在JavaScript中，我可以让一个“点击”事件火的文件输入元素编程?

我想通过编程方式在<input type="file">标记上生成一个点击事件。

仅仅调用click()似乎没有做任何事情，或者至少它不会弹出一个文件选择对话框。

我一直在尝试使用侦听器捕获事件并重定向事件，但我还不能像某人点击它那样实际执行事件。

当前回答

要做到这一点，你可以点击文件输入上的一个不可见的传递元素:

function simulateFileClick() {
  const div = document.createElement("div")
  div.style.visibility = "hidden"
  div.style.position = "absolute"
  div.style.width = "100%"
  div.style.height = "100%"
  div.style.pointerEvents = "none"
  const fileInput = document.getElementById("fileInput") // or whatever selector you like
  fileInput.style.position = "relative"
  fileInput.appendChild(div)
  const mouseEvent = new MouseEvent("click")
  div.dispatchEvent(mouseEvent)
}

2021-07-23 09:21:02

其他回答

JS fiddle.net/eyedean/1bw357kw/

popFileSelector = function() { var el = document.getElementById("fileElem"); if (el) { el.click(); } }; window.popRightAway = function() { document.getElementById('log').innerHTML += 'I am right away!<br />'; popFileSelector(); }; window.popWithDelay = function() { document.getElementById('log').innerHTML += 'I am gonna delay!<br />'; window.setTimeout(function() { document.getElementById('log').innerHTML += 'I was delayed!<br />'; popFileSelector(); }, 1000); }; <body> <form> <input type="file" id="fileElem" multiple accept="image/*" style="display:none" onchange="handleFiles(this.files)" /> </form> <a onclick="popRightAway()" href="#">Pop Now</a> <br /> <a onclick="popWithDelay()" href="#">Pop With 1 Second Delay</a> <div id="log">Log: <br /></div> </body>

2014-10-31 18:35:44

我的解决方案Safari与jQuery和jQuery-ui:

$("<input type='file' class='ui-helper-hidden-accessible' />").appendTo("body").focus().trigger('click');

2012-03-07 17:42:10

要做到这一点，你可以点击文件输入上的一个不可见的传递元素:

function simulateFileClick() {
  const div = document.createElement("div")
  div.style.visibility = "hidden"
  div.style.position = "absolute"
  div.style.width = "100%"
  div.style.height = "100%"
  div.style.pointerEvents = "none"
  const fileInput = document.getElementById("fileInput") // or whatever selector you like
  fileInput.style.position = "relative"
  fileInput.appendChild(div)
  const mouseEvent = new MouseEvent("click")
  div.dispatchEvent(mouseEvent)
}

2021-07-23 09:21:02

$(document).one('mousemove', function() { $(element).trigger('click') } );

当我遇到类似的问题时，它为我工作，是一个普通的eRube Goldberg。

2012-10-10 15:08:15

对于那些知道你必须在链接上覆盖一个看不见的表单，但懒得写的人，我为你写了它。对我来说是，但还是分享吧。欢迎提出意见。

HTML(某处):

<a id="fileLink" href="javascript:fileBrowse();" onmouseover="fileMove();">File Browse</a>

HTML(你不关心的地方):

<div id="uploadForm" style="filter:alpha(opacity=0); opacity: 0.0; width: 300px; cursor: pointer;">
    <form method="POST" enctype="multipart/form-data">
        <input type="file" name="file" />
    </form>
</div>

JavaScript:

function pageY(el) {
    var ot = 0;
    while (el && el.offsetParent != el) {
        ot += el.offsetTop ? el.offsetTop : 0;
        el = el.offsetParent;
    }
    return ot;
}

function pageX(el) {
    var ol = 0;
    while (el && el.offsetParent != el) {
        ol += el.offsetLeft ? el.offsetLeft : 0;
        el = el.offsetParent;
    }
    return ol;
}

function fileMove() {
    if (navigator.appName == "Microsoft Internet Explorer") {
        return; // Don't need to do this in IE. 
    }
    var link = document.getElementById("fileLink");
    var form = document.getElementById("uploadForm");
    var x = pageX(link);
    var y = pageY(link);
    form.style.position = 'absolute';
    form.style.left = x + 'px';
    form.style.top = y + 'px';
}

function fileBrowse() {
    // This works in IE only. Doesn't do jack in FF. :( 
    var browseField = document.getElementById("uploadForm").file;
    browseField.click();
}

2010-08-24 00:36:13

在JavaScript中，我可以让一个“点击”事件火的文件输入元素编程?

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