) listing in the Firmware or Firmware version area. That number tells you what LMP version you have on your device.
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Find your version number on the table below to map your LMP version to its Bluetooth Core Specification number. That's the highest core specification your device fully supports. Accessories with higher specifications may still work, but with reduced functionality.
Link Manager Protocol Version (LMP) | Bluetooth Core Specification |
LMP 0 | Bluetooth Core Specification 1.0b (withdrawn) |
LMP 1 | Bluetooth Core Specification 1.1 (withdrawn) |
LMP 2 | Bluetooth Core Specification 1.2 (withdrawn) |
LMP 3 | Bluetooth Core Specification 2.0 + EDR (withdrawn) |
LMP 4 | Bluetooth Core Specification 2.1 + EDR (deprecated, to be withdrawn) |
LMP 5 | Bluetooth Core Specification 3.0 + HS (deprecated, to be withdrawn) |
LMP 6 | Bluetooth Core Specification 4.0 |
LMP 7 | Bluetooth Core Specification 4.1 |
LMP 8 | Bluetooth Core Specification 4.2 |
LMP 9 | Bluetooth Core Specification 5.0 |
LMP 10 | Bluetooth Core Specification 5.1 |
LMP 11 | Bluetooth Core Specification 5.2 |
You’re browsing the documentation for v2.x and ealier. For v3.x, click here.
A common need for data binding is manipulating an element’s class list and its inline styles. Since they are both attributes, we can use
v-bind
to handle them: we only need to calculate a final string with our expressions. However, meddling with string concatenation is annoying and error-prone. For this reason, Vue provides special enhancements when v-bind
is used with class
and style
. In addition to strings, the expressions can also evaluate to objects or arrays.Binding HTML Classes
Object Syntax
We can pass an object to
v-bind:class
to dynamically toggle classes:The above syntax means the presence of the
active
class will be determined by the truthiness of the data property isActive
.You can have multiple classes toggled by having more fields in the object. In addition, the
v-bind:class
directive can also co-exist with the plain class
attribute. So given the following template:And the following data:
It will render:
When
isActive
or hasError
changes, the class list will be updated accordingly. For example, if hasError
becomes true
, the class list will become 'static active text-danger'
.The bound object doesn’t have to be inline:
This will render the same result. We can also bind to a computed property that returns an object. This is a common and powerful pattern:
Array Syntax
We can pass an array to
v-bind:class
to apply a list of classes:Which will render:
If you would like to also toggle a class in the list conditionally, you can do it with a ternary expression:
English Class Pro 5 3 00
This will always apply
errorClass
, but will only apply activeClass
when isActive
Cisdem video converter 5 2 0 3. is truthy.However, this can be a bit verbose if you have multiple conditional classes. That’s why it’s also possible to use the object syntax inside array syntax:
With Components
This section assumes knowledge of Vue Components. Feel free to skip it and come back later.
When you use the
class
attribute on a custom component, those classes will be added to the component’s root element. Existing classes on this element will not be overwritten.For example, if you declare this component:
Then add some classes when using it:
The rendered HTML will be:
The same is true for class bindings:
When
isActive
is truthy, the rendered HTML will be:Binding Inline Styles
Object Syntax
The object syntax for
v-bind:style
is pretty straightforward - it looks almost like CSS, except it’s a JavaScript object. You can use either camelCase or kebab-case (use quotes with kebab-case) for the CSS property names:It is often a good idea to bind to a style object directly so that the template is cleaner:
Again, the object syntax is often used in conjunction with computed properties that return objects.
Array Syntax
The array syntax for
v-bind:style
allows you to apply multiple style objects to the same element:Auto-prefixing
When you use a CSS property that requires vendor prefixes in
v-bind:style
, for example transform
, Vue will automatically detect and add appropriate prefixes to the applied styles.Multiple Values
2.3.0+
Starting in 2.3.0+ you can provide an array of multiple (prefixed) values to a style property, for example:
This will only render the last value in the array which the browser supports. In this example, it will render
display: flex
for browsers that support the unprefixed version of flexbox.5 Class English Book
← Computed Properties and WatchersConditional Rendering →
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