我希望能够在上传文件(图像)之前预览它。预览操作应该在浏览器中全部执行,而不使用Ajax上传图像。

我该怎么做?


当前回答

短双衬套

这是cmlevy答案的大小改进-尝试

<input-type=file oninput=“pic.src=window.URL.createObjectURL(this.files[0])”><img id=“pic”/>

其他回答

使用JavaScript(jQuery)和HTML5的多个图像示例

JavaScript(jQuery)

function readURL(input) {
     for(var i =0; i< input.files.length; i++){
         if (input.files[i]) {
            var reader = new FileReader();

            reader.onload = function (e) {
               var img = $('<img id="dynamic">');
               img.attr('src', e.target.result);
               img.appendTo('#form1');  
            }
            reader.readAsDataURL(input.files[i]);
           }
        }
    }

    $("#imgUpload").change(function(){
        readURL(this);
    });
}

标记(HTML)

<form id="form1" runat="server">
    <input type="file" id="imgUpload" multiple/>
</form>

使用纯JavaScript以可重用的方式在单个函数中预览多个文件和单个文件

函数imagePreviewFunc(即,previewerId){let files=that.filepreviewerId.innerHTML=“”//重置图像预览元素for(假设i=0;i<files.length;i++){let imager=document.createElement(“img”);imager.src=URL.createObjectURL(文件[i]);previewerId.append(成像器);}}<input accept=“image/*”type='file'id=“imageInput_1”onchange=“imagePreviewFunc(this,imagePreview_1)”/><div id=“imagePreview_1”>此分区用于单图像预览</div><hr/><input class=“form control”accept=“image/*”type='file'id=“imageInput_2”multiple=“true”onchange=“imagePreviewFunc(this,imagePreview_2)”/><div id=“imagePreview_2”>此div用于多图像预览</div>

试试这个

window.onload=函数(){if(window.File&&window.FileList&&windows.FileReader){var filesInput=document.getElementById(“uploadImage”);filesInput.addEventListener(“更改”,函数(事件){var files=事件目标文件;var output=document.getElementById(“result”);对于(var i=0;i<files.length;i++){var file=文件[i];if(!file.type.match('image'))持续var picReader=新文件读取器();picReader.addEventListener(“加载”,函数(事件){var picFile=事件目标;var div=document.createElement(“div”);div.innerHTML=“<img class='umbnail'src='”+picFile.result+“'”+“title='”+picFile.name+“'/>”;output.insertBefore(div,null);}); picReader.readAsDataURL(文件);}});}}<input type=“file”id=“uploadImage”name=“termek_file”class=“file_input”multiple/><div id=“result”class=“uploadPreview”>

这里有一种在上传前使用纯javascript预览图像的简单方法;

//profile_change is the id of the input field where we choose an image
document.getElementById("profile_change").addEventListener("change", function() {

//Here we select the first file among the selected files.
const file = this.files[0];

/*here i used a label for the input field which is an image and this image will 
  represent the photo selected and profile_label is the id of this label */
const profile_label = document.getElementById("profile_label");

//Here we check if a file is selected
if(file) {
    //Here we bring in the FileReader which reads the file info. 
    const reader = new FileReader();
    
    /*After reader loads we change the src attribute of the label to the url of the 
    new image selected*/
    reader.addEventListener("load", function() {
        dp_label.setAttribute("src", this.result);
    })

    /*Here we are reading the file as a url i.e, we try to get the location of the 
    file to set that as the src of the label which we did above*/
    reader.readAsDataURL(file);

}else {
    //Here we simply set the src as default, whatever you want if no file is selected.
    dp_label.setAttribute("src", "as_you_want")
}
});

这里是HTML;

<label for="profile_change">
            <img title="Change Profile Photo" id="profile_label" 
             src="as_you_want" alt="DP" style="height: 150px; width: 150px; 
               border-radius: 50%;" >
</label>
<input style="display: none;" id="profile_change" name="DP" type="file" class="detail form-control">

单层解决方案:

下面的代码使用对象URL,在查看大型图像时,它比数据URL更有效(数据URL是包含所有文件数据的巨大字符串,而对象URL只是引用内存中文件数据的短字符串):

<img id=“blah”alt=“your image”width=“100”height=“100”/><输入类型=“文件”onchange=“document.getElementById('blah').src=window.URL.createObjectURL(this.files[0])”>

生成的URL如下:

blob:http%3A//localhost/7514bc74-65d4-4cf0-a0df-3de016824345