This guideline never refreshes the information it contains

I'm currently working on a directive that needs to reload its content automatically. Unfortunately, I haven't had much success with it so far. Any assistance would be greatly appreciated.

UPDATE: I attempted the suggested solution but encountered a $digestx10 error. It seems like the problem persists.

Although everything is functioning correctly and the data is being saved properly, the DOM refuses to refresh.

angular.module('mymodule').directive('chatContent',
    ["$compile",'localStorageService','loginService','peopleOnlineService', 
    function($compile, localStorageService, loginService, peopleOnlineService) {


var LoadData = function (data, userId) {
    var template = '';

    if(localStorageService.IsUser(userId) === true){
       template = '<div class="feedItemChat"><div class="chatItem"><div class="chatMessage userChatMessage">{{content.chatMessage}}</div></div></div>';
    }else{
       template = '<div class="feedItemChat"><div class="chatItem"><div class="chatMessage otherChatMessage">{{content.chatMessage}}</div></div></div>';
    }
    return template;
};

var linker = function (scope, element) {

    var data = localStorageService.LoadDataLocal(localStorageService.CheckCorrectRoom(loginService.GetUser().userId, peopleOnlineService.GetParams().userId));

    scope.$watch(data, function(){
        element.html(LoadData(data,scope.content.userId)).show();
        $compile(element.contents())(scope);
    });
};

return {
    restrict: 'E',
    link: linker,
    scope: {
        content: '='
    }
};
}]);

I'm also curious about how one could incorporate HTML templates in this code instead of using lengthy strings.

Answer №1

Keep in mind that I might be missing something as a beginner...

It seems like you might be trying to fix this issue in the wrong place. Is scope.content (in the outer scope) being initialized outside of the Angular framework? If so, consider wrapping scope.content =... in a $scope.$apply() to ensure the framework detects any changes.

You may not even need a $watch in this situation. $watch is typically used when the change you are looking for is not directly related to what is displayed in the view. Every {{expression}} automatically creates a watch for that specific expression.

One approach could be to use a single template in your directive and define a "chatMessageClass" scope variable that can be incorporated into an ng-class='...' statement within the template.

This method helps reduce unnecessary work for both you and the browser. Unless there are hidden side effects in the code, this simplifies everything.

var linker = function (scope, element) {
    scope.chatMessageClass = localStorageService.IsUser(scope.content.userId) ? 
        'userChatMessage' : 'otherChatMessage';
};

Here are some helpful references: https://docs.angularjs.org/api/ng/directive/ngClass https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$apply

Answer №2

Important Note: I am focusing on correcting the $watch setup rather than addressing the issue of DOM regeneration. To resolve the digest problem, consider using a standard directive with a template attribute, as recommended by Petr Averyanov.

Here is an example:

var data = localStorageService.LoadDataLocal(localStorageService.CheckCorrectRoom(loginService.GetUser().userId, peopleOnlineService.GetParams().userId));

scope.$watch(data, function(){
    /* ... */
});

Instead, you can try this approach:

scope.$watch(
    function(){
        return localStorageService.LoadDataLocal(localStorageService.CheckCorrectRoom(loginService.GetUser().userId, peopleOnlineService.GetParams().userId));
    }, 
    function(newData){
        /* This code will be executed when LoadDataLocal returns a different value */
    });

(Please note that I have removed the data variable and utilized the $watch newValue directly within LoadData.)

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