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docs(ngChange): clarify when the ngChange expression is evaluated

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Closes  #7866
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Peter Bacon Darwin
2014-07-26 10:58:25 +01:00
parent 4152155c25
commit 583f37df5e
1 changed files with 9 additions and 3 deletions
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12
src/ng/directive/input.js
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@@ -2201,9 +2201,15 @@ var ngModelDirective = function() {
* The expression is evaluated immediately, unlike the JavaScript onchange event
* which only triggers at the end of a change (usually, when the user leaves the
* form element or presses the return key).
* The expression is not evaluated when the value change is coming from the model
* or when the input does not match the pattern defined for the input in ngPattern.
*
*
* The `ngChange` expression is only evaluated when a change in the input value causes
* a new value to be committed to the model.
*
* It will not be evaluated:
* * if the value returned from the `$parsers` transformation pipeline has not changed
* * if the input has continued to be invalid since the model will stay `null`
* * if the model is changed programmatically and not by a change to the input value
*
*
* Note, this directive requires `ngModel` to be present.
*