Avivo Tech Blog » html

Very cool! Create TRIANGLE in HTML with CSS

Avivo — Wed, 31 Aug 2011 10:46:55 +0000

Triangle in pure HTML/CSS

Infinity in pure HTML/CSS

So, this is the CSS for triangle:

.triangle {
    border-bottom: 100px solid #FC2E5A;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    height: 0;
    width: 0;
}

All other custom shapes!

Preloading images with JavaScript (JQuery) and JQuery cool animations and effects

Avivo — Wed, 12 Jan 2011 16:29:02 +0000

Model 1:

Use function to replaceImage:

function replaceImage(img, replacementImage)
{
  img.onload = null;
  img.src = replacementImage;
}

blank.gif is an 1px x 1px pixel transparent image. Basically, the idea is that this blank image is loaded and expanded to 75×75 (to preserve layout). That almost immediately fires the onload handler, which changes the image’s source to the desired image.

Model 2:

var img = new Image();
img.onError = function(){
  //error handling here
}
img.onLoad = function(){
  //success
containerForImg.removeClass('loading-image').append($(img));
}
img.onAbort = function(){
  //user clicked stop
}
img.src = "http://example.com"   //loading begins NOW!

References:

http://goo.by/wE3TFa
http://goo.by/w7AjZN
http://goo.by/w0CsbA

Background image animations:

$('#nav a')
.css( {backgroundPosition: "0 0"} )
.mouseover(function(){
$(this).stop().animate(
{backgroundPosition:"(0 -250px)"},
{duration:500})
})
.mouseout(function(){
$(this).stop().animate(
{backgroundPosition:"(0 0)"},
{duration:500})
})

How to trim leading and trailing HTML spaces in C#

developer — Mon, 13 Dec 2010 12:27:52 +0000

Some HTML WYSIWYG editors create ‘br’ tags or leave ‘ ’ garbage spaces when no content is entered. Described TrimWhiteSpaces method is useful when you need to determine if user left blank content in WYSIWYG editor or if you just want to clean HTML code.

TrimWhiteSpaces accepts raw HTML content and removes white spaces, tabs, new line characters, ‘br’ tags and ‘ ’ chunks from before and after the actual content.

public static string TrimWhiteSpaces(string html)
{
  string result = html;

  //Remove leading spaces
  result = Regex.Replace(result, @"^(?(\s|\r|\n|\| )*)", "",
RegexOptions.IgnoreCase);

  //Remove trailing spaces
  result = Regex.Replace(result, @"(?(\s|\r|\n|\| )*)$", "",
RegexOptions.IgnoreCase);

  return result;
}

Example:

Input:

 


  
  

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
  

Pellentesque lorem neque, accumsan eget euismod ut, tristique et odio.

Output:


Lorem ipsum dolor sit amet, consectetur adipiscing elit.
  

Pellentesque lorem neque, accumsan eget euismod ut, tristique et odio.

Detect Browser in CSS

Avivo — Wed, 25 Aug 2010 12:07:09 +0000

Sometimes you need to detect browser version in CSS in order to apply additional, browser specific, properties to the same class.

Here are the ways for selecting specific versions of Internet Explorer by using followind conditional comments:

IE 6 and below
- Use * html {} to select the html element.
IE 7 and below
- Use *:first-child+html {} * html {} to select the html element.
IE 7 only
- Use *:first-child+html {} to select the html element.
IE 7 and modern browsers only
- Use html>body {} to select the body element.
Modern browsers only (not IE 7)
- Use html>/**/body {} to select the body element.

Example for IE7 only (change left padding to 5px instead of 20px as it is for other browsers)

.your_css_class
{
	color: #000;
	padding: 20px;
	background: #fff;
}

/* IE7 hack */
*:first-child+html .your_css_class
{
	padding-left: 5px;
}

Javascript Sleep or Wait function

Avivo — Thu, 29 Jul 2010 22:44:14 +0000

This can be one possible implementation (not very clean, but working):

function sleep(numberMillis){
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true){
		now = new Date();
		if (now.getTime() > exitTime) return;
	}
};

Submit query text in Image Button?

Avivo — Fri, 09 Apr 2010 16:55:23 +0000

You got this message in your browser while using image as button.

Just replace your code with this (value attribute is crucial):

to

Prevent link click with JQuery, avoid the javascript:void(0)

Avivo — Wed, 10 Mar 2010 12:52:19 +0000

It is forbidden to use:

Some text

Instead of that use JQuery to simulate link and you can put in href attribute whatever you want:

Some text

And in JQuery use this:

$("#myLink").click(function(e) {
  //
  //do something
  //

  //Prevent event propagation and click
  e.preventDefault();
});

How to center div using JQuery

Avivo — Fri, 29 Jan 2010 17:55:53 +0000

How can you center div or how can you center div inside another div?

This is a common problem.

For example, you have a paging with different number of pages and you need to center whole paging div inside parent div container.

JQuery is helpful there.

Look first at the picture (we want to center this paging control inside parent div control)

Center paging control

If you have paging div:

You can use JQuery syntax:

$("#paging").css('left',($("#paging").width() -
  ($(".jPag-control-front").position().left +
   $(".jPag-control-front").width())) / 2);

What does this JQuery command do?

