JavaScript获取剪贴板数据粘贴事件(跨浏览器)

web应用程序如何检测粘贴事件并检索要粘贴的数据?

我想在文本粘贴到富文本编辑器之前删除HTML内容。

在粘贴后清理文本是有效的，但问题是所有以前的格式都会丢失。例如，我可以在编辑器中编写一个句子并将其加粗，但当我粘贴新文本时，所有格式都会丢失。我只想清除粘贴的文本，并保留以前的任何格式不变。

理想情况下，解决方案应该可以跨所有现代浏览器(例如，MSIE、Gecko、Chrome和Safari)工作。

注意，MSIE有clipboardData.getData()，但我找不到其他浏览器的类似功能。

当前回答

解决方案，为我是添加事件监听器粘贴事件，如果你是粘贴到一个文本输入。由于粘贴事件发生在输入中的文本更改之前，在我的on粘贴处理程序中，我创建了一个延迟函数，其中我检查输入框中发生的粘贴更改:

onPaste: function() {
    var oThis = this;
    setTimeout(function() { // Defer until onPaste() is done
        console.log('paste', oThis.input.value);
        // Manipulate pasted input
    }, 1);
}

2014-01-13 06:24:09

其他回答

$('#dom').on('paste',function (e){
    setTimeout(function(){
        console.log(e.currentTarget.value);
    },0);
});

2014-03-19 09:26:28

对于清除粘贴文本和替换当前选择的文本与粘贴文本的问题是相当琐碎的:

<div id='div' contenteditable='true' onpaste='handlepaste(this, event)'>Paste</div>

JS:

function handlepaste(el, e) {
  document.execCommand('insertText', false, e.clipboardData.getData('text/plain'));
  e.preventDefault();
}

2013-10-08 17:06:39

首先想到的是谷歌的闭包库的pastehandler http://closure-library.googlecode.com/svn/trunk/closure/goog/demos/pastehandler.html

2010-02-01 13:24:19

我写了一个小的概念证明蒂姆唐斯提议这里与屏幕文本区域。下面是代码:

<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script> 
<script language="JavaScript">
 $(document).ready(function()
{

var ctrlDown = false;
var ctrlKey = 17, vKey = 86, cKey = 67;

$(document).keydown(function(e)
{
    if (e.keyCode == ctrlKey) ctrlDown = true;
}).keyup(function(e)
{
    if (e.keyCode == ctrlKey) ctrlDown = false;
});

$(".capture-paste").keydown(function(e)
{
    if (ctrlDown && (e.keyCode == vKey || e.keyCode == cKey)){
        $("#area").css("display","block");
        $("#area").focus();         
    }
});

$(".capture-paste").keyup(function(e)
{
    if (ctrlDown && (e.keyCode == vKey || e.keyCode == cKey)){                      
        $("#area").blur();
        //do your sanitation check or whatever stuff here
        $("#paste-output").text($("#area").val());
        $("#area").val("");
        $("#area").css("display","none");
    }
});

});
</script>

</head>
<body class="capture-paste">

<div id="paste-output"></div>


    <div>
    <textarea id="area" style="display: none; position: absolute; left: -99em;"></textarea>
    </div>

</body>
</html>

只需复制并粘贴整个代码到一个html文件，并尝试粘贴(使用ctrl-v)文本从剪贴板的任何地方的文档。

我在IE9和新版本的Firefox、Chrome和Opera中测试了它。工作得很好。另外，用户可以使用任何他喜欢的组合键来触发这个功能。当然，不要忘记包含jQuery源代码。

请随意使用此代码，如果您有一些改进或问题，请将它们发布回来。还要注意，我不是Javascript开发人员，所以我可能错过了一些东西(=>做你自己的测试)。

2012-05-11 12:30:13

这应该适用于所有支持onpaste事件和突变观察者的浏览器。

这个解决方案不仅仅只是获取文本，它实际上允许您在粘贴到元素之前编辑粘贴的内容。

它通过使用contentteditable, onpaste事件(所有主要浏览器支持)在突变观察者(Chrome, Firefox和IE11+支持)中工作。

步骤1

创建一个带有contentteditable的html元素

<div contenteditable="true" id="target_paste_element"></div>

步骤2

在Javascript代码中添加以下事件

document.getElementById("target_paste_element").addEventListener("paste", pasteEventVerifierEditor.bind(window, pasteCallBack), false);

我们需要绑定pasteCallBack，因为突变观察者将被异步调用。

步骤3

向代码中添加以下函数

function pasteEventVerifierEditor(callback, e)
{
   //is fired on a paste event. 
    //pastes content into another contenteditable div, mutation observer observes this, content get pasted, dom tree is copied and can be referenced through call back.
    //create temp div
    //save the caret position.
    savedCaret = saveSelection(document.getElementById("target_paste_element"));

    var tempDiv = document.createElement("div");
    tempDiv.id = "id_tempDiv_paste_editor";
    //tempDiv.style.display = "none";
    document.body.appendChild(tempDiv);
    tempDiv.contentEditable = "true";

    tempDiv.focus();

