在contenteditable中替换特定单词

Question

我有一个满足的div

<div id="divTest" contenteditable="true">

我需要从插入位置得到最后一个字,在某些情况下我必须测试并删除这个特定字.以下是我的表现

$('#divTest').on('keyup focus', function (e) {
           if (e.keyCode == 32) {
               var lastWord = getWordPrecedingCaret(this),                                       spanLastWord = $('#lastWord');

           }
       });

function getWordPrecedingCaret(containerEl) {
               var preceding = "",
                                    sel,
                                    range,
                                    precedingRange;
               if (window.getSelection) {
                   sel = window.getSelection();
                   if (sel.rangeCount > 0) {
                       range = sel.getRangeAt(0).cloneRange();
                       range.collapse(true);
                       range.setStart(containerEl, 0);
                       preceding = range.toString();


                   }
               } else if ((sel = document.selection) && sel.type != "Control") {
                   range = sel.createRange();
                   precedingRange = range.duplicate();
                   precedingRange.moveToElementText(containerEl);
                   precedingRange.setEndPoint("EndToStart", range);
                   preceding = precedingRange.text;
               }

               var words = range.toString().trim().split(' '),
                        lastWord = words[words.length - 1];
                  if (lastWord) {

                   var resultValue = 'some'; // this value is coming from some other function
                   if (resultValue == lastWord) {
                     alert('do nothing');
                       // do nothing
                   }
                 else
                   {
                     alert('replace word');
                     // delete That specific word and replace if with resultValue
                   }
                   return lastWord;

               }
           }

演示:http://codepen.io/anon/pen/ogzpXV

我尝试过range.deleteContents(); 但这将删除div中的所有内容.我怎样才能替换特定单词？

Answer 1

要使用,Ranges我们需要记住,我们正在使用节点,而不仅仅是渲染的文本.您想要操纵的结构是:

<div id="divTest" contenteditable="true"> <-- Element Node
    "some text" <-- TextNode
</div>

但它也可能是:

<div id="divTest" contenteditable="true"> <-- Element Node
    "some text" <-- TextNode
    "more text" <-- TextNode
    "" <-- TextNode
</div>

为了解决你的问题更简单,只处理一个TextNode,我建议使用该normalize()函数将所有这些函数连接成一个.

然后你只需要设置Range之前的单词边界deleteContents().删除后,您可以TextNode使用替换插入新的替换insertNode().

var wordStart = range.toString().lastIndexOf(lastWord);
var wordEnd = wordStart + lastWord.length;

/* containerEl.firstChild refers to the div's TextNode */                   
range.setStart(containerEl.firstChild, wordStart);
range.setEnd(containerEl.firstChild, wordEnd);
range.deleteContents();
range.insertNode(document.createTextNode(resultValue));

为此,您需要将文本放在一个单独的文本中TextNode.但经过ìnsertNode了div将包含多个文本节点.要解决此问题,只需调用normalize()即可加入所有TextNode元素.

containerEl.normalize();

编辑:

正如Basj指出的那样,原始解决方案无法用于多线.那是因为当按下ENTER时,结构会改变:

<div id="divTest" contenteditable="true"> <-- Element Node
    "some text" <-- TextNode
</div>

类似于:

<div id="divTest" contenteditable="true"> <-- Element Node
    <div>"some text"</div>
    <div>"more text"</div>
</div>

我已经更新了这个答案,但是也值得在这个问题上阅读Basj的答案:在光标前替换单词,当多个行在contenteditable

JSFiddle演示或可运行的代码片段:

document.getElementById('divTest').onkeyup = function (e) {
    if (e.keyCode == 32) {
        getWordPrecedingCaret(this);
    }
};

function getWordPrecedingCaret(containerEl) {
    var preceding = "",
        sel,
        range,
        precedingRange;
    if (window.getSelection) {
        sel = window.getSelection();
        if (sel.rangeCount > 0) {
            range = sel.getRangeAt(0).cloneRange();
            range.collapse(true);
            range.setStart(containerEl, 0);
            preceding = range.toString();
        }
    } else if ((sel = document.selection) && sel.type != "Control") {
        range = sel.createRange();
        precedingRange = range.duplicate();
        precedingRange.moveToElementText(containerEl);
        precedingRange.setEndPoint("EndToStart", range);
        preceding = precedingRange.text;
    }

    var words = range.toString().trim().split(' '),
        lastWord = words[words.length - 1];
        
    if (lastWord) {
        var resultValue = 'some'; // this value is coming from some other function
        if (resultValue == lastWord) {
            console.log('do nothing: ' + lastWord);
            // do nothing
        } else {
            console.log('replace word ' + lastWord);
            
            /* Find word start and end */
            var wordStart = range.endContainer.data.lastIndexOf(lastWord);
            var wordEnd = wordStart + lastWord.length;
            console.log("pos: (" + wordStart + ", " + wordEnd + ")");
                           
            range.setStart(range.endContainer, wordStart);
            range.setEnd(range.endContainer, wordEnd);
            range.deleteContents();
            range.insertNode(document.createTextNode(resultValue));
            // delete That specific word and replace if with resultValue

            /* Merge multiple text nodes */            
            containerEl.normalize();
        }
        return lastWord;
    }
}

<div id="divTest" contenteditable="true">Write words here and hit SPACE BAR</div>