I want to crawl my SPA built by the Vue framework (Relatively same as React framework). However, I see that the content is not rendered while crawling. The result is:
<!doctype html>
<HTML>
<body>
<div id=app>
</div>
<script type=text/javascript src=/static/js/manifest.2ae2e69a05c33dfc65f8.js></script>
<script type=text/javascript src=/static/js/vendor.60c471696de493d48a1c.js></script>
<script type=text/javascript src=/static/js/app.335a9e9866cb7dc6a517.js></script>
</body>
</html>
Are the component-based javascript frameworks anti crawling? How can I make the component to be rendered by the crawler?
I'm using Abot framework for crawling propose
All Abot does is send a request to the target website, parse the data, and pass it back to you. As you probably know, frameworks like React or Vue are 100% JavaScript based, meaning no data will be rendered unless you run the JavaScript. So the solution here is to launch a headless browser or another DOM engine and scrape the data.
Several engines you could use are Selenium (browser automation framework available in Python and some other languages), Puppeteer (Chromium-based web-scraper in NodeJS), or a DOM engine like JSDOM.
Moral of the story is: if you want to see result rendered by JavaScript you must execute the JavaScript inside a DOM.
So I got to know about this method recently but I'am unable to understand that where do I use this method and is it necessary to use this method?
You don't need to use it if you don't mind about Server-Side Rendering(SSR).
There are 2 types of rendering Client-Side Rendering and SSR.
You can tell that a site uses SSR when you request a page using postman say for example http://youtube.com, the server returns the html markup together with dynamic data from the backend. It is very crucial for SEO purposes to allow bots to crawl your app. It also improves performance of your site by First Contentful Paint(FCP) and Time to Interactive (TTI) metrics.
rendertoString method is used in the server side to convert a react component instance into a HTML string.
On the other side, CSR just returns this markup from the server.
<html>
<head>
<!-- More tags here -->
</head>
<body>
<div id="root"></div>
<script src='/bundle.js'></script>
</body>
</html>
Most of the react-apps like create-react-app are client-side rendered. The markup with dynamic data is rendered by the browser.
In Notepad++ tools Angular Routing does not working.
I Tried to Link all angular links
Scotch Tutorials
Above Tutorial Link Working in Online,But does not working in Notepad++.
From the comments you've provided it's because you've used;
<body ng-controller="mainController">
You need to specify the angular App instead like so;
<body ng-app="scotchApp">
This makes sure your index page uses the module App, rather than explicitly the controller.
Hope it helps!
I am new to AngularJS, was trying to have common header part for entire project. I could not find any solution yet.
I have following header.html to be included all inner page.
<html>
<head>
<link href="..." ...>
<script src="angular.js" type="text/javascript"></script>
</head>
<body>
I used to include above part in any page by using server side. I am wondering if there anything in angularjs available so that I can continue with simple html pages instead of making it server side pages.
I am aware of directives in angularjs but, it needs all above includes already in page to get it worked, so only after <body> tag only it is usable. Anything before <body> tag cannot be made as common by using directive...
Any help would be great...
I am looking for some guidance with creating an AngularJs multi-page app served by a Laravel Backend. All web app tutorials on the net point to creating SPAs and I am just getting started with Angular - so please go easy on me.
ProductPage example - http://example.com/products/widget
<html data-ng-app='ExampleApp'>
<head>
</head>
<body data-ng-controller='ProductController'>
// ProductPage Content Served by laravel with angular tags
<script type="text/javascript" src="/js/lib/angular.min.js"></script>
<script type="text/javascript" src="/js/app.js"></script>
<script type="text/javascript" src="/js/controllers/ProductController.js"></script>
</body>
</html>
CartPage Example - http://example.com/cart
<html>
<head>
</head>
<body data-ng-controller='CartController'>
// CartPage Content Served by web-server with angular tags
<script type="text/javascript" src="/js/lib/angular.min.js"></script>
<script type="text/javascript" src="/js/app.js"></script>
<script type="text/javascript" src="/js/controllers/CartController.js"></script>
</body>
</html>
So in the above examples, I have created two pages, which are served by the web server with pretty much all static content. But the pages have been marked up with angular tags. On each static page, I have referenced a different AngularJS controller.
Is this the right way of tackling the problem or should I be allowing app.js to load up the controllers / inject the dependencies?
Also, any guidance on sharing data between controllers in this multi-page app and links to decent resources / examples would be really helpful. e.g Would I need to pass e.g. Items added to shopping cart to an api from the product page, then query this api again to retrieve the cart contents?
You should include the ngRoute module and let AngularJS load the controllers for you. Please refer to AngularJS docs to find out how to work with routings.
As for sharing data between controllers, services are what you're looking for. Creating a service is as easy as this:
app.factory("ServiceName", [function() {
return {
somevar: "foo"
};
}]);
Then, in your controllers, you inject the service like this:
app.controller("ContactCtrl", ["$scope", "ServiceName", function($scope, svc) {
$scope.somevar = svc.somevar;
}]);
The service's state is retained for as long as you don't cause a physical page reload (which is why you should use ngRoute to load your controllers).
Here you can use ngroute directive with assigning controller name dynamically.
If we use ngroute , then ngroute $scope is parent scope for both pages(html views).
Form this scope you can easily pass data from one controller to other controller.
Probably the best boilerplate/template system that I have found is Yeoman. It has a large number of great Angular templates that you can use as a starting point, and also supports automatically creating models, views, etc. from subtemplates of the main template that you choose.
Take a look at the Yeoman Angular generator, it's one of the more well-maintained angular templates that will give you a good feel for the capabilities of using a Yeoman generator.
I've worked with ngSeed for the past two years now. When it got updated to use $state it felt like a decent way to do larger apps with Angular.
Things to remember:
modularize around functionals (not layers like most tutorials do),
keep your modules small and clean,
never use $rootScope,
encapsulate shared state in a service,
don't broadcast events, but watch state,
…
Check out fountainjs. They have good boilerplates for different UI technologies.
I put a basic angular multipage boilerplate on github. It covers a working example of ngRoute and the loading of html partials and images. There's also an angular button in one of the partials that logs a message to the console. Hope it helps
https://github.com/PrimeLens/angular-multipage-boilerplate
edit: there is a controller that encompasses all pages to hold data that you might want to pass from page to page.