HanG321 Blog

Detect IE version

var is_ie/*@cc_on = {
// quirksmode : (document.compatMode==”BackCompat”),
version : parseFloat(navigator.appVersion.match(/MSIE (.+?);/)[1])
}@*/;

(Uncomment the second line if you also wish to check whether IE is running in “compatibility” (quirks) mode or in standards-mode.)

All other browsers cheerfully ignore the Javascript comment block (/* … */) so what they end up with is essentially this:

var is_ie;

…which evaluates as an implicit false, when used as a condition. This allows us to set up conditions like this one:

if (is_ie && (is_ie.version < 7))
{
// do IE specific stuff
}
else if (is_ie && (is_ie.version >= 7))
{
//do IE 7 or above specific stuff
}
else
{
// default behavior for other browsers
}

[reference : http://mar.anomy.net/entry/2006/11/23/00.06.40/ ]

Technorati : IE, javascript, version

javascript: rotate image with jQuery library

jQuery.fn.rotate = function(angle,whence) {
var p = this.get(0);

// we store the angle inside the image tag for persistence
if (!whence) {
p.angle = ((p.angle==undefined?0:p.angle) + angle) % 360;
} else {
p.angle = angle;
}

if (p.angle >= 0) {
var rotation = Math.PI * p.angle / 180;
} else {
var rotation = Math.PI * (360+p.angle) / 180;
}
var costheta = Math.cos(rotation);
var sintheta = Math.sin(rotation);

if (document.all && !window.opera) {
var canvas = document.createElement(‘img’);

canvas.src = p.src;
canvas.height = p.height;
canvas.width = p.width;

canvas.style.filter = “progid:DXImageTransform.Microsoft.Matrix(M11=”+costheta+”,M12=”+(-sintheta)+”,M21=”+sintheta+”,M22=”+costheta+”,SizingMethod=’auto expand’)”;
} else {
var canvas = document.createElement(‘canvas’);
if (!p.oImage) {
canvas.oImage = new Image();
// assigning following parameters to fix jquery-rotate.1-1 bug on FF2
canvas.oImage = p;
canvas.oImage.src = p.src;
canvas.oImage.width = p.width;
canvas.oImage.height = p.height;
//end of modified
} else {
canvas.oImage = p.oImage;
}

canvas.style.width = canvas.width = Math.abs(costheta*canvas.oImage.width) + Math.abs(sintheta*canvas.oImage.height);
canvas.style.height = canvas.height = Math.abs(costheta*canvas.oImage.height) + Math.abs(sintheta*canvas.oImage.width);

var context = canvas.getContext(’2d’);
context.save();
if (rotation <= Math.PI/2) {
context.translate(sintheta*canvas.oImage.height,0);
} else if (rotation <= Math.PI) {
context.translate(canvas.width,-costheta*canvas.oImage.height);
} else if (rotation <= 1.5*Math.PI) {
context.translate(-costheta*canvas.oImage.width,canvas.height);
} else {
context.translate(0,-sintheta*canvas.oImage.width);
}
context.rotate(rotation);
context.drawImage(canvas.oImage, 0, 0, canvas.oImage.width, canvas.oImage.height);
context.restore();
}
canvas.id = p.id;
canvas.angle = p.angle;
p.parentNode.replaceChild(canvas, p);
}

jQuery.fn.rotateRight = function(angle) {
this.rotate(angle==undefined?90:angle);
}

jQuery.fn.rotateLeft = function(angle) {
this.rotate(angle==undefined?-90:-angle);
}

Technorati : jquery, rotate