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  • js实现图片上传前预览

    利用js实现了图片上传前的预览

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Image Preview</title>
        <style>
            .image-preview{
                300px;
                min-height: 100px;
                border:2px solid #dddddd;
                margin-top: 15px;
    
                display:flex;
                align-items: center;
                justify-content: center;
                font-weight: bold;
                color:#cccccc;
            }
            .image-preview__image{
                display:none;
                100%;
            }
        </style>
    </head>
    <body>
        <h1>文件上传图片预览</h1>
        <input type="file" name="inpFile" id="inpFile">
        <div id="imagePreview" class="image-preview">
            <img src="" alt="image preview" class="image-preview__image">
            <span class="image-preview__default-text">图片预览</span>
        </div>
        <script>
            const inpFile=document.getElementById("inpFile");
            const previewContainer=document.getElementById("imagePreview");
            const previewImage=previewContainer.querySelector('.image-preview__image');
            const previewDefaultText=previewContainer.querySelector('.image-preview__default-text');
    
            inpFile.addEventListener("change",function(){
                const file=this.files[0];
                if(file){
                    const reader=new FileReader();
                    previewDefaultText.style.display='none';
                    previewImage.style.display='block';
    
                    reader.addEventListener('load',function(){
                        console.log(this);
                        previewImage.setAttribute('src',this.result);
                    });
    
                    reader.readAsDataURL(file);
                }else{
                    previewDefaultText.style.display=null;
                    previewImage.style.display=null;
                    previewImage.setAttribute('src',"");
                }
            });
        </script>
    </body>
    </html>
    

    效果:
    在这里插入图片描述

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  • 原文地址:https://www.cnblogs.com/AlexanderZhao/p/13344622.html
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