原生js上传图片时的预览

时间：2022-10-25 13:47:04
<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <title>checkbox -value </title>

    <link rel="stylesheet" href="">

    <script src='./jquery-1.7.1.min.js'></script>

    <style type="text/css">

    .showImg {}

    .showImg img {

        width: 50px;

        height: 50px;

    }

    </style>

</head>

<body>

    <div class="main">

        <label for="imgfile"><span class="fakeButton">Insert Images</span></label>

        <!-- 下面为了避免中文，由上面替换 -->

        <!-- <input type="file" accept="image/jpeg,image/png,image/gif" name="imgfile" id="imgfile" multiple value="Insert Image" onchange="javascript:setImagePreview();" style="position:absolute;clip:rect(0 0 0 0);"> -->

        <input type="file" accept="image/jpeg,image/png,image/gif" name="imgfile" id="imgfile" multiple onchange="javascript:setImagePreview();">

        <br />

        <div id="showImg" class="showImg"></div>

    </div>

    <script type="text/javascript">

    function setImagePreview() {

        var imghtml = imgUrls();

        if (imghtml === '111') {

            window.alert('Notice', 'You can upload up to three photos');

            return false;

        }

        $('#showImg').html(imghtml);

    }

// 限制传递图片的张数

    function imgUrls() {

        var imgsrcs = getUrl();

        var imghtml = '';

        var len = imgsrcs.length;

        if (len > 3) {

            return '111';

        }

        for (var i = 0; i < len; i++) {

            imghtml += '<img src=' + imgsrcs[i] + ' alt="you have selected">&nbsp;&nbsp;';

        }

        return imghtml;

    }

    function getUrl() {

        var obj = $('#imgfile')[0].files;

        var len = obj.length;

        var imgsrcs = [];

        for (var i = 0; i < len; i++) {

            imgsrcs[i] = getObjectURL(obj[i]);

        }

        //添加图片路径到img src中进行预览

        //不同浏览器下的路径不同

        function getObjectURL(file) {

            var url = null;

            if (window.createObjectURL != undefined) { // basic

                url = window.createObjectURL(file);

            } else if (window.URL != undefined) { // mozilla(firefox)

                url = window.URL.createObjectURL(file);

            } else if (window.webkitURL != undefined) { // webkit or chrome

                url = window.webkitURL.createObjectURL(file);

            }

            return url;

        }

        return imgsrcs;

    }

    </script>

</body>

</html>

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