    //we have to wait for the change to occur.
    //attach a mutation observer
    if (window['MutationObserver'])
    {
        //this is new functionality
        //observer is present in firefox/chrome and IE11
        // select the target node
        // create an observer instance
        tempDiv.observer = new MutationObserver(pasteMutationObserver.bind(window, callback));
        // configuration of the observer:
        var config = { attributes: false, childList: true, characterData: true, subtree: true };

        // pass in the target node, as well as the observer options
        tempDiv.observer.observe(tempDiv, config);

    }   

}



function pasteMutationObserver(callback)
{

    document.getElementById("id_tempDiv_paste_editor").observer.disconnect();
    delete document.getElementById("id_tempDiv_paste_editor").observer;

    if (callback)
    {
        //return the copied dom tree to the supplied callback.
        //copy to avoid closures.
        callback.apply(document.getElementById("id_tempDiv_paste_editor").cloneNode(true));
    }
    document.body.removeChild(document.getElementById("id_tempDiv_paste_editor"));

}

function pasteCallBack()
{
    //paste the content into the element.
    restoreSelection(document.getElementById("target_paste_element"), savedCaret);
    delete savedCaret;

    pasteHtmlAtCaret(this.innerHTML, false, true);
}   


saveSelection = function(containerEl) {
if (containerEl == document.activeElement)
{
    var range = window.getSelection().getRangeAt(0);
    var preSelectionRange = range.cloneRange();
    preSelectionRange.selectNodeContents(containerEl);
    preSelectionRange.setEnd(range.startContainer, range.startOffset);
    var start = preSelectionRange.toString().length;

    return {
        start: start,
        end: start + range.toString().length
    };
}
};

restoreSelection = function(containerEl, savedSel) {
    containerEl.focus();
    var charIndex = 0, range = document.createRange();
    range.setStart(containerEl, 0);
    range.collapse(true);
    var nodeStack = [containerEl], node, foundStart = false, stop = false;

    while (!stop && (node = nodeStack.pop())) {
        if (node.nodeType == 3) {
            var nextCharIndex = charIndex + node.length;
            if (!foundStart && savedSel.start >= charIndex && savedSel.start <= nextCharIndex) {
                range.setStart(node, savedSel.start - charIndex);
                foundStart = true;
            }
            if (foundStart && savedSel.end >= charIndex && savedSel.end <= nextCharIndex) {
                range.setEnd(node, savedSel.end - charIndex);
                stop = true;
            }
            charIndex = nextCharIndex;
        } else {
            var i = node.childNodes.length;
            while (i--) {
                nodeStack.push(node.childNodes[i]);
            }
        }
    }

    var sel = window.getSelection();
    sel.removeAllRanges();
    sel.addRange(range);
}

function pasteHtmlAtCaret(html, returnInNode, selectPastedContent) {
//function written by Tim Down

var sel, range;
if (window.getSelection) {
    // IE9 and non-IE
    sel = window.getSelection();
    if (sel.getRangeAt && sel.rangeCount) {
        range = sel.getRangeAt(0);
        range.deleteContents();

        // Range.createContextualFragment() would be useful here but is
        // only relatively recently standardized and is not supported in
        // some browsers (IE9, for one)
        var el = document.createElement("div");
        el.innerHTML = html;
        var frag = document.createDocumentFragment(), node, lastNode;
        while ( (node = el.firstChild) ) {
            lastNode = frag.appendChild(node);
        }
        var firstNode = frag.firstChild;
        range.insertNode(frag);

        // Preserve the selection
        if (lastNode) {
            range = range.cloneRange();
            if (returnInNode)
            {
                range.setStart(lastNode, 0); //this part is edited, set caret inside pasted node.
            }
            else
            {
                range.setStartAfter(lastNode); 
            }
            if (selectPastedContent) {
                range.setStartBefore(firstNode);
            } else {
                range.collapse(true);
            }
            sel.removeAllRanges();
            sel.addRange(range);
        }
    }
} else if ( (sel = document.selection) && sel.type != "Control") {
    // IE < 9
    var originalRange = sel.createRange();
    originalRange.collapse(true);
    sel.createRange().pasteHTML(html);
    if (selectPastedContent) {
        range = sel.createRange();
        range.setEndPoint("StartToStart", originalRange);
        range.select();
    }
}
}

代码的作用:

Somebody fires the paste event by using ctrl-v, contextmenu or other means In the paste event a new element with contenteditable is created (an element with contenteditable has elevated privileges) The caret position of the target element is saved. The focus is set to the new element The content gets pasted into the new element and is rendered in the DOM. The mutation observer catches this (it registers all changes to the dom tree and content). Then fires the mutation event. The dom of the pasted content gets cloned into a variable and returned to the callback. The temporary element is destroyed. The callback receives the cloned DOM. The caret is restored. You can edit this before you append it to your target. element. In this example I'm using Tim Downs functions for saving/restoring the caret and pasting HTML into the element.

例子

非常感谢Tim Down 请看这篇文章的答案:

在粘贴事件上获取文档上的粘贴内容

2014-12-16 14:52:46

JavaScript获取剪贴板数据粘贴事件(跨浏览器)

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