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Link Preview

How this works

The algorithm keeps tracking what you are typing in the status field and through regular expressions identifies a url. Thereafter, the text is in the field is passed to PHP that does all the work to analyze all the source code of the url found. If you enter more than one url, it will consider that the first one is the more relevant and it will create a preview. Once the source code of the url is obtained, regular expressions begin to seek out and capture relevant information on it. This information is basically the title page, the images contained therein, and a brief description of the content covered in the page.

Right Left
Preview Left
Bottom Top
Bottom Top
Gallery Video
Preview Gallery Preview Video


HTTP Server

  • Apache (must support mod_php)

How to add it to your project

1 • Stylesheets

	<link href="" rel="stylesheet">
	<link rel="stylesheet" href="">
	<link rel="stylesheet" type="text/css" href="src/link-preview/css/link-preview.css" />

2 • Scripts

	<script src="" type="text/javascript"></script>
	<script src=""></script>
	<script src="" type="text/javascript"></script>
	<script src="src/link-preview/js/link-preview.js" type="text/javascript"></script>
    <!-- Include this script below if you want to retrieve the posts inserted to database -->
    <script src="src/link-preview/js/link-preview-database.js" type="text/javascript"></script>

3 • Configuration

Add the link preview module as a dependency to your application module:

	var app = angular.module('App', ['linkpreview'])

Add the directive inside your controller html:

	<link-preview placeholder="What's in your mind?" />


att var default value possible values
type type right right, left, bottom, top (text position)
amount imageAmount -1 any integer
btext buttonText Post any string
bclass buttonClass primary default, primary, success, info, warning, danger, link
cbtext cancelButtonText Cancel any string
cbclass cancelButtonClass danger default, primary, success, info, warning, danger, link
ltext loadingText Loading any string
limage loadingImage empty.png any image url
placeholder placeholder an empty string any string
ttext thumbnailText Choose a thumbnail any string
nttext noThumbnailText No thumbnail any string
tpage thumbnailPagination %N of %N any string, %N is the number reference of pagination
dtitle defaultTitle Enter a title any string
ddescription defaultDescription Enter a description any string
			ddescription="" />

4 • Database

To custom your database configurations, you need to change the following values in Database.php

		$host = "localhost";
        $user = "";
        $password = "";
        $database = "linkpreview";

Additionally, the way I used to retrieve the data was creating a controller link-preview-database.js which you can include the file somehow in your project or you can its content to yours.

	app.controller('MyControllerDatabase', ['$scope', '$http', function ($scope, $http) {
        $scope.databasePosts = [];
            $scope.retrieveFromDatabase = function () {
                // You must insert in your page a div with the posts retrieved from database. Just like the posts div
                // on template html files
                var url = 'src/link-preview/php/retrieve.php';
                    url: url,
                    method: "GET",
                    headers: {'Content-Type': 'application/x-www-form-urlencoded'}
                }).success(function (data, status, headers, config) {
                    for (var i = 0; i < data.length; i++) {
                        data[i].video = data[i].videoIframe !== "";
                        data[i].showIframe = false;
                        data[i].textHTML = $sce.trustAsHtml(data[i].text);
                        data[i].descriptionHTML = $sce.trustAsHtml(data[i].description);
                        data[i].videoIframeHTML = $sce.trustAsHtml(data[i].videoIframe);
                    $scope.databasePosts = data;
            $scope.deletePosted = function (post, $index) {
                $scope.posts.splice($index, 1);
            $scope.imageAction = function (post) {
                if ( == false) {
          , '_blank');
                } else {
                    post.showIframe = true;
            $scope.hidePlay = function (post) {
                return == false || post.showIframe == true;
            $scope.layoutWithoutImage = function (post) {
                return post.image == '' || post.showIframe == true;
            $scope.layoutWithImage = function (post) {
                return post.image != '' || ( == true && post.showIframe == false);


Also, check the file database-template.php to see an example of how to display the data retrieved from database.

Make sure your columns are the same as those ones in linkpreview.sql or customize them.

Result Format

	   "url":"original url",
	   "pageUrl":"page url",
	   "canonicalUrl":"canonical url",
	   "images": ["array of images"],
	   "image": "first image of images",
	   "videoIframe":"video iframe, if it is a video"


Make sure the library php5-curl is installed and enabled on the server, either locally or remotely.

  • Linux
$ sudo apt-get install php5-curl
$ sudo service apache2 restart
$ sudo port install php5-curl 
$ sudo apachectl restart

Also where there is 'src/link-preview/' as part of a path of a Javascript, CSS or image file, you must change to the path on your server.

Information and Contact

Developed by @LeonardoCardoso.

Contact me either by Twitter @leocardz or emailing me to

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