Input tag type file
Question
How to import file to the input tag (default.jpeg for example) if user does not select the file, I want to get the file from the input tag in JS and pass it to the server then get it and load. Now It works, but I can only get the file when user select itself, but when user does not select the file, I got error on the server, because the method want the file and that is why I want to load the default file to the input tag before user select any.
2 answers
solution1
0 2018-10-24 04:51:23
做这个：
document.querySelector("input[type='file']").value = "default.jpeg";
solution2
0 2018-10-24 05:42:33
You can't.
The only way to set the value of a file input is by the user to select a file.
This is done for security reasons. Otherwise, you would be able to create a Javascript that automatically uploads a specific file from the client's computer.
But if you want to do it forcefully you can do it like that.
<!DOCTYPE html>
<html>
<body>
Name: <input type="file" id="myText" value="Mickey">
<p>Click the button to display the default value of the text field.</p>
<button type="button" onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myText").defaultValue="default.jpeg";
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>
Hope it will help you in your case.
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