Variable set in ng-repeat not being created

问题

Following this question on how to determine number of filtered out elements, I created the following angular code:

<input type="text" ng-model="query" placeholder="Enter query...">
<div ng-if="filteredData.length!=data.length"> Showing {{filteredData.length}} of {{data.length}}</div>
<div ng-repeat="datum in filteredData = (data | orderBy: 'name' : reverse | filter:query)"> 
    ....
</div>

However, for some reason filteredData never actually gets set and Showing of 10 always appears. I used this answer to get the scope variable for my controller, but filteredData doesn't show up there despite all the other variables showing up.

Also worth noting: the contents of the repeat work fine, its just that filteredData that isnt being set.

回答1:

I believe this is because you are trying to set filteredData within your ng-repeat.

You should probably be setting filteredData to be a filtered set of your data in the controller. That way you are just looping in your repeat statement.

<div ng-repeat="datum in filteredData | orderBy: 'name' : reverse | filter:query"> 
    ....
</div>

It's also probably worth noting that angular filter in ng-repeat wont edit your array's length. So in the case that your code actually DID work the filteredData.length wouldn't change.

来源：https://stackoverflow.com/questions/26341910/variable-set-in-ng-repeat-not-being-created