Javascript 无法获取输入类型=“文件”的值？
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Can't get value of input type="file"?
提问by Danpe
I have a <input type="file" id="uploadPicture" value="123">
我有一个 <input type="file" id="uploadPicture" value="123">
When I'm using: alert($("#uploadPicture").val());
当我使用： alert($("#uploadPicture").val());
It alerts an empty dialog.
它会提醒一个空对话框。
采纳答案by Quentin
You can read it, but you can't setit. value="123"will be ignored, so it won't have a value until you click on it and pick a file.
你可以读取它，但你不能设置它。value="123"将被忽略，因此在您单击它并选择一个文件之前它不会有任何值。
Even then, the value will likely be mangled with something like c:\fakepath\to keep the details of the user's filesystem private.
即便如此，该值也可能会被破坏，例如c:\fakepath\将用户文件系统的详细信息保密。
回答by Dmitry Vyprichenko
回答by Naresh.P
You can get it by using document.getElementById();
您可以使用 document.getElementById(); 获取它。
var fileVal=document.getElementById("some Id");
alert(fileVal.value);
will give the value of file,but it gives with fakepath as follows
将给出文件的值，但它给出了 fakepath 如下
c:\fakepath\filename
回答by Hyman Marchetti
$('input[type=file]').val()
That'll get you the file selected.
这会让你选择文件。
However, you can't set the value yourself.
但是，您不能自己设置该值。
回答by marcosfromero
You can't set the valueof a fileinput in the markup, like you did with value="123".
你不能设置value一个的file输入标记，像你这样做value="123"。
This example shows that it really works: http://jsfiddle.net/marcosfromero/7bUba/
这个例子表明它确实有效：http: //jsfiddle.net/marcosfromero/7bUba/
回答by Bozidar Sikanjic
It's old question but just in case someone bump on this tread...
这是个老问题，但以防万一有人踩到这个踏板......
var input = document.getElementById("your_input");
var file = input.value.split("\");
var fileName = file[file.length-1];
No need for regex, jQuery....
不需要正则表达式，jQuery ....
回答by Md Shahriar
don't give this in file input value="123".
不要在文件输入值=“123”中给出这个。
$(document).ready(function(){
var img = $('#uploadPicture').val();
});
