file_upload_demo.html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script src="../static/dist/js/jquery-1.11.3.min.js"></script>
<script src="../static/js/ys_ui_plugin/simple_file_upload.js"></script>
</head>
<body>
<a href="javascript:void(0)">上传文件</a>
<img />
<script>
$("a").simpleUploadFile({
changeCallback:function(file){
var fileReader = new FileReader();
fileReader.onload = function(){
$("img").attr("src",this.result);
};
fileReader.readAsDataURL(file);
}
});
</script>
</body>
</html>simple_file_upload.js
(function($){
var defaultSettings = {
acceptTypes:["jpg","png"], // 接受的上传文件类型
changeCallback:function(file){
} // 自定义input[type=file] change事件
};
var renderHtml = "<input type='file' style='display:none;'/>";
// 添加隐藏的
function renderInputFile(target,settings){
// 生成dialog唯一标识
var id = "ys_simple_file_upload_"+new Date().getTime()+""+parseInt(Math.random());
$(target).attr("ys_simple_file_upload",id);
$(renderHtml).attr("id",id).appendTo("html"); // 添加到文档中去
return $("#"+id);
}
function bindEventHandlers(container,settings){
var changeCallback = settings.changeCallback;
$(container).change(function(e){
e.preventDefault();
e.stopPropagation();
var file = e.target.files[0];
if(!validateFileType(file,settings)){
alert("文件类型不正确!");
return;
}
changeCallback(file);
});
}
// 验证文件类型
function validateFileType(file,settings){
var acceptTypes = settings.acceptTypes;
var name = file.name;
var fileSuffix = name.substr(name.lastIndexOf(".")+1);
for(var i=0;i<acceptTypes.length;i++){
var acceptType = acceptTypes[i];
if(acceptType==fileSuffix){
return true;
}
}
return false;
}
var options = {
simpleUploadFile:function(settings) {
var mergedSettings = {};
$.extend(mergedSettings,defaultSettings,settings);
var container = renderInputFile(this,mergedSettings);
bindEventHandlers(container,mergedSettings);
$(this).click(function(e){
e.preventDefault();
e.stopPropagation();
$(container).click();
});
}
};
$.fn.extend(options);
})(jQuery);
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