Click event inside a repeat loop

Working with AngularJS, I have a collection of colors that each have a specific title and type. These colors are displayed in a list format on the webpage.

Now, I am looking to enhance this by incorporating a menu option that allows users to filter and view only the colors belonging to a certain type. To achieve this, I have created another array containing different color types which is also presented as a list.

The goal is to enable users to click on a particular colortype and dynamically filter the displayed colors based on the selected color.type. This can be accomplished using a filtering mechanism:

<ul>
    <li ng-repeat="color in colors | filter:search">
        {{ color.title }}
    </li>
</ul>

When manually inputting a list of colortypes, everything functions correctly:

<ul>
    <li>
        <a href="" ng-click="search.type = 'primary';">
            Primary
        </a>
    </li>               
</ul>

However, when attempting to utilize an array of colortypes as outlined above, clicking on an item yields no result:

<ul>
    <li ng-repeat="colortype in colortypes">
        <a href="" ng-click="search.type = '{{ colortype.title }}';">
            {{ colortype.title }}
        </a>
    </li>               
</ul>

This issue may stem from the placement of ng-click within ng-repeat (or possibly due to scope constraints related to the = operator). How can this problem be resolved?

Answer №1

When using the ngClick directive, you need to provide an expression, not just JavaScript code.

For example,

<a href="" ng-click="search.type = colortype.title">
will work without the need for interpolation using {{}}.

Answer №2

When using ng-repeat, child scopes are created, causing ng-click to reference the child scope rather than the controller's scope. To address this issue, here are two different approaches you can take.

1) One quick solution is to access the parent scope using $parent.

Modify your ng-click like so:

<a href="#" ng-click="$parent.search.type = colortype.title;">
    {{ colortype.title }}
</a>

View $parent solution on JSFiddle

If the template becomes more deeply nested, the above approach may become cumbersome as you would need to include additional $parent.$parent... references.

2) Alternatively, a better strategy is to create a function on the controller's scope that returns a reference to the scope. Due to prototypal inheritance, you can access the controller scope functions from the child scope.

function ColorCtrl($scope) {      
    $scope.getColorCtrlScope = function() {
         return $scope;   
    }
    .....
 <a href="#" ng-click="getColorCtrlScope().search.type = colortype.title;">
     {{ colortype.title }}
 </a>

See improved solution on JSFiddle

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