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docs(ngClass): Explain all 3 ways how to use ngClass

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Closes #6324.
This commit is contained in:
Brad Williams
2014-02-18 12:44:51 -08:00
committed by Tobias Bosch
parent 481508d0e7
commit 21dac2a3da
1 changed files with 12 additions and 0 deletions
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12
src/ng/directive/ngClass.js
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@@ -71,6 +71,18 @@ function classDirective(name, selector) {
* The `ngClass` directive allows you to dynamically set CSS classes on an HTML element by databinding
* an expression that represents all classes to be added.
*
* The directive operates in three different ways, depending on which of three types the expression
* evaluates to:
*
* 1. If the expression evaluates to a string, the string should be one or more space-delimited class
* names.
*
* 2. If the expression evaluates to an array, each element of the array should be a string that is
* one or more space-delimited class names.
*
* 3. If the expression evaluates to an object, then for each key-value pair of the
* object with a truthy value the corresponding key is used as a class name.
*
* The directive won't add duplicate classes if a particular class was already set.
*
* When the expression changes, the previously added classes are removed and only then the