Posted in Javascript onJuly 30, 2009
/*
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);
} 这个是封装后js代码
下面看看这段代码如何使用
$(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"});
});
}) 下面看下html代码
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <link rel="stylesheet" type="text/css" href="css/imgareaselect-animated.css" href="css/imgareaselect-animated.css" /> <script type="text/javascript" src="jquery-1.3.2.min.js" src="jquery-1.3.2.min.js"></script> <script type="text/javascript" src="scripts/jquery.imgareaselect.pack.js" src="scripts/jquery.imgareaselect.pack.js"></script> </head> <body> <div id="s"> <img id="mypic" name="mypic" dt="sanshi" src="scott-h-biram.jpg" src="scott-h-biram.jpg" title="mypic"/> </div> <div id="preview"></div> <div><input type="button" id="save_pic" value="保存"></div> </body> </html>
这里面的html的头式不能丢的，如果丢了，会在ie7下有问题，不影响使用，但是影响美观度
插件打包下载地址 https://3water.com/jiaoben/31986.html
jquery imgareaselect 使用利用js与程序结合实现图片剪切
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