ckeditor一键排版功能实现方法分析

<script src="https://cdn.jsdelivr.net/npm/ckeditor-full@4.7.3/ckeditor.js"></script>

CKEDITOR.plugins.addExternal('autoformat', '/static/ckeditor/myplugins/autoformat/', 'plugin.js');
var editor = CKEDITOR.replace(this.$el, {
  customConfig: '/static/ckeditor/config.js',
  extraPlugins: 'autoformat'
});

CKEDITOR.editorConfig = function(config) {
  config.extraPlugins = "autoformart";
};

(function() {
  CKEDITOR.plugins.add("autoformat", {
    init: function(a) {
      a.addCommand(
        "autoformat",
        CKEDITOR.plugins.autoformat.commands.autoformat
      );
      a.ui.addButton("autoformat", {
        label: "一键排版",
        command: "autoformat",
        icon: this.path + "images/autoformat.png"
      });
    }
  });
  CKEDITOR.plugins.autoformat = {
    commands: {
      autoformat: {
        exec: function(editor) {
          formatText(editor);
        }
      }
    }
  };
  //格式化
  function formatText(editor) {
    var myeditor = editor;
    if (myeditor.mode == "wysiwyg") {
      var tempimg = new Array();
      var temptable = new Array();
      var tempobject = new Array();
      var isPart = false; //暂时无法实现局部格式化
      if (!isPart) {
        var tmpDiv = document.createElement("DIV");
        var editorhtml = myeditor.getData();
        editorhtml = editorhtml.replace(
          /<div style="page-break-after: always;?">\s*<span style="display: none;?">&nbsp;<\/span>\s*<\/div>/gi,
          "<p>[ page]</p>"
        ); //将div span标签替换为p 标签
        tmpDiv.innerHTML = editorhtml
          .replace(/&nbsp;/gi, "")
          .replace(/<div/gi, "<p")
          .replace(/<\/div/gi, "</p"); //移除空格标签，div替换为p标签。
        if (
          window.navigator.userAgent.toLowerCase().indexOf("msie") > 0
        ) {
          tmpDiv.innerHTML = tmpDiv.innerHTML.replace(
            /<\/p>/gi,
            "<br /></p>"
          ); //每个段落相隔一行
        }
        var tables = tmpDiv.getElementsByTagName("TABLE");
        if (tables != null && tables.length > 0) {
          for (var j = 0; j < tables.length; j++) {
            temptable[temptable.length] = tables[j].outerHTML;
          }
          var formattableCount = 0;
          for (var j = 0; j < tables.length; ) {
            tables[j].outerHTML =
              "#FormatTableID_" + formattableCount + "#";
            formattableCount++;
          }
        }
        var objects = tmpDiv.getElementsByTagName("OBJECT");
        if (objects != null && objects.length > 0) {
          for (var j = 0; j < objects.length; j++) {
            tempobject[tempobject.length] = objects[j].outerHTML;
          }
          var formatobjectCount = 0;
          for (var j = 0; j < objects.length; ) {
            objects[j].outerHTML =
              "#FormatObjectID_" + formatobjectCount + "#";
            formatobjectCount++;
          }
        }
        var imgs = tmpDiv.getElementsByTagName("IMG");
        if (imgs != null && imgs.length > 0) {
          for (var j = 0; j < imgs.length; j++) {
            var t = document.createElement("IMG");
            t.alt = imgs[j].alt;
            t.src = imgs[j].src;
            t.width = imgs[j].width;
            t.height = imgs[j].height;
            t.align = imgs[j].align;
            tempimg[tempimg.length] = t;
          }
          var formatImgCount = 0;
          for (var j = 0; j < imgs.length; ) {
            imgs[j].outerHTML =
              "#FormatImgID_" + formatImgCount + "#";
            formatImgCount++;
          }
        }
        var strongarray = new Array();
        var strongcount = 0;
        for (
          var i = 0;
          i < tmpDiv.getElementsByTagName("b").length;
          i++
        ) {
          strongarray[strongcount] = tmpDiv
            .getElementsByTagName("b")
            [i].innerText.trim();
          tmpDiv.getElementsByTagName("b")[i].innerHTML =
            "#FormatStrongID_" + strongcount + "#";
          strongcount++;
        }
        for (
          var i = 0;
          i < tmpDiv.getElementsByTagName("strong").length;
          i++
        ) {
