Validating the target attribute as XHTML Strict o HTML 4.0 Strict
For the standards lovers here we have a trick to simulate the “target” attribute behavior without break HTML 4.0 Strict o XHTML 1.0 Strict standards.
We will use the “rel”attribute with the ”external” value that validates correctly with the above standards. We will make an script that will look for all “<a>” elements with “rel” attribute equals to “external” and then will assign a new “onclick” event to it that open in a new window the URL stored on the “href” attribute .
1 | <a href="http://www.equipo24.com" rel="external">Nice site developed with mootools</a> |
Here we have the javascript for Mootools and another general solution without need of externals libraries.
Mootools
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | function fix_external_links() { $ES('a').each(function(el) { if (el.getProperty('rel') == 'external') { el.addEvent('click', function(e) { e = new Event(e); e.stop(); window.open(this.getProperty('href')); }.bind(el)); } }); } window.addEvent('domready', function() { fix_external_links(); }); |
Without external libraries
1 2 3 4 5 6 7 8 9 10 11 | function fix_external_links() { if (!document.getElementsByTagName) return; var anchors = document.getElementsByTagName("a"); for (var i = 0; i < anchors.length; i++) { var anchor = anchors[i]; if (anchor.getAttribute("rel") && anchor.getAttribute("rel") == "external") { anchor.target = "_blank"; } } } window.onload = fix_external_links; |
If you want to check what I am working on now, then follow me at twitter @aartiles24
e24Squares - AJAX random squares image transition
Intro
e24Squares is an extension written for scriptaculous to make transitions between images with an original effect. This effect randomly generates squares that appear on different positions on the current image while the next image appears behind with a fade effect. The extension can be used as photo gallery, as slideshow, or as decorative animation in our web page.
Demos
Include Prototype 1.6.0.2 and Scriptaculous 1.8.1 in the HTML code header. Also include e24Squares after both:
1 2 3 | <script type='text/javascript' src='js/prototype.js'></script> <script type='text/javascript' src='js/scriptaculous.js?load=effects'></script> <script type='text/javascript' src='js/e24squares.js'></script> |
Next, write the necessary HTML code to define the gallery. We will need a container layer (”visor” on the example) and inside the container we will have an image for the first image in the gallery. Example below:
1 2 3 4 | <!--e24Squares container --> <div id="visor" > <img src="img/liberty.jpg" alt="imagen 1" /></div> <!-- End of e24Squares container --> |
Finally, we write the necessary javascript code. As first param we will provide the container layer id (”visor”), and as second param an images filenames array and as the last one an option’s array.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | oe24Squares = new e24Squares( 'visor', [ 'liberty.jpg', 'newyork2.jpg', 'mexico.jpg', 'newyork.jpg' ], { base: 'img/', width: 640, height: 300, rows: 3, cols: 5, hideonfinish: true, autostart: true, duration: 1.0, interval: 1.0 } ); |
Options
- base: Relative path to the image directory. Default is the same directory as the web page
- width: Width in pixels for the gallery visor.
- height: Height in pixels for the gallery visor.
- rows: Rows quantity in which the effect will divide the visor to form the random squares. Default value: 3
- cols: Columns quantity in which the effect will divide the visor to form the random squares. Default value:5
- duration: Decimal, representing the time in seconds that each transition between the current image and the next one will take. Default value: 1.0
- interval: Decimal, representing the time in seconds that will take to begin the next image transition. Default value: 0.3
- color: Represents the random squares color. Default value: #ffffff
- autostart: Boolean, if set to “true” the animation starts automatically, if set to “false” then we will need to call start() method to initiate the animation or to call the transition() method to go to an specific image. Default value: “false”
- hideonfinish: Boolean, if set to “true” then the visor will be hidden after showed the last photo, else the last photo will keep visible. Valor por defecto: false
- callback: callback function that will be processed once the animation is complete. It is useful to concatenate animations.
