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