Opera中的输入类型文件 [英] input type file in Opera

问题描述

我尝试在文件输入上触发onkeydown，onkeypress和onkeyup事件(例如，当元素处于焦点状态并且按下某个键时，不会触发事件)，但是它们在Opera中不起作用.用jQuery触发'click'也不起作用(例如$('#myFileinput').Click()或$('#myFileinput').trigger('click')).

I have tried to fire onkeydown, onkeypress and onkeyup events on file input(e.g. when the element is on focus and a key is pressed the events are not fired), but they doesn't work in Opera. Firing 'click' with jQuery , doesn't work too (e.g. $('#myFileinput').Click() or $('#myFileinput').trigger('click')).

是否可以在Opera中触发这些事件?

Is there a way to trigger these events in Opera ?

这是我的代码:

 <input type="file" class="foo" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.0/jquery.min.js"></script>
<script type="text/javascript">
    debugger;
    window.onload = onPageLoad;
    function onPageLoad() {

        var input = $(".foo");
        debugger;
        input.keydown(function () {
            //doesn't work in Opera
            alert("keydown");
        });

        input.keypress(function () {
            //doesn't work in Opera
            alert("keypress");
        });

        input.keyup(function () {
            //doesn't work in Opera 
            alert("keyup");
        })
    }

    window.onkeydown = function () {
        //when the focus is on the input the code bellow doesn't fire
        alert("window key down")

    }

</script>

推荐答案

由于安全策略的缘故，Opera在输入type = file上触发的事件受到限制.另外，在新的Opera版本中，专注于输入的内容会弹出一个文件对话框，因此无论如何都不会触发任何键事件.如果您需要知道值何时更改，请侦听change事件.

Due to security policies, it is limited what events Opera fires on an input type=file. Also, in new Opera versions focusing the input will bring up a file dialog, so no key events would ever fire on the input anyway. If you need to know when the value changes, listen for the change event.

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