9

是否有从不同元素在每个浏览器中获取插入符号位置和/或选择的整体解决方案。我正在寻找一个我可以执行的解决方案，例如 mGetCaretPosition(iControl) 女巫将返回其元素内的插入符号位置。

我尝试了很多功能：

  • selection (window/document) [document=IE, window=Opera]
  • getSelection (window/document) [document=Firefox, document=Chrome, document=Safari]
  • selectionStart (input/textarea) [All]
  • craeteRange (selection)
  • createTextRange (selection)


调用像 document.selection.createRange().text 这样的方法不会返回插入符号位置，因为它没有选择。设置 tRange.moveStart('character', -X) 时，X 不是已知值。当您在 div 中使用它并且插入符号位于中间时，它会将代码放在 div 之前。

4

1 回答 1

3

我今天已经建立了这个。这是你的回应亚历克斯和谷歌内部其他结果的组合。我已经在 PC 上的浏览​​器 IE9、Chrome、Opera、Safari 和 Firefox 以及带有默认浏览器 Firefox、Chrome 和 Opera 的 Android 的 HTC Sensation 上测试了它。

只有移动设备上的 Opera 确实存在一些问题。

我的解决方案： 

// Control
var BSControl = function(iControl)
{
    // Variable
    var tControl = (typeof iControl == 'string' ? document.getElementById(iControl) : iControl);

    // Get Caret
    this.mGetCaret = function()
    {
        // Resultaat aanmaken
        var tResult = -1;

        // SelectionStart
        // *) Input & Textarea
        if(tResult == -1 && (tControl.selectionStart || tControl.selectionStart == '0'))
        {
            tResult = tControl.selectionStart;
        }

        // ContentWindow.GetSelection
        // *) IFrame
        if(tResult == -1 && (tControl.contentWindow && tControl.contentWindow.getSelection))
        {
            var tRange= tControl.contentWindow.getSelection().getRangeAt(0); 
            tResult = tRange.startOffset;
        }

        // GetSelection
        // *) Div
        if(tResult == -1 && (window.getSelection))
        {
            var tRange= window.getSelection().getRangeAt(0); 
            tResult = tRange.startOffset;
        }

        // Resultaat teruggeven
        return tResult;
    }

    // Set Caret
    this.mSetCaret = function(iPosition)
    {
        // SelectionStart
        // *) Input & Textarea
        if(tControl.selectionStart || tControl.selectionStart == '0')
        {
            tControl.selectionStart = iPosition;
            tControl.selectionEnd = iPosition;
            return;
        }

        // ContentWindow.GetSelection
        // *) IFrame
        if(tControl.contentWindow && tControl.contentWindow.getSelection)
        {
            var tRange = tControl.contentDocument.createRange();
            tRange.setStart(tControl.contentDocument.body.firstChild, iPosition);
            tRange.setEnd(tControl.contentDocument.body.firstChild, iPosition);

            var tSelection = tControl.contentWindow.getSelection();
            tSelection.removeAllRanges();
            tSelection.addRange(tRange);

            return;
        }

        // GetSelection
        // *) Div
        if(window.getSelection)
        {
            var tSelection = window.getSelection();
            var tRange= tSelection.getRangeAt(0); 

            tRange.setStart(tControl.firstChild, iPosition);
            tRange.setEnd(tControl.firstChild, iPosition);

            tSelection.removeAllRanges();
            tSelection.addRange(tRange);

            return;
        }
    }

    // Get Selection
    this.mGetSelection = function()
    {
        // Resultaat aanmaken
        var tResult = null;

        // SelectionStart
        // *) Input & Textarea
        if(tResult == null && (tControl.selectionStart || tControl.selectionStart == '0'))
        {
            tResult = this.mGet().substring(tControl.selectionStart, tControl.selectionEnd);
        }

        // ContentWindow.GetSelection
        // *) IFrame
        if(tResult == null && (tControl.contentWindow && tControl.contentWindow.getSelection))
        {
            var tSelection = tControl.contentWindow.getSelection() 
            tResult = tSelection.toString();
        }

        // GetSelection
        // *) Div
        if(tResult == null && (window.getSelection))
        {
            var tSelection = window.getSelection() 
            tResult = tSelection.toString();
        }

        // Resultaat teruggeven
        return tResult;
    }

    // Set Selection
    this.mSetSelection = function(iFrom, iUntil)
    {
        // SelectionStart
        // *) Input & Textarea
        if(tControl.selectionStart || tControl.selectionStart == '0')
        {
            tControl.selectionStart = iFrom;
            tControl.selectionEnd = iUntil;
            return;
        }

        // ContentWindow.GetSelection
        // *) IFrame
        if(tControl.contentWindow && tControl.contentWindow.getSelection)
        {
            var tRange = tControl.contentDocument.createRange();
            tRange.setStart(tControl.contentDocument.body.firstChild, iFrom);
            tRange.setEnd(tControl.contentDocument.body.firstChild, iUntil);

            var tSelection = tControl.contentWindow.getSelection();
            tSelection.removeAllRanges();
            tSelection.addRange(tRange);

            return;
        }

        // GetSelection
        // *) Div
        if(window.getSelection)
        {
            var tSelection = window.getSelection();
            var tRange= tSelection.getRangeAt(0); 

            tRange.setStart(tControl.firstChild, iFrom);
            tRange.setEnd(tControl.firstChild, iUntil);

            tSelection.removeAllRanges();
            tSelection.addRange(tRange);

            return;
        }
    }

    // Set
    this.mSet = function(iValue)
    {
        // Afhankelijk van aanwezige property waarde instellen
        if('value' in tControl)
        {
            tControl.value = iValue;
        }else if('innerText' in tControl)
        {
            tControl.innerText = iValue;
        }else if('textContent' in tControl)
        {
            tControl.textContent = iValue;
        }else if('innerHTML' in tControl)
        {
            tControl.innerHTML = iValue;
        }
    }

    // Get
    this.mGet = function()
    {
        // Resultaat aanmaken
        var tResult = null;

        // Afhankelijk van aanwezige property waarde instellen
        if('value' in tControl)
        {
            tResult = tControl.value;
        }else if('innerText' in tControl)
        {
            tResult = tControl.innerText;
        }else if('textContent' in tControl)
        {
            tResult = tControl.textContent;
        }else if('innerHTML' in tControl)
        {
            tResult = tControl.innerHTML;
        }

        // Resultaat teruggeven
        return tResult;
    }
}
于 2012-10-23T10:28:50.777 回答