write data into <input type="file"> using js_问答_开发者

write data into <input type="file"> using js

开发者 https://www.devze.com 2023-01-02 19:52 出处：网络

I\'m trying to assign the value of <input type=\"file\" id=\"field1\"> to <input type=\"file\" id=\"field2\">.

相关专题：javascript

I'm trying to assign the value of <input type="file" id="field1"> to <input type="file" id="field2">.

I'm having the following code but it is not working as expected:

<script type="text/javascript"> 
function test(){
   var field_value = document.getElementById('file1'开发者_StackOverflow).value;
   document.getElementById('file2').value = field_value;
}
</script>
<body>
  <input type="file" onchange="test()" id="file1"/>
  <input type="file" id="file2"/>
</body>

Explanation: When I click on the browse field of file field having id="file1" it calls test() function. Variable field_value is having the name of the file uploaded. But it is not assigning the value to file field having id="file2".

For security reasons you cannot access the file controls with Javascript (imagine if you could automatically upload any file you want when the user visits a page!)

Having said that, the newest version of Firefox has a new File API, which might help you for that specific browser. And there are various File controls introduced in HTML5, but it will be a long time before you can use them.

You cannot get nor set the value of an <input type="file" > in Javascript.