js编辑器--主要实现(获得光标位置)(获得选中文本)
作者:互联网
1.判断光标是否选中文本
// 获取选中文本 getSelectedText() { if (window.getSelection) { return window.getSelection().toString(); } else if (document.selection) { //ie浏览器兼容 return document.selection.createRange().text; } return ''; },
2.获得富文本框中光标的位置
//我项目中这么写的
this.range = window.getSelection().getRangeAt(0);
//网上搜的兼容写法
function getCursortPosition(element) { var doc = element.ownerDocument || element.document; var win = doc.defaultView || doc.parentWindow; var sel; if (typeof win.getSelection != "undefined") { sel = win.getSelection(); if (sel.rangeCount > 0) { var range = win.getSelection().getRangeAt(0); console.log(range); } } return range; }
//element为富文本挂载的dom元素,返回的range为光标对应的位置
**如果调用range的insertNode方法,可以在光标对应的位置插入想要的dom元素,但是这里要注意的是,insertNode方法会把你插入的dom元素,里面父子关系的节点元素循环成兄弟节点插入到光标位置。
//https://www.cnblogs.com/xzhwill19900525/p/8608996.html
3.项目编辑器主要插入实现:
insertMethod(clickEvent) { if (window.getSelection().type == 'None') { console.log('页面编辑器中没有光标的时候', window.getSelection().type); return; }if (this.clickArea <= 0) { console.log('光标不在富文本中,不做处理'); return; }if (document.querySelector('#insertBlock')) return;
//获取光标位置,存在range中 this.range = window.getSelection().getRangeAt(0); if (this.getSelectedText().trim()) { console.log('此时有选中文本,划选插入'); var cloneCotext = this.range.cloneContents().children; var newArr = []; var childrenNodes = []; if (cloneCotext.length) { for (var i in cloneCotext) { newArr.push(cloneCotext[i]); if (cloneCotext[i].childNodes?.length) { console.log(cloneCotext[i].childNodes); Object.assign(childrenNodes, cloneCotext[i].childNodes); } } } let re = newArr.some(item => { return item.tagName == 'ACTION'; }); let rechild = childrenNodes.some(item => { return item.tagName == 'ACTION'; }); if (re || rechild) { this.$message.error('划选内容非法,请重新选择'); return false; } document.getElementById('editorContainer').focus();
//选中文本存在selectedText中 this.selectedText = this.getSelectedText().trim(); let domB = document.createElement('b'); domB.setAttribute('id', 'insertBlock'); domB.setAttribute('style', 'background:green;width:5px;height: 1.75em;display: inline-block;'); let domSpan = document.createElement('i'); domSpan.setAttribute('id', 'inertSelect'); domSpan.appendChild(this.range.extractContents()); this.range.insertNode(domB); this.range.insertNode(domSpan); insertContClick.style.zIndex = -1;
//显示划选选择框 this.setSelectStyle(clickEvent.clientX, clickEvent.clientY); } else { document.getElementById('editorContainer').focus(); console.log('没有选择文本,是点插入', this.range.startContainer);
let domB = document.createElement('b'); domB.setAttribute('id', 'insertBlock'); domB.setAttribute('style', 'background:green;width:5px;height: 1.75em;display: inline-block;'); this.range.insertNode(domB); insertContSelect.style.zIndex = -1;
//显示点选择框 this.setClickStyle(clickEvent.clientX, clickEvent.clientY); } },
标签:return,--,getSelection,range,js,编辑器,var,document,domB 来源: https://www.cnblogs.com/liAnran/p/13597564.html