$(“#paging”) – finds div with id=”paging”
$(“#paging”).css(‘left’, 50); – move left “paging” div for 50px
$(“.jPag-control-front”).position().left – finds left distance for div element that has css class=”jPag-control-front” from the beginning of “paging” div
So, you get the left distance of Last element (div that has css class=”jPag-control-front” ) and you add the width of Last element to this left offset and then you substract this sum from parent div width and, at the end, you divide all this by two to get the blank space you need to move you paging div from the left.

10 Best CSS Practices to Improve Your Code

Avivo — Wed, 09 Dec 2009 23:21:39 +0000

We found these guides here at WebDesignerDepot.com:

1. Stay Organized

Just like anything else, it pays to keep yourself organized. Rather than haphazardly dropping in id’s and classes in the order in which they come to mind, use a coherent structure.

It will help you keep the cascading part of CSS in mind and sets your style sheet up to take advantage of style inheritance.

Declare your most generic items first, then the not-so-generic and so on. This lets your CSS properly inherit attributes and makes it much easier for you to override a specific style when you need to. You’ll be faster at editing your CSS later because it will follow an easy to read, logical structure.

Use a structure that works best for you while keeping future edits and other developers in mind.

Resets and overrides
Links and type
Main layout
Secondary layout structures
Form elements
Miscellaneous

2. Title, Date and Sign

Let others know who wrote your CSS, when it was written and who to contact if they have questions about it. This is especially useful when designing templates or themes.

Wait a minute… what’s that bit about swatch colors? Over the years, I’ve found that adding a simple list of common colors used in my style sheets is extremely helpful during initial development and when making edits later on.

This saves you from having to open up Photoshop to sample a color from the design, or look up colors in the site’s style guide (if it has one). When you need the HTML code for that specific blue, just scroll up and copy it.

3. Keep a Template Library

Once you’ve settled on a structure to use, strip out everything that isn’t generic and save the file as a CSS template for later use.

You can save multiple versions for multiple uses: a two-column layout, a blog layout, print, mobile and so on. Coda (the editor for OSX) has an awesome Clips feature that lets you do this easily. Many other editors have a similar feature, but even a simple batch of text files will work nicely.

It’s insane to re-write each and every one of your style sheets from scratch, especially when you’re using the same conventions and methodologies in each.

4. Use Useful Naming Conventions

You’ll notice above where I declared a couple of column id’s and I called them col-alpha and col-beta. Why not just call them col-left and col-right? Think of future edits, always.

Next year you may need to redesign your site and move that left column to the right. You shouldn’t have to rename the element in your HTML and rename the id in your style sheet just to change its position.

Sure, you could just reposition that left column to the right and keep the id as #col-left, but how confusing is that? If the id says left, one should expect that it will always be on the left. This doesn’t leave you much room to move things around later on.

One of the major advantages of CSS is the ability to separate styles from content. You can totally redesign your site by just modifying the CSS without ever touching the HTML. So don’t muck up your CSS by using limiting names. Use more versatile naming conventions and stay consistent.

Leave position or style specific words out of your styles and id’s. A class of .link-blue will either make more work for you, or make your style sheet really messy when your client later asks you to change those blue links to orange.

Name your elements based on what they are, not what they look like. For example, .comment-blue is much less versatile than .comment-beta, and .post-largefont is more limiting than .post-title.

5. Hyphens Instead of Underscores

Older browsers like to get glitchy with underscores in CSS, or don’t support them at all. For better backward compatibility, get into the habit of using hyphens instead. Use #col-alpha rather than #col_alpha.

6. Don’t Repeat Yourself

Re-use attributes whenever possible by grouping elements instead of declaring the styles again. If your h1 and h2 elements both use the same font size, color and margins, group them using a comma.

This:

You should also make use of shortcuts whenever possible. Always be on the lookout for opportunities to group elements and use declaration shortcuts.

You can accomplish all of this:

with only this:

It’s very important that you understand the order in which CSS interprets these shortcuts: top, right, bottom, left. A big clockwise circle, starting at noon.

Also, if your top and bottom, or left and right attributes are the same, you only need to use two:

This sets the top and bottom margins to 1em, and the left and right margins to 0.

7. Optimize for Lightweight Style Sheets

Using the above tips, you can really cut down the size of your style sheets. Smaller loads faster, and smaller is easier to maintain and update.

Cut out what you don’t need and consolidate wherever possible by grouping. Use caution when using canned CSS frameworks as well. You’re likely to inherit lots of bulk that won’t be used.

Another quick tip for slim CSS: you don’t need to specify a unit of measure when using zero. If a margin is set to 0, you don’t need to say 0px or 0em. Zero is zero regardless of the unit of measure, and CSS understands this.

8. Write Your Base for Gecko, Then Tweak for Webkit and IE

Save yourself troubleshooting headaches and write CSS first for Gecko browsers (Firefox, Mozilla, Netscape, Flock, Camino). If your CSS works properly with Gecko, it’s much more likely to be problem free in Webkit (Safari, Chrome) and Internet Explorer.

9. Validate

Make use of W3C’s free CSS validator. If you’re stuck and your layout isn’t doing what you want it to do, the CSS validator will be a big help in pointing out errors.

10. Keep a tidy house

Separate browser-specific CSS to its own individual style sheet, and include as needed with Javascript, server-side code or conditional comments. Use this method to avoid dirty CSS hacks in your main style sheets. This will keep your base CSS clean and manageable.