在textarea或contenteditable div中键入TAB时检测最后写入的单词 [英] Detect the last written word when typing TAB in a textarea or contenteditable div

问题描述

在 textarea 或contenteditable 中按下 TAB 时如何检测并选择最后写入的单词div ？

我开始用写入或按键的最后一个字符的缓冲区来做，但后来我注意到有多个案例：

• 假设用户写入 H E → → û BACKSPACE 0




• 用户使用箭头键移动




• 用户可以用 SPACE 分隔单词这就是我使用的），但也 ENTER 或逗号等。

有一个很好的方法来检测最后的文字？

目标：为自动完成功能编码，例如： thx +< TAB> code> =>文本被替换为非常感谢你。


解决方案

$ c> textarea 和 contenteditable div：

data-console =truedata-babel =false>

< div contenteditable> Hello ，按Tab键替换这个WORD< br>在此ONE之后也按TAB< / div>< textarea rows =8cols =50id =a>您好，按Tab键替换此WORDA并按TAB在此之后< / textarea>

How to detect and select the last written word when TAB is pressed in a textarea or contenteditable div?

I started to do it with a buffer of the last characters written or key-presses, but then I noticed that there are multiple corner cases:

• let's say the user writes HELLUBACKSPACEO

• the user moves with arrow keys

• the user can separate words with SPACE (that's what I was using) but also ENTER or a comma, etc.

Is there a nice way to detect the last written word?

Goal: to code an autocomplete feature, example: thx + <TAB> => Text is replaced by "Thank you very much."

解决方案

This totally works for textarea and for contenteditable div:

var newText = 'hello\nnewline';
var newHtml = '<b>test</b> and<br>a <a href="hjkh">link</a>';

document.addEventListener("keydown", function(e) {
    var elt = e.target;
    if (elt.tagName.toLowerCase() === 'textarea' || elt.isContentEditable)
    {        
        if (e.keyCode == 9) {
            e.preventDefault();
            if (elt.isContentEditable) {  // for contenteditable
                elt.focus();
                sel = document.getSelection();
                sel.modify("extend", "backward", "word");
                range = sel.getRangeAt(0);
                console.log(range.toString().trim());
                range.deleteContents();
                var el = document.createElement("div");
                el.innerHTML = newHtml;
                var frag = document.createDocumentFragment(), node;
                while (node = el.firstChild) {
                    frag.appendChild(node);
                }
                range.insertNode(frag);
                range.collapse();
            } else {  // for texterea/input element
                var endingIndex = elt.selectionStart;
                var startingIndex = endingIndex && endingIndex - 1;
                var value = elt.value;
                var regex = /[ ]/;
                while (startingIndex > -1) {
                    if (regex.test(value[startingIndex])) {
                        ++startingIndex;
                        break;
                    }
                    --startingIndex;
                }
                if (startingIndex < 0) {
                    startingIndex = 0;
                }
                value = value.substring(0, startingIndex) + newText + value.substring(endingIndex);
                var cursorPosition = startingIndex + newText.length;
                e.target.value = value;
                e.target.setSelectionRange(cursorPosition, cursorPosition);
            }
        }
    }
});

<div contenteditable>Hello, press TAB to replace this WORD<br>Also press TAB after this ONE</div>
<textarea rows="8" cols="50" id="a">Hello, press TAB to replace this WORD
Also press TAB after this ONE</textarea>

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