CodeMirror sql智能提示功能修改

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CodeMirror sql部分智能提示关键字,老板希望可以自己加提示,还能支持库.表.字段下面我就说下我具体的做法：

第一步了解 codemirror的实现原理，

看这个很容易看出点啥，codemirror.js 主要是框架和配置类，show-hint.js 主要是显示提示框的类；

剩下的sql.js是规定了一些常用关键字，好吧其实我们可以在这里改，做下扩展嘛。我选择的是下一个sql-hint.js

第二步看下我写的sql-hint.js吧：

sql-hint.js

/** * 2016/03/22 yc 重写sql-hint.js * @param {Object} mod */(function(mod) {if (typeof exports == "object" && typeof module == "object") // CommonJSmod(require("../../lib/codemirror"), require("../../mode/sql/sql"));else if (typeof define == "function" && define.amd) // AMDdefine(["../../lib/codemirror", "../../mode/sql/sql"], mod);else // Plain browser envmod(CodeMirror);})(function(CodeMirror) {"use strict";var Pos = CodeMirror.Pos;    /**     * 从sql.js里获取keyword数组     * @param {Object} editor     */function getKeywords(editor) {var mode = editor.doc.modeOption;if (mode === "sql") mode = "text/x-sql";return CodeMirror.resolveMode(mode).keywords;};    /**     * 判断元素item是否存在数组arr中       * @param {Object} arr     * @param {Object} item     */function arrayContains(arr, item) { // 判断元素item是否存在数组arr中  if (!Array.prototype.indexOf) {var i = arr.length;while (i--) {if (arr[i] === item) {return true;}}return false;}return arr.indexOf(item) != -1;};    function hintSql(editor, keywords, tableKeywords, getToken, options) { // 处理hint的核心函数，改名为velocityHint(也可以不做修改)  // Find the token at the cursor，获取当前光标指定的字符串  var cur = editor.getCursor(),token = getToken(editor, cur),tprop = token;return {list: getCompletions(token, keywords, tableKeywords, options),from: Pos(cur.line, fetchStartPoint(token)), // 字符串拼接的初始位置，这个很重要  to: Pos(cur.line, token.end)};};    /**     * 字符拼接位置     * @param {Object} token     */function fetchStartPoint(token) {var index = token.string.lastIndexOf("\.");if (index < 0) {return token.start;} else {return token.start + index + 1;}//return token.start;};function sqlHint(editor, options) {var keywords = wordToString(getKeywords(editor)) + CodeMirror.keywords;return hintSql(editor, keywords, CodeMirror.tableKeywords, function(e, cur) {return e.getTokenAt(cur);}, options);};CodeMirror.registerHelper("hint", "sql", sqlHint);    /**     * 得到匹配的关键字数组     * @param {Object} token     * @param {Object} keywords     * @param {Object} tableKeywords     * @param {Object} options     */function getCompletions(token, keywords, tableKeywords, options) {var found = [],start, pointCount, content = getWord(token.str.string, token.str.end); // found为匹配的数组  if (content && content.length) {start = token.string.charAt(0); //字符串首字母content = content.trim().substring(0, content.lenght); //除首字母外的截取pointCount = (start == '\.') ? true : false; //判断最后一个字符是否是.}var result = null;if (start && start.trim() != '') { // 必须以$开头，这里暂时不解析${}  var regexp = new RegExp("\\b" + content + "\\w+\\.?\\b", "gi");if (pointCount && tableKeywords) {result = tableKeywords.match(regexp);} else {result = keywords.match(regexp);}console.log('result = ' + result);}if (result && result.length) {for (var i = 0; i < result.length; i++) {if (!arrayContains(found, result[i]) && content.length <= result[i].length && pointCount) {if (result[i].charAt(result[i].length-1) == '.') { //如果最后一位是'.'found.push(result[i].substring(content.lastIndexOf("\.") + 1, result[i].length - 1));} else {found.push(result[i].substring(content.lastIndexOf("\.") + 1, result[i].length));}} else {found.push(result[i]);}}}return found;};/** * 获取当前字符串 * @param {Object} str 当前行字符串 * @param {Object} end 结束位置 */function getWord(str, end) {return str.substring(str.lastIndexOf(' '), end);};    /**     * 将wordlist拼成字符串     * @param {Object} wordlist     */function wordToString(wordlist) {var str = '';for (var word in wordlist) {str += word + ' ';}return str;};});

注释还好啦，你比对下原来的js就会发现实现方法。其实我就是定义了外部变量然后通过赋值拓展的方式实现的。

html页面：

<!DOCTYPE html><html><head><meta charset="utf-8" /><title></title></head><script type="text/javascript" src="js/jquery-1.7.1.js"></script><link rel="stylesheet" href="js/codemirror-5.2/theme/3024-day.css"><link type="text/css" rel="stylesheet" href="js/codemirror-5.2/lib/codemirror.css" /><link type="text/css" rel="stylesheet" href="js/codemirror-5.2/addon/hint/show-hint.css" /><script type="text/javascript" src="js/codemirror-5.2/lib/codemirror.js"></script><script type="text/javascript" src="js/codemirror-5.2/mode/sql/sql.js"></script><script type="text/javascript" src="js/codemirror-5.2/addon/hint/show-hint.js"></script><script type="text/javascript" src="js/sql-hint.js"></script><style>.CodeMirror {border: 1px solid black;}</style><body><h2>SQL编辑器</h2><form><textarea id="code" name="code"></textarea></form><script>CodeMirror.keywords = "server software ";CodeMirror.tableKeywords = "server.ip server.cache software.conf software.version software.tags.count ";var editor = CodeMirror.fromTextArea(document.getElementById("code"), {lineNumbers: true,extraKeys: {"Ctrl": "autocomplete"}, //输入s然后ctrl就可以弹出选择项  mode: {name: "text/x-mysql"},theme: "3024-day" //主题  });editor.on('change', function() {editor.showHint(); //满足自动触发自动联想功能});</script></body></html>

第三步，我们来看下具体的结果：

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