How to implement color change in Angular

This article mainly introduces the core code of clicking the li tag in Angular to change the color. Friends who need it can refer to

Click the li tag after ng-repeat traversal to change the border color;

html code:

<ul ng-if="params.questionTypeId == 8">
<li class="gamePre-def" ng-repeat=" word in wordsDef" ng-click=&#39;li_click($index)&#39;
ng-class=&#39;{focus: $index == focus}&#39;> {{word}}</li>
</ul>

js code:

$scope.li_click = function (i) {
$scope.focus = i;
};

Description:

① In the click event of the element, the "li_click()" method added in the $scope object will be executed;

② In this method, "$index (line number value)" will be executed Pass it to the method as an actual parameter, and set the "focus" attribute value to the "$index" value;

③So when a row element is clicked, the "focus" attribute value will change is the corresponding "$index";

④At this time, the "ng-class" style instruction of the

element specifies the style that needs to be added to the element through the key/value object. element, the "$index" variable value is the same as the "focus" attribute value, which means that the return value of "$index==focus" is true;

⑤You should understand at this time Now, the style instruction value of "ng-class" changes to "focus";

⑥After the above analysis and operation, we have achieved the effect of adding a border when clicking the element.

css style:

ul .focus {
border: 1px solid blue;
}

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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