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XHTML validation in Angular RichTextEditor component

The editor provides an option to validate the source content of the Rich Text Editor against the XHTML standard using the ‘enableXhtml’ property. When you enter or modify content in the editor, it continuously checks the XHTML source content and removes elements and attributes that are not valid.

The editor checks the following settings on validation:

Attributes

  • Must be specified in lowercase.
  • Proper use of quotation marks around the attributes.
  • Must be valid attributes for corresponding HTML element.
  • All the required attributes must be included in the HTML element.

HTML Elements

  • Must be in lowercase.
  • All opening tags must be closed.
  • Allows only the valid HTML elements.
  • Elements must be properly nested.
  • All elements must have one root element.
  • Should not use inline elements inside the block elements.
Source
Preview
app.component.ts
app.module.ts
main.ts
index.html
import { Component } from '@angular/core';
import { ToolbarService, LinkService, ImageService, HtmlEditorService } from '@syncfusion/ej2-angular-richtexteditor';

@Component({
    selector: 'app-root',
    template: `<ejs-richtexteditor id='defaultRTE' [enableXhtml] = 'xhtml'></ejs-richtexteditor>`,
    providers: [ToolbarService, LinkService, ImageService, HtmlEditorService]
})
export class AppComponent  {
    public xhtml = true;
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RichTextEditorAllModule } from '@syncfusion/ej2-angular-richtexteditor';
import { AppComponent } from './app.component';
import { DialogModule } from '@syncfusion/ej2-angular-popups';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        RichTextEditorAllModule,
        DialogModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion Angular Rich Text Editor</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-richtexteditor/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/2.4.1/core.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/zone.js/0.9.0/zone.min.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/0.3.19/marked.js" type="text/javascript"></script>
    <script src="https://jsplayground.syncfusion.com/16.1.0.24/scripts/web/codemirror/codemirror.js" type="text/javascript"></script>
    <script src="https://jsplayground.syncfusion.com/16.1.0.24/scripts/web/codemirror/javascript.js" type="text/javascript"></script>
    <script src="https://jsplayground.syncfusion.com/16.1.0.24/scripts/web/codemirror/css.js" type="text/javascript"></script>
    <script src="https://jsplayground.syncfusion.com/16.1.0.24/scripts/web/codemirror/xml.js" type="text/javascript"></script>
    <script src="https://jsplayground.syncfusion.com/16.1.0.24/scripts/web/codemirror/htmlmixed.js" type="text/javascript"></script>
    <link href="https://jsplayground.syncfusion.com/16.1.0.24/scripts/web/codemirror/codemirror.min.css" rel="stylesheet" />
    <script src="systemjs.config.js"></script>
    <style>
    #loader {
        color: #008cff;
        font-family:  'Helvetica Neue','calibiri';
        font-size: 16px;
        height: 40px;
        left: 45%;
        position: absolute;
        top: 45%;
        width: 30%;
    }
     .e-code-mirror::before {
        content: '\e345';
    }
    .CodeMirror-linenumber,
    .CodeMirror-gutters {
        display: none;
    }

    #special_char,
    .char_block {
        display: inline-block;
    }
    .char_block.e-active {
        /* box-shadow: inset 3px 3px 7px 0px; */
        outline: 1.5px solid;
    }

    .char_block {
        width: 30px;
        height: 30px;
        line-height: 30px;
        margin: 0 5px 5px 0;
        text-align: center;
        vertical-align: middle;
        border: 1px solid #DDDDDD;
        font-size: 20px;
        cursor: pointer;
        user-select: none;
    }

    #custom_tbar,
    #custom_tbar div{
        cursor: pointer;
    }


    #rteSection {
        height: 500px;
    }
  .e-rte-quick-popup .e-rte-quick-toolbar .e-roatate-left::before {
        content: "\e76e";
    }

    .e-rte-quick-popup .e-rte-quick-toolbar .e-roatate-right::before {
        content: "\e726";
    }

    .e-richtexteditor textarea.e-content {
      float: left;
    }
    .e-richtexteditor .e-rte-content {
      overflow: hidden;
    }
    .e-rte-content .e-content.e-pre-source{
      width: 100%;
    }

    .property-panel-content td{
        width: 50%;
    }
    .property-panel-content td div {
        padding-left: 10px;
        padding-top: 10px;
    }

    .e-icon-btn.e-active .e-md-preview::before {
        content: '\e350';
    }

	.e-icon-btn .e-md-preview.e-icons::before {
		content: '\e345';
	}
    .e-icon-btn.e-active .e-md-preview::before,
    #mdCustom .e-icon-btn.e-active .e-md-preview.e-icons::before {
		content: '\e350';
	}
	#mdCustom .e-icon-btn .e-md-preview.e-icons::before {
		content: '\e345';
    }

    #rteDialog.e-dialog .e-dlg-content {
        padding: 0px 0px 5px 16px;
    }
    #custom_tbar .e-tbar-btn-text {
        font-size: 16px;
    }
    .e-bigger #custom_tbar .e-tbar-btn-text {
        font-size: 18px;
    }

    @media (min-width: 320px) and (max-width: 480px) {
        .fabric.e-bigger #rteDialog {
            min-width: 281px;
        }

        .fabric #rteDialog {
            min-width: 241px;
        }

        .bootstrap.e-bigger #rteDialog,
        .bootstrap #rteDialog {
            min-width: 223px;
        }

        .highcontrast.e-bigger #rteDialog {
            min-width: 283px;
        }
        .highcontrast #rteDialog {
            min-width: 243px;
        }
        .material #rteDialog {
            min-width: 224px;
        }
        .material.e-bigger #rteDialog {
            min-width: 236px;
        }
    }

</style>
</head>

<body>
    <app-root>
        <div id='loader'>Loading....</div>
    </app-root>
</body>

</html>