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Showing posts from 2013

MongoDB: Getting Started With CRUD Operations

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MongoDB is No-Sql Open Source database system which uses document as record of database. MongoDB is designed for high performance and high accessibility.   Document is set of field => value pair combination and store this information in form of BSON ( BSON is binary representation of JSON records) which is native data type in most of languages. MongoDB store set of documents in the form of collection. Now let’s see the basic operations which can be handled in MongoDB.           Create           Read           Update          Delete Collectively called CRUD operation Create Operation MongoDB perform atomic create operation on single document. It adds new document to selected collection.  db.{collection_name}.insert({                  field => value,                  field => value,                  field => value, }); Here value could be simple datatype or complex (document or array) Create operation always add unique iden

How To Watermark A Photo Using PHP

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Hello Friends, This blog post will help you to create a watermark image using PHP. But first let’s get introduce yourself with watermarking. What is Watermark? Watermark is a marker which is embedded inside image (other media). It is use to identify the ownership. Why we need Watermarking? Watermarking helps to maintain integrity   and avoid unauthorized use for images (other media source also). For example let’s suppose you are have image hosting website and you provide unique and beautiful images to user. If you want only authorize user should download your images then you need to provide image preview with watermarking and original image to authorized user only so that unauthorized user cannot misuse it. Now let look at some coding stuff. First example shows watermarking images with text, normally we use copyright text. And second example show watermarking with watermark image. Watermarking using text // set water mark text $watermark = 'wate

JavaScript : Flash Title For New Message

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Whenever you chat with your friends on Facebook or Gmail, you often see new blinking message which appears on Title of browser when you’re on other webpage or tab. I always feel how they would notify us with this message. After some research I found that it is a small JavaScript which makes this happen. This tutorial post will help you to flash Title of web browser for new message. Let’s look at some JavaScript stuff var message_interval = null; var user = 'Zainul'; var message = 'Hello There'; var odd_even = 0; var old_title = document.title; /** * Show title message when new message arrives */ function showTitleMessage() { // set time interval message_interval = setInterval(function() { // reset title and execute next task when user returs to this tab $(window).bind('focus', function() { clearInterval(message_interval); document.

CSS: How To Create Custom Scrollbar For Webkit Supported Browsers

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One of eye catching thing of Gmail new updates was its scrollbar. First I thought it would be an html element represented by some kind of Javascript. But after some time I realized that it was not Javascript effect rather it is a CSS effects for scrollbars. One amazing thing about this scrollbars are, they can be represented in different style for different HTML elements within same webpage. Today we will see the implementation of such scrollbar for Webkit supported browsers. First we will look at basic CSS properties of scrollbar. ::-webkit-scrollbar              ::-webkit-scrollbar-thumb        ::-webkit-scrollbar-track        ::-webkit-scrollbar-button       ::-webkit-scrollbar-track-piece  ::-webkit-scrollbar-corner       ::-webkit-resizer Following image shows location these properties within scrollbar. Now let’s look at the one basic example body{ min-height: 1000px; } ::-webkit-scroll

Preload Images Using Javascript

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Preload Image is technique which helps browser to render images with minimum delay. Today we will see example of image gallery. Gallery contain 5 images which load images one after another whenever user clicks next and back button. This is a basic image gallery scenario which is used in all possible website, then why we need preloaded images for this gallery? Now a day’s most of website becoming faster and user expectation is increasing. Suppose your website doesn’t use preload image technique for gallery and a user visits any image gallery from Google Plus or Facebook and visits your website gallery. Then that user always prefer those websites rather than yours. Why? Because your website load one image at a time. When user click on next button, then only gallery load image and user has wait till it get loaded. To avoid this situation gallery needs to download all images

How To Implement Review Rich Snippet

Rich snippet helps to create more interactive appearance of your webpage in SERP . There are different sets of Rich snippet which are approved by Google. Today we will see the how to implement Review – Rich snippet . Schema.org provides vocabulary to create snippet that SERP page shows result with additional information like ratings, review count, description. Let’s implement this snippet. Here is sample example without snippet. Basho’s is one of the best restaurant in Pune - by Zainul, October 1, 2013 4/5 stars Very nice ambiance, food & service. ...! Now we will add Shema.org vocabulary for this page. <div itemprop = "review" itemscope itemtype = "http://schema.org/Review" >     <span itemprop = "name" > Basho’s is one of the best restaurant in Pune </span> -     by <span itemprop = "author" > Zainul </span> ,     <div itemprop = "reviewRating" itemscope

Twitter: How To Implement Summary Card

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Hello Friends, this tutorial will help you to implement one of the Twitter card, Summary Card. There are different cards available in Twitter. like Summary Photo Product Gallery App Player Today we will see implementation of Summary Card. Summary card gives preview of website to reader which get shared via twitter. It is a rich snippet which display Title, Description and Image of shared website.  To use summary card you need to add few meta tags in your webpage. Follow the given step to get these meta tags 1.     Visit following link https://dev.twitter.com/docs/cards/validation/validator 2.   Choose Twitter Card, which is   Summary . 3.   Add meta information  twitter:site   (Site Twitter Username) twitter:title   (Site/Webpage Title) twitter:description   (Site/Webpage Description) twitter:creator   (Site Twitter Creator) twitter:image:src   (Site/Webpage Image) twitter:domain   (Site Domain)   4.   Then select sample

jQuery: How To Make Your Image based Website Load Faster

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Hello Friends, Today I am writing my second tutorial post regarding optimization of webpage which contains bulks of images. Let’s consider one scenario where you want to display hundreds of images at a time. And also your client wants this webpage should load faster. Now here is the problem, webpage won’t get loaded fully unless all of its images get download first. Which means as number of images in webpage increases the load time of that webpage also increased. To solve this problem we must reduce the webpage load time, indirectly it means that we need to load less amount of images. Consider a scenario where we load only one default image at each place of actual images indicating that these actual images are getting downloaded and using Javascript we will download these actual images after window finishes its loading. Following diagrams will help you to understand the flow. as one image wont takes too much time to load, therefore webpage speed inc

AJAX - How To Retrieve JSON Response from PHP script

Hello Friends, This is my first tutorial post. Today I'll explain you how to retrieve JSON response via Ajax call. First we build a PHP script to send response in JSON format, then we will gather this response from an Ajax call through jQuery script. Let’s first create a PHP script  Create a PHP script, I’ll name it as “json_response.php” And add following code in it json_response.php <?php //set header for JSON response header("Content-Type: application/json"); //render array in JSON format echo json_encode(array('status' => 200, 'message' => 'Response from PHP script in JSON format.')); This is a basic example to send JSON response. PHP script will send response with status code and message. Now create a HTML file to fetch JSON response and add it in header tag. Create a HTML file, I’ll name it as “json_response.html” And add following code. json_response.html <html>