# all files / src/js/base/module/ Placeholder.js

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     import $ from 'jquery';
    export default class Placeholder {
      constructor(context) {
        this.context = context;

        this.$editingArea = context.layoutInfo.editingArea;
        this.options = context.options;
        this.events = {
          'summernote.init summernote.change': () => {
            this.update();
          },
          'summernote.codeview.toggled': () => {
            this.update();
          }
        };
      }

      shouldInitialize() {
        return !!this.options.placeholder;
      }

      initialize() {
        this.$placeholder = $('<div class="note-placeholder">');
        this.$placeholder.on('click', () => {
          this.context.invoke('focus');
        }).html(this.options.placeholder).prependTo(this.$editingArea);

        this.update();
      }

      destroy() {
        this.$placeholder.remove();
      }

      update() {
        const isShow = !this.context.invoke('codeview.isActivated') && this.context.invoke('editor.isEmpty');
        this.$placeholder.toggle(isShow);
      }
    }