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Clarify falsy conditions for attribute description #1271

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Nov 10, 2017
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Clarify falsy conditions for attribute description #1271

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00a1310
clarify falsy conditions for attribute description
sdras Nov 10, 2017
255cf81
Tweak v-bind boolean example
chrisvfritz Nov 10, 2017
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6 changes: 4 additions & 2 deletions src/v2/guide/syntax.md
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Expand Up @@ -42,18 +42,20 @@ The contents of this `div` will be replaced with the value of the `rawHtml` prop

### Attributes

Mustaches cannot be used inside HTML attributes, instead use a [v-bind directive](../api/#v-bind):
Mustaches cannot be used inside HTML attributes. Instead, use a [v-bind directive](../api/#v-bind):

``` html
<div v-bind:id="dynamicId"></div>
```

It also works for boolean attributes - the attribute will be removed if the condition evaluates to a falsy value:
In the case of boolean attributes, where their mere existence implies `true`, `v-bind` works a little differently. In this example:

``` html
<button v-bind:disabled="isButtonDisabled">Button</button>
```

If `isButtonDisabled` has the value of `null`, `undefined`, or `false`, the `disabled` attribute will not even be included in the rendered `<button>` element.

### Using JavaScript Expressions

So far we've only been binding to simple property keys in our templates. But Vue.js actually supports the full power of JavaScript expressions inside all data bindings:
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