jqueryimgareaselect使用利用js与程序结合实现图片剪切_jquery

/*
缺陷，当前在ff3下，用jquery的 width()与height()函数，在不设置图片的宽度与高度的时候，不能取到
需要在图片load函数里面初始化才可以
*/
sanshi_imgareaselect = function(pic_id,view_div_id){
this.pic_obj = jQuery("#"+pic_id);
this.pic_width;
this.pic_height;
this.view_div_id = view_div_id;
this.view_width = 100;
this.view_height = 100;
this.view_img_id = view_div_id+"_sanshi_img";
this.ias;
}
//建立预览图片
sanshi_imgareaselect.prototype.make_view_pic =function(){
var img_obj = jQuery(document.createElement("IMG"));
img_obj.attr("src",this.pic_obj.attr("src"));
img_obj.attr("id",this.view_img_id);
img_obj.attr("width",this.view_width);
img_obj.attr("height",this.view_height);
return img_obj;
}
//初始化函数
sanshi_imgareaselect.prototype.init=function(){
this.pic_width = this.pic_obj.attr("width");
this.pic_height = this.pic_obj.attr("height");
//alert(this.pic_width+":"+this.pic_height);
//添加图片
jQuery("#"+this.view_div_id).append(this.make_view_pic());
//设置预览加载层样式
jQuery("#"+this.view_div_id).css({'width':this.view_width,'height':this.view_height,'overflow':'hidden'});
//构造选择区域完成的函数
var fun_str="if ( selection.width && selection.height){ var scaleX = "+this.view_width+" / selection.width;var scaleY = "+this.view_height+" / selection.height;jQuery('#"+this.view_img_id+"').css({width: Math.round(scaleX * "+this.pic_width+"),height: Math.round(scaleY * "+this.pic_height+"),marginLeft: -Math.round(scaleX * selection.x1),marginTop: -Math.round(scaleY * selection.y1)});}";
//alert(fun_str);
//初始化imgAreaSelect 函数
var ias = this.pic_obj.imgAreaSelect({
//设置选择框的比列
//aspectRatio:"1:1",
//设置框的添加效果
fadeSpeed:200,
//选择框选择完毕是否自己取消
autoHide:false,
//是否显示图片遮罩层
show:true,
//是否采用api
instance: true,
//设置初始函数 画出选择框
onInit:function(img, selection){ias.setSelection(100, 50, 250, 150, true);ias.update();},
//设置选择完毕的函数，采用了动态执行
onSelectEnd:function(img, selection){eval(fun_str);}
});
//赋值给全局
this.ias = ias;
}
//保存事件 采用的是get方式提交
sanshi_imgareaselect.prototype.save_pic=function(post_page,post_param){
var opt = this.ias.getSelection(true);
var post_arr = new Array();
jQuery.each(post_param,function(i,n){
var temp_str =i+"=";
temp_str += opt[n] ? opt[n] : n;
post_arr.push(temp_str);
});
//判断，是否有参数
post_page += post_page.lastIndexOf("?")<0 ? "?" : "&";
//拼装get方式的url
post_url = post_page+post_arr.join("&");
alert(post_url);
}

$(document).ready(function () {

//声明函数
var sanshi_img = new sanshi_imgareaselect("mypic","preview");
//确保图片加载完成执行初始化函数，这样避免上面的提到的bug，否则不能保证兼容性
$("#mypic").load(function(){sanshi_img.init();});
//监听保存事件
$("#save_pic").click(function(){
sanshi_img.save_pic('1.php?n=6',{"id":5,"px1":"x1","py1":"y1",'px2':"x2","py2":"y2",'pwidth':"width",'pheight':"height"});
});
})