tinymce.full.js
function execCommand(command, ui, value, args) {
        var func, customCommand, state = 0;

        if (!/^(mceAddUndoLevel|mceEndUndoLevel|mceBeginUndoLevel|mceRepaint)$/.test(command) && (!args || !args.skip_focus)) {
          editor.focus();
        }

        args = editor.fire('BeforeExecCommand', { command: command, ui: ui, value: value });
        if (args.isDefaultPrevented()) {
          return false;
        }

        customCommand = command.toLowerCase();
        if ((func = commands.exec[customCommand])) {
          func(customCommand, ui, value);
          editor.fire('ExecCommand', { command: command, ui: ui, value: value });
          return true;
        }

        // Plugin commands
        each(editor.plugins, function (p) {
          if (p.execCommand && p.execCommand(command, ui, value)) {
            editor.fire('ExecCommand', { command: command, ui: ui, value: value });
            state = true;
            return false;
          }
        });

        if (state) {
          return state;
        }

        // Theme commands
        if (editor.theme && editor.theme.execCommand && editor.theme.execCommand(command, ui, value)) {
          editor.fire('ExecCommand', { command: command, ui: ui, value: value });
          return true;
        }

        // Browser commands
        try {
          state = editor.getDoc().execCommand(command, ui, value);
        } catch (ex) {
          // Ignore old IE errors
        }

        if (state) {
          editor.fire('ExecCommand', { command: command, ui: ui, value: value });
          return true;
        }

        return false;
      }
function execCommand(command, ui, value, args) {
        var func, customCommand, state = 0;

        if (!/^(mceAddUndoLevel|mceEndUndoLevel|mceBeginUndoLevel|mceRepaint)$/.test(command) && (!args || !args.skip_focus)) {
          editor.focus();
        }

        args = editor.fire('BeforeExecCommand', { command: command, ui: ui, value: value });
        if (args.isDefaultPrevented()) {
          return false;
        }

        customCommand = command.toLowerCase();
        if ((func = commands.exec[customCommand])) {
          func(customCommand, ui, value);
          editor.fire('ExecCommand', { command: command, ui: ui, value: value });
          return true;
        }

        // Plugin commands
        each(editor.plugins, function (p) {
          if (p.execCommand && p.execCommand(command, ui, value)) {
            editor.fire('ExecCommand', { command: command, ui: ui, value: value });
            state = true;
            return false;
          }
        });

        if (state) {
          return state;
        }

        // Theme commands
        if (editor.theme && editor.theme.execCommand && editor.theme.execCommand(command, ui, value)) {
          editor.fire('ExecCommand', { command: command, ui: ui, value: value });
          return true;
        }

        // Browser commands
        try {
          state = editor.getDoc().execCommand(command, ui, value);
        } catch (ex) {
          // Ignore old IE errors
        }

        if (state) {
          editor.fire('ExecCommand', { command: command, ui: ui, value: value });
          return true;
        }

        return false;
      }
function execCommand ( command , ui , value , args ) { var func , customCommand , state = 0 ; if ( ! / ^(mceAddUndoLevel|mceEndUndoLevel|mceBeginUndoLevel|mceRepaint)$ / . test ( command ) && ( ! args || ! args . skip_focus ) ) { editor . focus ( ) ; } args = editor . fire ( 'BeforeExecCommand' , { command : command , ui : ui , value : value } ) ; if ( args . isDefaultPrevented ( ) ) { return false ; } customCommand = command . toLowerCase ( ) ; if ( ( func = commands . exec [ customCommand ] ) ) { func ( customCommand , ui , value ) ; editor . fire ( 'ExecCommand' , { command : command , ui : ui , value : value } ) ; return true ; } // Plugin commands each ( editor . plugins , function ( p ) { if ( p . execCommand && p . execCommand ( command , ui , value ) ) { editor . fire ( 'ExecCommand' , { command : command , ui : ui , value : value } ) ; state = true ; return false ; } } ) ; if ( state ) { return state ; } // Theme commands if ( editor . theme && editor . theme . execCommand && editor . theme . execCommand ( command , ui , value ) ) { editor . fire ( 'ExecCommand' , { command : command , ui : ui , value : value } ) ; return true ; } // Browser commands try { state = editor . getDoc ( ) . execCommand ( command , ui , value ) ; } catch ( ex ) { // Ignore old IE errors } if ( state ) { editor . fire ( 'ExecCommand' , { command : command , ui : ui , value : value } ) ; return true ; } return false ; }
Executes the specified command.

@method execCommand
@param {String} command Command to execute.
@param {Boolean} ui Optional user interface state.
@param {Object} value Optional value for command.
@param {Object} args Optional extra arguments to the execCommand.
@return {Boolean} true/false if the command was found or not.
Executes the specified command .