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来源：蜘蛛抓取(WebSpider) 时间：2016-09-28 01:21 标签： ng4j2j a
angularjs - How can I use the $index inside a ng-repeat to enable a class and show a DIV? - Stack Overflow
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I have a set of &li& elements.
&li ng-class="{current: selected == 100}"&
&a href ng:click="selected=100"&ABC&/a&
&li ng-class="{current: selected == 101}"&
&a href ng:click="selected=101"&DEF&/a&
&li ng-class="{current: selected == $index }"
ng-repeat="x in [4,5,6,7]"&
&a href ng:click="selected=$index"&A{{$index}}&/a&
When a user clicks on one of the address elements above then then it should, set the value of selected and show one of the &DIV& elements below:
ng:show="selected == 100"&100&/div&
ng:show="selected == 101"&101&/div&
&div ng-repeat="x in [4,5,6,7]" ng:show="selected == $index"&{{ $index }}&/div&
This works for the first two cases.
When the user clicks ABC then the first &DIV& shows 100 and changes color to red.
When DEF is clicked then 101 shows and DEF changes to red.
However it does not work at all for A0, A1, A2 and A3
When a user clicks A0, A1, A2 or A3 then the correct
does not show, the selected value is not set and the color of ALL the ng-repeat A0,A1,A2 and A3 turn to red.
This is best shown if you look at this Plunker:
Note that at the top I have added {{ selected }} as a debug aid at the top. Also the x in [4,5,6,7] are just meant to simulate a loop. In real life I have this as ng-repeat="answer in modal.data.answers".
Does anyone know how I can set this up so that the li class current is set at the right time and the DIV shows at the right time for the A0, A1, A2 and A3 &li& and &DIV&
3,96636105177
The issue here is that ng-repeat creates its own scope, so when you do selected=$index it creates a new a selected property in that scope rather than altering the existing one. To fix this you have two options:
Change the selected property to a non-primitive (ie object or array, which makes javascript look up the prototype chain) then set a value on that:
$scope.selected = {value: 0};
&a ng-click="selected.value = $index"&A{{$index}}&/a&
Use the $parent variable to access the correct property. Though less recommended as it increases coupling between scopes
&a ng-click="$parent.selected = $index"&A{{$index}}&/a&
5,63411625
As johnnyynnoj mentioned ng-repeat creates a new scope. I would in fact use a function to set the value. See
$scope.setSelected = function(selected) {
$scope.selected =
{{ selected }}
&li ng-class="{current: selected == 100}"&
&a href ng:click="setSelected(100)"&ABC&/a&
&li ng-class="{current: selected == 101}"&
&a href ng:click="setSelected(101)"&DEF&/a&
&li ng-class="{current: selected == $index }"
ng-repeat="x in [4,5,6,7]"&
&a href ng:click="setSelected($index)"&A{{$index}}&/a&
ng:show="selected == 100"&
ng:show="selected == 101"&
&div ng-repeat="x in [4,5,6,7]"
ng:show="selected == $index"&
{{ $index }}
17.9k104653
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