For Javascript devs
If you write Javascript apps you may want to dynamically add some HTML here and there and having HTML strings that need concatenation with different variables is bad and ugly at the same time. So here is a little nugget you might find useful.
1 2 3 4 5 | // standard style x = '<div class="' + classnames + '" rel="' + somevar + '" id="' + othervar + '">' + content + '</div>'; // html tag style x = htmlTag('div', {class:classname, rel:somevar, id:othervar}, content); |
Usage
htmlTag(tagName [, attributes [, content]])
or
htmlTag(tagName [, content [, attributes]])
The function can be called with one, two or three arguments. Beside the first one which is the name of the tag (string), the other two are optional and can be placed in whatever order you like.
For img tags, the content argument is set as src attribute or as value attribute for input tags if the attributes argument doesn't specify otherwise
attributes argument must be an object with key:value pairs and will be expanded as attributes of the tag
content argument is a string or number
1 2 3 4 5 6 7 8 9 10 11 12 13 | var classname = 'test', somevar = 2, id = 'mydiv', content = 'hello'; htmlTag('div', {class:classname, rel:somevar, id:othervar}, content); htmlTag('div', content, {class:classname, rel:somevar, id:othervar}); // will both return <div class='test' rel='2' id='mydiv'>hello</div> htmlTag('img', content) // <img src='hello' /> htmlTag('img', {src:'myImage.jpg'}, content) // <img src='myImage.jpg' /> content is discarded and attributes src is used as source htmlTag('input', {type:'text', name:id}, content) // <input type="text" name="mydiv" value="hello" /> |
The code
1 2 3 4 5 6 7 8 9 10 11 | function htmlTag(type) { var r="< "+type,o={},v='',x=0,a=arguments; a.length==3&&(((x=typeof a[1]=='object')||1)&&((o=a[-~!x]||{})&&(v=a[-~x]||'')))||a.length==2&&(typeof a[1]=='object'&&(o=a[1]||{})||(v=a[1]||'')); for(var i in o)r+=" "+i+"='"+o[i]+"'"; (type=='img'||type=='br'||type=='input')&&((!o.src&&v)&&((type=='img'&&(r+=" src='"+v+"' />"))||(type=='input'&&(r+=" value='"+v+"' />")))||(r+=' />'))||(r+=">"+v+"< "+"/"+type+">"); return r; } function queryTag(type) { return $(htmlTag.apply(this, arguments)) } |
queryTag function just wraps the newly created html in a jQuery object so you can have something like this
1 2 3 4 5 | $("#menu").append( queryTag('div', {class:'menuItem'}, 'Click me').click(function() { alert('clicked'); }) ) |
Delete old snapshots from Alfresco
If you're an Alfresco user, you may have noticed that it creates a snapshot of the store every time you publish something in the staging sandbox. In time this ads up to a lot of MB. If you wish to delete old snapshots of your store, here's the way to do it with version 2.2+ of Alfresco using the AVM Console
First, open up the console at http://host:port/alfresco/faces/jsp/admin/avm-console.jsp
In the command line box, write
lsver, mystore
(where mystore is the name of your store)
This command will list all the snapshots. Now, you can remove individual snapshots by their id with
rmver, mystore, version
or remove a bunch of snapshots between two dates with
rmvers, mystore, 2010-06-25T10:43:06.214Z, 2010-12-09T12:30:26.769Z
The dates you can get from the list of snapshots. The documentation says that the date must be in ISO 8601 but I got an error trying to copy-paste the date from the list with the timezone at the end (+01:00) so I replaced that with Z and worked just fine.
Read/Load files from ZIP in JavaScript
At work we do a lot of JavaScript applications that have little to no HTML files (beside the index), everything is generated by JavaScript and we have tons of .js files that load at runtime and to reduce the size we have to minify them and that is really hard to debug and watch in the browser if something goes wrong. So I've made this JavaScript class that comes to help. What can you do is Zip up all your assets (js, images, css) and use ZipLoader class to read the zip and unpack your resources whenever you need them. It's small (10KB), easy to use and quite fast considering the extraction is made by JavaScript.
1 2 3 4 5 6 7 8 9 10 | // loads and caches the zip file var loader = new ZipLoader('files.zip'); // creates a style node in the document header and appends the style loader.LoadCSS('files.zip://style.css'); // creates a script node in the document header and appends the script loader.loadScript('files.zip://jquery.js'); // returns the file content var someFileYouNeed = loader.load("files.zip://myFile.txt"); // returns the base64 encoded image usable as img source $("#logo").attr('src', loader.loadImage('files.zip://images/logo.png')); |
The level of compression using zip surpasses the js and css minification in all the ways possible. For example, My current application has 79 files (js, and few css) and they all sum up to 924KB in size. Zipping all those 96 files using Ultra compression level gives me 1 file of 126 KB => 1 server request. That's something.
The best performance is made Opera (strangely), then Firefox, Crome, Safari and last IE (no surprise here, I was expecting it before I even started).
It's a V 1.0 that still needs some work and it doesn't work in IE because that stupid browser overrides the mime type and at first null character in the reading of the zip, the content ends. I will fix this eventually I will also include this as a jClass library soon.
Update: Fixed it so it works in IE as well. There is a performance issue still. Will fix that too.
Till then, HERE are the sources and a demo.
The zip in the demo is made using 7Zip with Ultra Compression level.
Happy codding.
Parse XML in JavaScript with jQuery
Yes, you can do it with XMLDOM and all the other ways out there, but why not use the power of jQuery ?
Like so:
1 2 3 4 5 6 7 | <root> <items> <item name="first" id="1">Content 1</item> <item name="second" id="2">Content 2</item> </items> <other atribute="true" /> </root> |
1 2 3 4 | var xml = '<root ......'; var obj = $(xml); // and now you can use jquery selectors to get what you want $("item[name=second]", obj).attr('id'); // 2 |