使用敲除js上传文件 [英] file upload using knockout js

问题描述

使用敲除js无法上传文件.我已经尝试使用以下代码，但无法正常工作.请提及我在哪里做错了.

File upload not working using knockout js. I have tried with below code but not working. Please mention where I am doing wrong.

这是我的文件控件和按钮.我无法将所选文件从客户端发送到服务器.请提出最好的方法是什么.

This is my file control and button. I am unable to send the selected file from the client side to the server. Please suggest what is the best approach for this.

<input id="files" name="files" type="file" class="input-file" data-bind="file: FileProperties.FileName"/> 
<button data-bind="click : Upload">Upload</button>

<script type="text/javascript">

    ko.bindingHandlers.file = {
        init: function (element, valueAccessor) {
            alert('init');
            $(element).change(function () {
                var file = this.files[0];
                if (ko.isObservable(valueAccessor())) {
                    valueAccessor()(file);
                }
            });
        }
</script>

推荐答案

我为当前项目想出了这个解决方案.

I came up with this solution for my current project.

<img class="myImage" data-bind="attr: {src: $root.photoUrl() || 'images/tempImage.png'}"/>
<input data-bind="event: {change: $root.fileUpload}" type="file" accept="image/*" class="fileChooser"/>

<script>
var myController = function()
{
    var self = this;
    this.photoUrl = ko.observable();      
    this.fileUpload = function(data, e)
    {
        var file    = e.target.files[0];
        var reader  = new FileReader();

        reader.onloadend = function (onloadend_e) 
        {
           var result = reader.result; // Here is your base 64 encoded file. Do with it what you want.
           self.photoUrl(result);
        };

        if(file)
        {
            reader.readAsDataURL(file);
        }
    };
};
</script>

这篇关于使用敲除js上传文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！