Methods
- start: No params needed. Initiates the slideshow if the effect object was created with the autostart option set to “false”.
- transition((int)index, (function)pCallback): The first param is the picture index to show(the first is zero), the second param is a callback function that will be called once finished the transition.
1 | oe24Squares.transition(2); |
Known Issues
- Ability to make the slideshow to play infinitely.
Download
e24Squares 0.2 beta (218 KB, including the demos)
If you want to check what I am working on now, then follow me at twitter @aartiles24
Gracefully degrade with Prototype. The onDomReady event
Following up on the previous post, we saw how important is to take care about our AJAX scripts to degrade gracefully. Today we will see how to do it in the practice using prototype.
We will take as example the e24Writer described on previous posts. The e24Writer gradually display a group of elements using a chained opacity transition, for that reason we need that those elements be hidden before the event run. For example if we going to animate the text “AJAX”, in the way that appear letter-by-letter. If we initially hide that text using the CSS display property setting it to none, then if due to any of the reasons described on the last post we don’t have javascript then the web won’t degrade gracefully because the text “AJAX” never will appear.
But if we initially leave the text visible then we will need to hide it before the page renders, to accomplish this we need an event that fires when we have total access to the DOM and before the page renders. That event is the “domReady”.
Some AJAX libraries like Mootools, YUI o ExtJs natively have the “domReady”event, Prototype don’t. But if we look on Google by the term “prototype domReady” then we will find some extensions like this one
1 2 3 4 | Event.onDOMReady(function() { $('text').hide(); oe24Writer = new e24Writer( 'text', { autostart: true, duration: 1.0, interval: 0.3 }); }); |
In this way the text can be read even when the javascript is disabled.
If you want to check what I am working on now, then follow me at twitter @aartiles24
Gracefully degrade with AJAX
With each new browser’s version we found new programming features that let us make more advanced AJAX effects. Even when most of these improvements are present at the major browsers that are more standard every day, there are always many reasons to found different users configurations:
- Users that keep using old browser’s versions.
- Users that use less popular and less standard browsers.
- User that disable javascript or make other restrictions for security reasons.
- Search engine’s spiders that do not use to parse javascript and then some texts can leave hidden.
- Users with accessibility limitations that use other ways to read the pages.
In order to reach all these users we need that those pages that use javascript to make advanced AJAX effects gracefully degrade, that means that the page must be able to work even when javascript or another special features are disabled.
In the next post we will see a real case and how to solve it using Prototype.
If you want to check what I am working on now, then follow me at twitter @aartiles24
e24TabMenu – Drop down AJAX menu
Introdution
e24TabMenu is a plugin written for scriptaculous. It is a tab menu that expands collapse smoothly.
Demos
Usage
Include Prototype 1.6.0.2 and Scriptaculous 1.8.1 in the HTML code header. Also include e24TabMenu after both:
1 2 3 | <script type='text/javascript' src='js/prototype.js'></script> <script type='text/javascript' src='/js/scriptaculous.js?load=effects'></script> <script type='text/javascript' src='js/e24tabmenu.js'></script> |
Next, write the necesary HTML code to define de menu. We will need a container layer (“menu” on the example) and inside the container we will have a layer for each menu item where we will add its content. After that, add links (html tag “A”) for each menu’s tab, the “rel” attribute value must be e24menuitem[layer_id] where layer_id is the id of the content layer (on the example “ítem_3d”, “ítem_gall”, “ítem_menu”, “ítem_efec”). Bellow the links we can add contents that will show when all tabs are collapsed.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | <div id="menu" ><!---menu container-->
<div id="item_3d" class="menutarget">
Contenido</div>
<div id="item_gall" class="menutarget">
Contenido</div>
<div id="item_menu" class="menutarget">
Contenido</div>
<div id="item_efec" class="menutarget">
Contenido</div>
<!---tabs del menu-->
<a id="3d" href="#3d" rel="e24menuitem[item_3d]"><img src="img/3d.gif" alt="Efectos 3D" /></a>
<a id="gall" href="#galerias" rel="e24menuitem[item_gall]"><img src="img/galerias.gif" alt="Galeria de fotos AJAX" /></a>
<a id="menus" href="#menus" rel="e24menuitem[item_menu]" ><img src="img/menus.gif" alt="Efectos de Menus" /></a>
<a id="efec" href="#efectos" rel="e24menuitem[item_efec]"><img src="img/efectos.gif" alt="Otros efectos ajax" /></a>
<!---tabs del menu-->
<div id="maincontent">
Contenido principal</div>
<!--texto--></div>
<!--menu container--> |
Finally we write the necesary javascript code to define the menu. As first param we will pass the container layer id , and as second param an option’s array.
