Articles

The direction of embedded text and how to verify what’s contains string

When you are working on internationalization of HTML inline element then you can use dir attribute or you may use special Unicode characters to achieve multiple embedded direction changes. However, sometimes there could be a bugs in your translated strings and when you use Unicode characters then debugging is little bit tricky. You may think that maybe your code is somewhere broken.

To illustrate the problem let’s say you have a string that is encoded in ar-SA (Arabic (Saudi Arabia)) language, but for some unknown reason one of character (pa[……]

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contenteditable and prevent from going to new line using ENTER key

Let’s say we have a simple div HTML element with attribute contenteditable. Sometimes we want to observe ENTER key and prevent cursor to go to new line when user hit ENTER key without SHIFT key. To do this you can use event onkeyup. See example how it works.

And? Yeah, the cursor is going to new line when you hit ENTER key. It’s relatively quick, but it’s still visible behavior. This is not exactly what we expecting. We do not what to move cursor to new line when user hit ENTER key without SHIFT key. Ok, why this happen?

It happens becau[……]

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How to override compatibility mode for intranet site when “Display intranet sites in Compatibility View” is checked?

Based on some research in internet I found that we can use HTML meta tag:

meta http-equiv="X-UA-Compatible" content="IE=edge"

to force IE to use highest supported document mode of the browser. Note: more about X-UA-Compatible you can find in MSDN documentation.

However, based on discussion in group Internet Explorer Dev Center looks like it’s better to send header X-UA-Compatible in server response. Cite:

The only way I found to override the “Display intranet sites in Compatibility View” setting was by setting the X-UA-Compatible host[……]

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VirtualBox: Installation failed! Error: System can not find the path specified.

I’ve just discovered today that I couldn’t install new version of VirtualBox due to problem with Installation failed! Error: System can not find the path specified.. After some investigation here is the solution:

  1. Open command line cmd
  2. Go to the directory where is your VirtualBox installation file. Mine installation file is (at the moment) VirtualBox-4.3.4-91027-Win.exe
  3. Run VirtualBox-4.3.4-91027-Win.exe -extract . It will extract files to directory C:\users\USERNAME\AppData\Local\Temp\VirtualBox or to your defined TEMP directory
  4. Above l[……]

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Modal windows – are they always necessary?

I do not want to write about “what is modal windows”, but focus on potential problems which may occur when you start using modal windows in some scenarios. More about modal windows you can find in article Techniques for creating modal windows.

Example:

Screenshot of My Library modal window example
Source: Screenshot of My Library modal window example

Before you create modal windows everywhere consider:

  • Provide “resize option. Otherwise customer will not be able to resize the modal window and probably some content may not be visible e.g. when user will set font size bigger.
  • [……]

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JS Tip: How to check if specified HTML element is supported by the browser

To check if browser support specified HTML element you can use:

function isHTMLElementSupported(elm) {
    return (Object.prototype.toString.call(document.createElement(elm)) !== '[object HTMLUnknownElement]');
};

Object.prototype.toString returns the value of the object’s internal [[Class]] property.

Every object has a toString() method that is automatically called when the object is to be represented as a text value or when an object is referred to in a manner in which a string is expected. By default, the toString() method is inherit[……]

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How to check if browser supports cookies using client-side technique

Introduction

There is at least (which I know) two methods to find out if cookies are enabled or not. You can use client-side script techniques or server-side techniques. Here I will present client-side technique.

To check if browser supports cookies I’ll create some methods for set, get and enabled and use Navigator.cookieEnabled. Now I will do 2 steps:

  • use window.navigator.cookieEnabled which returns a Boolean value that indicating whether cookies are enabled or not (read-only).
  • or try to set test cookie (if Navigator.cookieEnabl[......]

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Simple date picker

Basic information’s

I’ve created simple date picker using just JavaScript and CSS. Yes, there is a lot of date pickers, but not like this one 😀 Anyway, my goal was to build date picker which will be:

  • independent of any 3rd party libraries
  • working with keyboard navigation
  • working with screen readers
  • fast and as much as possible small file size
  • simple to implement
  • cross-browser
  • passing JSLint in case of JavaScript code

The first, basic version of datepicker you can see and download at my lab section. There is still some l[……]

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Simple technique to preload images at specified moment

There are many ways to preload images, including methods that rely on CSS, JavaScript, and various combinations thereof. Here I would like to present some of my favorite technique which can be used for preloading images.

Why preloading?

Preloading images can be useful when you need resources without waiting for download them. However, while technique for preloading is important then sometimes is more important when you do this.

Disadvantages

Preloading is useful. However, there is a problems which could affect on overall performance[……]

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JS tip: always use full reference

Let’s say we have an example of code like this:

(function(){

    function close_window() {
        if (typeof self.close === 'function') {
            self.close();
        }
    }
    // and somewhere in the code above method is called many times

    function some_action() {
        // here some code
        close_window();
    }

}());

Note: method close_window could be written in a better way, but in that case I wanted to show just a simple example.

Some time later someone did more changes and then after all the code[……]

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