          strongarray[strongcount] = tmpDiv
            .getElementsByTagName("strong")
            [i].innerText.trim();
          tmpDiv.getElementsByTagName("strong")[i].innerHTML =
            "#FormatStrongID_" + strongcount + "#";
          strongcount++;
        }
        var html = processFormatText(tmpDiv.innerText);
        html = html.replace(
          /<p>\[ page\]<\/p>/gi,
          '<div style="page-break-after: always;"><span style="display: none;">&nbsp;</span></div>'
        ); //p标签替换回原来的div和span标签。
        if (temptable != null && temptable.length > 0) {
          for (var j = 0; j < temptable.length; j++) {
            var tablehtml = temptable[j];
            html = html.replace(
              "#FormatTableID_" + j + "#",
              tablehtml
            );
          }
        }
        if (tempobject != null && tempobject.length > 0) {
          for (var j = 0; j < tempobject.length; j++) {
            var objecthtml =
              '<p align="center">' + tempobject[j] + "</p>";
            html = html.replace(
              "#FormatObjectID_" + j + "#",
              objecthtml
            );
          }
        }
        if (tempimg != null && tempimg.length > 0) {
          for (var j = 0; j < tempimg.length; j++) {
            var imgheight = "";
            var imgwidth = "";
            if (tempimg[j].height != 0)
              imgheight = ' height="' + tempimg[j].height + '"';
            if (tempimg[j].width != 0)
              imgwidth = ' width="' + tempimg[j].width + '"';
            var imgalign = "";
            if (tempimg[j].align != "")
              imgalign = ' align="' + tempimg[j].align + '"';
            var imghtml =
              '<p align="center"><img src="' +
              tempimg[j].src +
              '" alt="' +
              tempimg[j].alt +
              '"' +
              imgwidth +
              " " +
              imgheight +
              ' align="' +
              tempimg[j].align +
              '" border="0"></p>';
            html = html.replace("#FormatImgID_" + j + "#", imghtml);
          }
        }
        for (var i = 0; i < strongcount; i++) {
          html = html.replace(
            "#FormatStrongID_" + i + "#",
            "<p><strong>" + strongarray[i] + "</strong></p>"
          );
        }
        while (html.indexOf("</p></p>") != -1)
          html = html.replace("</p></p>", "</p>");
        while (html.indexOf('<p><p align="center">') != -1)
          html = html.replace(
            '<p><p align="center">',
            '<p align="center">'
          );
        editor.setData(html);
      } else {
      }
    } else {
      alert("必须在设计模式下操作！");
    }
  }
  function processFormatText(textContext) {
    var text = dbc2Sbc(textContext);
    var prefix = "";
    var tmps = text.split("\n");
    var html = "";
    for (var i = 0; i < tmps.length; i++) {
      var tmp = tmps[i].trim();
      if (tmp.length > 0) {
        var reg = /#Format[A-Za-z]+_\d+#/gi;
        var f = reg.exec(tmp);
        if (f != null) {
          tmp = tmp.replace(/#Format[A-Za-z]+_\d+#/gi, "");
          html += f;
          if (tmp != "")
            html += '<p align="center">' + tmp + "</p>\n";
        } else {
          html += "<p style='text-indent:2em;'>" + tmp + "</p>\n";
        }
      }
    }
    return html;
  }
  function dbc2Sbc(str) {
    var result = "";
    for (var i = 0; i < str.length; i++) {
      var code = str.charCodeAt(i);
      // “65281”是“！”，“65373”是“｝”，“65292”是“，”。不转换"，"
      if (
        code >= 65281 &&
        code < 65373 &&
        code != 65292 &&
        code != 65306
      ) {
        // “65248”是转换码距
        result += String.fromCharCode(str.charCodeAt(i) - 65248);
      } else {
        result += str.charAt(i);
      }
    }
    return result;
  }
  String.prototype.trim = function() {
    return this.replace(/(^[\s　]*)|([\s　]*$)/g, "");
  };
  String.prototype.leftTrim = function() {
    return this.replace(/(^\s*)/g, "");
  };
  String.prototype.rightTrim = function() {
    return this.replace(/(\s*$)/g, "");
  };
})();