When using UI-Router (angular-ui-router), you may encounter issues where the expected view does not load properly. This can happen due to missing dependencies, incorrect configuration, or template path issues.
1️⃣ Common Causes of the Issue
Cause 1: angular-ui-router Not Included
If the UI-Router library is missing, the router won’t work.
Cause 2: ui-router Not Injected into the Module
Your module must include "ui.router" as a dependency.
Cause 3: Incorrect stateProvider Configuration
If there’s a typo or missing details in the stateProvider setup, the view won’t load.
Cause 4: Template URL Issue
Wrong file paths or template locations can cause the view to fail to load.
Cause 5: <ui-view> Not Placed in index.html
The ui-view directive must be in your HTML where you want the view to load.
2️⃣ Solutions to Fix ui-router Not Loading Expected View
Solution 1: Include angular-ui-router.js
Ensure that angular-ui-router.js is loaded before your AngularJS app.
Using a CDN (Recommended)
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.2/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/1.0.3/angular-ui-router.min.js"></script>
Using Local Files
If you have downloaded UI-Router, include:
<script src="libs/angular.min.js"></script>
<script src="libs/angular-ui-router.min.js"></script>
Make sure UI-Router is loaded before your AngularJS app script.
Solution 2: Inject ui.router into Your App
Ensure your AngularJS module includes "ui.router":
var app = angular.module("myApp", ["ui.router"]);
Without this, UI-Router will not function.
Solution 3: Correctly Configure $stateProvider
Instead of $routeProvider, UI-Router uses $stateProvider. Check your app configuration:
app.config(function($stateProvider, $urlRouterProvider) {
$urlRouterProvider.otherwise("/home"); // Redirect to /home if route is not found
$stateProvider
.state("home", {
url: "/home",
templateUrl: "views/home.html",
controller: "HomeController"
})
.state("about", {
url: "/about",
templateUrl: "views/about.html",
controller: "AboutController"
});
});
Make sure each state has a valid url, templateUrl, and controller.
Solution 4: Ensure <ui-view> is in Your index.html
UI-Router needs a ui-view directive to load templates dynamically.
Example index.html
<!DOCTYPE html>
<html lang="en" ng-app="myApp">
<head>
<title>UI-Router Example</title>
</head>
<body>
<nav>
<a ui-sref="home">Home</a>
<a ui-sref="about">About</a>
</nav>
<div ui-view></div> <!-- This is where views will load -->
<script src="angular.min.js"></script>
<script src="angular-ui-router.min.js"></script>
<script src="app.js"></script>
</body>
</html>
Without <ui-view>, UI-Router cannot inject views.
Solution 5: Check Template Paths
Make sure your template files exist and are accessible.
Wrong path (causing 404 error):
templateUrl: "home.html" // Incorrect if home.html is in /views/
Correct path (if using /views/ directory):
templateUrl: "views/home.html"
Use the correct relative paths for your templates.
Solution 6: Debug with $stateChangeError
If views are still not loading, log state change errors:
app.run(function($rootScope) {
$rootScope.$on("$stateChangeError", function(event, toState, toParams, fromState, fromParams, error) {
console.error("State Change Error:", error);
});
});
This will show errors in the console when state changes fail.