angular.js - Value update issue in view in angularjs

Question

SolarTerms.controller('FooterCtrl', ['$state', '$rootScope', '$scope', function ($state, $rootScope, $scope) {

$scope.imgsrc = {
    "imda1":"img/icon1.png",
    "imda2":"img/icon2.png",
    "imda3":"img/icon3.png",
    "imda4":"img/icon4.png",
    "imda5":"img/icon5.png"
}

}])

SolarTerms.directive("tabImg",function () {

    return {
        restrict:'A',
        scope:false,
        link:function (scope,ele,attr,ctrl) {
            ele.bind('click',function (event) {
                var index = $(this).index();
                scope.imgsrc = {
                    "imda1":"img/icon1.png",
                    "imda2":"img/icon2.png",
                    "imda3":"img/icon3.png",
                    "imda4":"img/icon4.png",
                    "imda5":"img/icon5.png"
                };
                scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png';
                //scope.$apply(scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png')
            })
        }
    }
})

<p tab-img class="I_AF_p" ng-click="goto('index')"><img ng-src="{{imgsrc.imda1}}" alt=""> <span>Homepage</span></p>
<p tab-img class="I_AF_p" ng-click="goto('ye')"><img ng-src= "{{imgsrc.imda2}}" alt=""><span>Balance</span></p>
<p tab-img class="I_AF_p" ng-click="goto ('js')"><img ng-src="{{imgsrc.imda3}}" alt=""><span>Calculate</span></p>
< p tab-img class="I_AF_p" ng-click="goto('ck')"><img ng-src="{{imgsrc.imda4}}" alt=""><span>View </span></p>
<p tab-img class="I_AF_p" ng-click="goto('wd')"><img ng-src="{{imgsrc. imda5}}" alt=""><span>Documentation</span></p>

Get the index after clicking the corresponding p, and then change the corresponding value in $scope.imgsrc. The console can correctly output the image address, but why does the value in ng-src in the view need to be clicked twice to change? I just want to Change the image address in ng-src. I just started learning angularjs. Can someone explain it to me? Thank you.

Answer 1

You need to manually trigger angular’s ​​rendering mechanism

 link:function (scope,ele,attr,ctrl, $timeout) {
            ele.bind('click',function (event) {
                var index = $(this).index();
                scope.imgsrc = {
                    "imda1":"img/icon1.png",
                    "imda2":"img/icon2.png",
                    "imda3":"img/icon3.png",
                    "imda4":"img/icon4.png",
                    "imda5":"img/icon5.png"
                };
                
                $timeout(function() {
                    scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png';
                    //scope.$apply(scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png')
                })
                
            })
        }