插入位置/选择DIV,Textbox,Textarea等

Question

是否存在从不同元素在每个浏览器中获取插入位置和/或选择的完整解决方案.我正在寻找一个我可以执行的解决方案,例如mGetCaretPosition(iControl)将返回其内部元素的插入位置.

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document.selection.createRange().text这样的方法不会返回插入位置,因为它没有选择.设置tRange.moveStart('character', - X)时,X不是已知值.当你在div中使用它并且插入符号位于中间时它会占用div之前的代码.

Answer 1

我今天已经构建了这个。这是您的回复亚历克斯和谷歌内所有其他结果的组合。我已经在 PC 上的 IE9、Chrome、Opera、Safari 和 Firefox 浏览器中进行了测试，也在 Android 的 HTC Sensation 上使用默认浏览器 Firefox、Chrome 和 Opera 进行了测试。

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;
    }
}