1 | oe24TabMenu = new e24TabMenu( 'menu', { duration: 1.0, transition: Effect.Transitions.sinoidal } ); |
Options
- duration: Decimal, representing the time in seconds that will take the menu item movement. Default value: 1.0
- transition: Function that modifies each animation’s point: Effect.Transitions.sinoidal (default), Effect.Transitions.linear, Effect.Transitions.reverse, Effect.Transitions.wobble, Effect.Transitions.flicker
- callback: callback function that will be processed once the animation is complete. It is useful to concatenate animations.
Methods
- toggleMenu: Toggles the tab. Requieres the object reference of the corresponding link.
1
oe24TabMenu.toggleMenu($('3d'));
Known Issues
- Add more directions like, down-top, letf-right, right-left.
Download
e24TabMenu 0.8 beta (176 KB)
If you want to check what I am working on now, then follow me at twitter @aartiles24
e24Writer - Chained opacity transition
Intro
e24Writer is a plugin written for scriptaculous to gradually display a group of elements using a chained opacity transition. The elements can be either images, HTML or text.
Demos
Usage
Include Prototype 1.6.0.2 and Scriptaculous 1.8.1 in the HTML code header. Also include e24Writer after both.
1 2 3 | <script type='text/javascript' src='js/prototype.js'></script> <script type='text/javascript' src='/js/scriptaculous.js?load=effects'></script> <script type='text/javascript' src='js/e24writer.js'></script> |
For example, if we have text that we want to appear gradually letter-by-letter. First, we need to split the text into individual letters. If the text is a whole image then we need to split it in an image per letter basis.
Next, write the necessary HTML code to define the animation. We will need a container layer (”letters” on the example) and inside the container we will have a layer for each element. There is one layer per letter. Example below:
1 2 3 4 5 6 | <div id="letters" > <div class="letter"><img src="img/letter1.jpg" alt="letra1" /></div> <div class="letter"><img src="img/letter2.jpg" alt="letra2" /></div> <div class="letter"><img src="img/letter3.jpg" alt="letra3" /></div> <div class="letter"><img src="img/letter4.jpg" alt="letra4" /></div> </div> |
Finally, we write the necessary javascript code. As first param we will provide the container layer id, and as second param an option’s array.
1 | oe24Writer = new e24Writer( 'letters', { autostart: true, duration: 1.0, interval: 0.3 }); |
Options
- autostart: Boolean, if set to “true” the animation starts automatically, if set to “false” then we will need to call start() method to initiate the animation. Default value: “false”
- duration: Decimal, representing the time in seconds that each element transition will take. Default value: 1.0
- interval: Decimal, representing the time in seconds that will take between each element transition. Default value: 0.3
- callback: callback function that will be processed once the animation is complete. It is useful to concatenate animations.
Methods
- start: No params needed. Initiates the animation if effect object was created with the autostart option set to “false”.
Known Issues
- Add more direction, like right-left.
- Ability to restart the animation.
Download
e24Writer 0.4.1 beta (71.33 KB)
If you want to check what I am working on now, then follow me at twitter @aartiles24
