用户在contenteditable div中键入时替换最后一个字符 [英] Replace last character while user typing in contenteditable div

问题描述

我在SE中的某个地方找到了一个代码，用于在Tim Down可编辑的内容中插入文本。该代码如下所示，并且运行良好。但是我想添加一个基于我的要求的条件，并想以某种方式修改代码，但经过如此多次的尝试却未能做到。

I found, somewhere in SE, a code to insert text in contenteditable by Tim Down. The code looks like the following and is working perfect. But I want to add a condition that is based on my requirement and wanted to modify the code somehow but failed to do it after so many trials.

function insertTextAtCursor(value, stepback) {
    var sel, range, textNode;
    if (window.getSelection) {
        sel = window.getSelection();
        if (sel.getRangeAt && sel.rangeCount) {
            range = sel.getRangeAt(0);         
            textNode = document.createTextNode(value);


           //Check value of stepback: 0 or 1
            if(!stepback)//if 0
                 range.insertNode(textNode);
            if(stepback){ //if 1
               // replace the previously inserted character with the new one here

            }

            // Move caret to the end of the newly inserted text node   
            range.setStart(textNode, textNode.length);
            range.setEnd(textNode, textNode.length);

            sel.removeAllRanges();
            sel.addRange(range);          

        }
    } else if (document.selection && document.selection.createRange) {
        range = document.selection.createRange();
        range.pasteHTML(text);
    }
}

这里我正在检查的值stepback 参数为0或1。如果为0，则将插入按下的字符，但如果为1，我想用新字符替换最后一个字符。在我的情况下，当立即按下一个键和一个元音（例如，先按下m再按下a）时，后退将返回1。如何修改代码以达到此条件？花了几天的时间来解决这个问题，但无济于事。

Here I am checking the value of the stepback parameter which is 0 or 1. If 0 then the pressed character will be inserted but if 1 I want to replace the last character with the new one. In my case, the stepback returns 1 when a key is pressed immediately followed by a vowel (for instance, pressing m followed by a). How can I modify the code to achieve this condition? Spent days to figure out this but to no avail.

谢谢。

推荐答案

代替以下内容：

//Check value of stepback: 0 or 1
if(!stepback)//if 0
     range.insertNode(textNode);
if(stepback){ //if 1
   // replace the previously inserted character with the new one here

}

使用以下代码：

// This clones the selected range and then selects 1
// 1 character in the backward direction and deletes it.
if(stepback){
    clone = range.cloneRange();
    clone.setStart(range.startContainer, range.startOffset - 1);
    clone.setEnd(range.startContainer, range.startOffset);
    clone.deleteContents();
}
range.insertNode(textNode);

这样可确保始终在末尾添加新的翻译字符，并有选择地删除1个字符

This ensures that the new translated character is always added at the end while optionally removing the 1 character in case stepback is required.

更新：我仅在Chromium中对此进行了测试。

UPDATE: I have tested this in Chromium only.

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