如何更新type = file [英] how to update type=file

问题描述

如何更新type = file

how to update type=file

这些行在我的更新文件中.这个作品.它呼应$ row，我可以更改它，也可以随它去.

These lines are in my update file. This one works. It echos the $row and i can change it or let it be.

<textarea  cols="25" rows="5" name="bio" ><?php echo $row['bio']?> </textarea> </tr></td>

现在我的问题是，我如何使用type ="file"来获得相同的效果?

Now my question is, how can i get the same thing work with an type="file" ?

<input type="file" name="img" accept="image/jpg,image/gif,image/png" /></tr></td>

推荐答案

由于浏览器安全性原因，您不能这样做.

You cannot do that due to browser security reasons.

但是您还可以做其他事情.

在文件上传字段下方显示上传的图片.如果用户要更改它，请让他上传另一张图片，否则将其留空.

Display the uploaded pic below the file upload field.If the user wants to change it , let him upload another pic or else just leave it blank.

在服务器端，只需检查该字段是否为空，然后执行必要的操作即可.

In the server-side just check if the field is blank or not and do the necessary action.

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