一. 获取光标位置：
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// 获取光标位置
function getCursortPosition (textDom) {
var cursorPos = 0;
if (document.selection) {
// IE Support
textDom.focus ();
var selectRange = document.selection.createrange();
selectRange.moveStart ('character',-textDom.value.length);
cursorPos = selectRange.text.length;
}else if (textDom.selectionStart || textDom.selectionStart == '0') {
// Firefox support
cursorPos = textDom.selectionStart;
}
return cursorPos;
}
二. 设置光标位置：
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// 设置光标位置
function setCaretPosition(textDom,pos){
if(textDom.setSelectionRange) {
// IE Support
textDom.focus();
textDom.setSelectionRange(pos,pos);
}else if (textDom.createTextRange) {
// Firefox support
var range = textDom.createTextRange();
range.collapse(true);
range.moveEnd('character',pos);
range.moveStart('character',pos);
range.select();
}
}
三. 获取选中文字：
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// 获取选中文字
function getSelectText() {
var userSelection,text;
if (window.getSelection) {
// Firefox support
userSelection = window.getSelection();
} else if (document.selection) {
// IE Support
userSelection = document.selection.createrange();
}
if (!(text = userSelection.text)) {
text = userSelection;
}
return text;
}
四. 选中特定范围的文本：
textLength){
startPos = textLength;
}
if(endPos > textLength){
endPos = textLength;
}
if(startPos < 0){
startPos = textLength + startPos;
}
if(endPos < 0){
endPos = textLength + endPos;
}
if(textDom.createTextRange){
// IE Support
var range = textDom.createTextRange();
range.moveStart("character",-textLength);
range.moveEnd("character",-textLength);
range.moveStart("character",startPos);
range.moveEnd("character",endPos);
range.select();
}else{
// Firefox support
textDom.setSelectionRange(startPos,endPos);
textDom.focus();
}
}
}
五. 在光标后插入文本：
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/**
* 在光标后插入文本
* 参数：
* textDom [JavaScript DOM String] 当前对象
* value [String] 要插入的文本
*/
function insertAfterText(textDom,value) {
var selectRange;
if (document.selection) {
// IE Support
textDom.focus();
selectRange = document.selection.createrange();
selectRange.text = value;
textDom.focus();
}else if (textDom.selectionStart || textDom.selectionStart == '0') {
// Firefox support
var startPos = textDom.selectionStart;
var endPos = textDom.selectionEnd;
var scrollTop = textDom.scrollTop;
textDom.value = textDom.value.substring(0,startPos) + value + textDom.value.substring(endPos,textDom.value.length);
textDom.focus();
textDom.selectionStart = startPos + value.length;
textDom.selectionEnd = startPos + value.length;
textDom.scrollTop = scrollTop;
}
else {
textDom.value += value;
textDom.focus();
}
}
