在使用JavaScript / jquery的游标中插入文本

如何通过JQuery和JavaScript将一些Text插入到TextBox的当前光标位置

处理

1. 查找当前光标位置
2. 获取要复制的文本
3. 在那边设置文字
4. 更新光标位置

在这里，我有2个文本框和一个按钮。我必须单击文本框上的某个位置，然后单击按钮以将文本从另一个文本框粘贴到上一个文本框的位置。

这里的主要问题是获取当前光标位置，我们将在此处粘贴文本。

//Textbox on which to be pasted
<input type="text" id="txtOnWhichToBePasted" />

//Textbox from where to be pasted
<input type="text" id="txtFromWhichToBePasted" />


//Button on which click the text to be pasted
<input type="button" id="btnInsert" value="Insert"/>


<script type="text/javascript">

$(document).ready(function () {
    $('#btnInsert').bind('click', function () {
            var TextToBePasted = $('#txtFromWhichToBePasted').value;
            var ControlOnWhichToBePasted = $('#txtOnWhichToBePasted');

            //Paste the Text
            PasteTag(ControlOnWhichToBePasted, TextToBePasted);
        });
    });

//Function Pasting The Text
function PasteTag(ControlOnWhichToBePasted,TextToBePasted) {
    //Get the position where to be paste

    var CaretPos = 0;
    // IE Support
    if (document.selection) {

        ControlOnWhichToBePasted.focus();
        var Sel = document.selection.createRange();

        Sel.moveStart('character', -ctrl.value.length);

        CaretPos = Sel.text.length;
    }
    // Firefox support
    else if (ControlOnWhichToBePasted.selectionStart || ControlOnWhichToBePasted.selectionStart == '0')
        CaretPos = ControlOnWhichToBePasted.selectionStart;

    //paste the text
    var WholeString = ControlOnWhichToBePasted.value;
    var txt1 = WholeString.substring(0, CaretPos);
    var txt2 = WholeString.substring(CaretPos, WholeString.length);
    WholeString = txt1 + TextToBePasted + txt2;
    var CaretPos = txt1.length + TextToBePasted.length;
    ControlOnWhichToBePasted.value = WholeString;

    //update The cursor position 
    setCaretPosition(ControlOnWhichToBePasted, CaretPos);
}

function setCaretPosition(ControlOnWhichToBePasted, pos) {

    if (ControlOnWhichToBePasted.setSelectionRange) {
        ControlOnWhichToBePasted.focus();
        ControlOnWhichToBePasted.setSelectionRange(pos, pos);
    }
    else if (ControlOnWhichToBePasted.createTextRange) {
        var range = ControlOnWhichToBePasted.createTextRange();
        range.collapse(true);
        range.moveEnd('character', pos);
        range.moveStart('character', pos);
        range.select();
    }
}

</script>

function addTextAtCaret(textAreaId, text) {
    var textArea = document.getElementById(textAreaId);
    var cursorPosition = textArea.selectionStart;
    addTextAtCursorPosition(textArea, cursorPosition, text);
    updateCursorPosition(cursorPosition, text, textArea);
}
function addTextAtCursorPosition(textArea, cursorPosition, text) {
    var front = (textArea.value).substring(0, cursorPosition);
    var back = (textArea.value).substring(cursorPosition, textArea.value.length);
    textArea.value = front + text + back;
}
function updateCursorPosition(cursorPosition, text, textArea) {
    cursorPosition = cursorPosition + text.length;
    textArea.selectionStart = cursorPosition;
    textArea.selectionEnd = cursorPosition;
    textArea.focus();    
}

<div>
    <button type="button" onclick="addTextAtCaret('textArea','Apple')">Insert Apple!</button>
    <button type="button" onclick="addTextAtCaret('textArea','Mango')">Insert Mango!</button>
    <button type="button" onclick="addTextAtCaret('textArea','Orange')">Insert Orange!</button>
</div>
<textarea id="textArea" rows="20" cols="50"></textarea>

<script>
var holdFocus;

function updateFocus(x)
{
    holdFocus = x;
}

function appendTextToLastFocus(text)
{
    holdFocus.value += text;
}
</script>

<input type="textbox" onfocus="updateFocus(this)" />
<a href="#" onclick="appendTextToLastFocus('textToAppend')" />

if ($.browser.msie) 

if (br == "ie") { 

function insertAtCaret(areaId,text) {
    var txtarea = document.getElementById(areaId);
    var scrollPos = txtarea.scrollTop;
    var strPos = 0;
    var br = ((txtarea.selectionStart || txtarea.selectionStart == '0') ? 
        "ff" : (document.selection ? "ie" : false ) );

    if ($.browser.msie) { 
        txtarea.focus();
        var range = document.selection.createRange();
        range.moveStart ('character', -txtarea.value.length);
        strPos = range.text.length;
    }
    else if (br == "ff") strPos = txtarea.selectionStart;

    var front = (txtarea.value).substring(0,strPos);  
    var back = (txtarea.value).substring(strPos,txtarea.value.length); 
    txtarea.value=front+text+back;
    strPos = strPos + text.length;
    if (br == "ie") { 
        txtarea.focus();
        var range = document.selection.createRange();
        range.moveStart ('character', -txtarea.value.length);
        range.moveStart ('character', strPos);
        range.moveEnd ('character', 0);
        range.select();
    }
    else if (br == "ff") {
        txtarea.selectionStart = strPos;
        txtarea.selectionEnd = strPos;
        txtarea.focus();
    }
    txtarea.scrollTop = scrollPos;
}

element.setRangeText('abc');

element.setRangeText('abc', 3, 5);