jQuery实现本地预览上传图片功能

2019-11-20 10:50:22

字体：大中小

来源：转载

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本文实例介绍了基于JQUERY扩展，图片上传预览插件，目前兼容浏览器(IE 谷歌火狐) 不支持safari，分享给大家供大家参考，具体内容如下

HTML代码：

<html><head><title>图片上传预览演示</title><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script><script src="16/uploadPreview.js" type="text/javascript"></script><script>$(function () {$("#up").uploadPreview({ Img: "ImgPr", Width: 120, Height: 120 });});</script></head><body><div style="width:500px;margin:0px auto;"><h2>图片上传预览演示</h2><a href="# target="_blank">原文</a><div><img id="ImgPr" width="120" height="120" /></div><input type="file" id="up" /></div></body></html>

js代码：

*参数说明: Img:图片ID;Width:预览宽度;Height:预览高度;ImgType:支持文件类型;Callback:选择文件显示图片后回调方法;*使用方法: <div><img id="ImgPr" width="120" height="120" /></div><input type="file" id="up" />把需要进行预览的IMG标签外 套一个DIV 然后给上传控件ID给予uploadPreview事件$("#up").uploadPreview({ Img: "ImgPr", Width: 120, Height: 120, ImgType: ["gif", "jpeg", "jpg", "bmp", "png"], Callback: function () { }});*/jQuery.fn.extend({uploadPreview: function (opts) {var _self = this,_this = $(this);opts = jQuery.extend({Img: "ImgPr",Width: 100,Height: 100,ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],Callback: function () {}}, opts || {});_self.getObjectURL = function (file) {var url = null;if (window.createObjectURL != undefined) {url = window.createObjectURL(file)} else if (window.URL != undefined) {url = window.URL.createObjectURL(file)} else if (window.webkitURL != undefined) {url = window.webkitURL.createObjectURL(file)}return url};_this.change(function () {if (this.value) {if (!RegExp("/.(" + opts.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {alert("选择文件错误,图片类型必须是" + opts.ImgType.join("，") + "中的一种");this.value = "";return false}if ($.browser.msie) {try {$("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))} catch (e) {var src = "";var obj = $("#" + opts.Img);var div = obj.parent("div")[0];_self.select();if (top != self) {window.parent.document.body.focus()} else {_self.blur()}src = document.selection.createRange().text;document.selection.empty();obj.hide();obj.parent("div").css({'filter': 'progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)','width': opts.Width + 'px','height': opts.Height + 'px'});div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src}} else {$("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))}opts.Callback()}})}});

直接上第二段代码，jquery js实现上传图片之前预览本地图片

<style type="text/css">#preview_wrapper{    display:inline-block;    width:300px;    height:300px;    background-color:#CCC;}  #preview_fake{    filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);  }  #preview_size_fake{    filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);     visibility:hidden;  }  #preview{    width:300px;    height:300px;  }  </style><script type="text/javascript">function onUploadImgChange(sender){    if( !sender.value.match( /.jpg|.gif|.png|.bmp/i ) ){      alert('图片格式无效！');      return false;    }  var objPreview = document.getElementByIdx_x('preview');    var objPreviewFake = document.getElementByIdx_x('preview_fake');    var objPreviewSizeFake = document.getElementByIdx_x('preview_size_fake');  if( sender.files && sender.files[0] ){      objPreview.style.display = 'block';      objPreview.style.width = 'auto';      objPreview.style.height = 'auto';            // Firefox 因安全性问题已无法直接通过 input[file].value 获取完整的文件路径      objPreview.src = sender.files[0].getAsDataURL();      }else if( objPreviewFake.filters ){      // IE7,IE8 在设置本地图片地址为 img.src 时出现莫名其妙的后果      //（相同环境有时能显示，有时不显示），因此只能用滤镜来解决            // IE7, IE8因安全性问题已无法直接通过 input[file].value 获取完整的文件路径      sender.select();      var imgSrc = document.selection.createRange().text;            objPreviewFake.filters.item(        'DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;      objPreviewSizeFake.filters.item(        'DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;            autoSizePreview( objPreviewFake,        objPreviewSizeFake.offsetWidth, objPreviewSizeFake.offsetHeight );      objPreview.style.display = 'none';    }  }   function onPreviewLoad(sender){    autoSizePreview( sender, sender.offsetWidth, sender.offsetHeight );  }   function autoSizePreview( objPre, originalWidth, originalHeight ){    var zoomParam = clacImgZoomParam( 300, 300, originalWidth, originalHeight );    objPre.style.width = zoomParam.width + 'px';    objPre.style.height = zoomParam.height + 'px';    objPre.style.marginTop = zoomParam.top + 'px';    objPre.style.marginLeft = zoomParam.left + 'px';  }   function clacImgZoomParam( maxWidth, maxHeight, width, height ){    var param = { width:width, height:height, top:0, left:0 };        if( width>maxWidth || height>maxHeight ){      rateWidth = width / maxWidth;      rateHeight = height / maxHeight;            if( rateWidth > rateHeight ){        param.width = maxWidth;        param.height = height / rateWidth;      }else{        param.width = width / rateHeight;        param.height = maxHeight;      }    }        param.left = (maxWidth - param.width) / 2;    param.top = (maxHeight - param.height) / 2;        return param;  }</script> <input name="localfile" type="file" id="localfile" size="28" onchange="onUploadImgChange(this)"/> <!--以下是预览图片用的--><div id="preview_wrapper"><div id="preview_fake"><img id="preview" src="" onload="onPreviewLoad(this)"/></div></div><br/><img id="preview_size_fake" />

以上就是本文的全部内容，希望对大家的学习有所帮助。

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