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Validation in JavaScript RichTextEditor control

Validation rules

The Rich Text Editor provides the functionality of character count and its validation. So, you can validate the Rich Text Editor’s value on form submission by applying validationRules and validationMessage to the Rich Text Editor.

Rules Description
required Requires value for the Rich Text Editor control.
minlength Requires the value to be of given minimum characters count.
maxlength Requires the value to be of given maximum characters count.

This sample is used to validate form using the obtrusive Validation. Type the values in Rich Text Editor and the form enables the validation with the formvalidator rules by clicking on the submit externally. All rules are validated by the formvalidator rules.

Source
Preview
index.ts
index.html
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);
/**
 * Rich Text Editor default sample
 */
import { RichTextEditor, Toolbar, Link, Image, HtmlEditor, Count, QuickToolbar } from '@syncfusion/ej2-richtexteditor';
import { FormValidator } from '@syncfusion/ej2-inputs';
RichTextEditor.Inject(Toolbar, Link, Image, HtmlEditor, Count, QuickToolbar);
import { Button } from '@syncfusion/ej2-buttons';

let button: Button;
let defaultRTE: RichTextEditor = new RichTextEditor({ showCharCount: true, maxLength: 100, placeholder: 'Type something',
change : function() {
  button.disabled = false;
}
});
defaultRTE.appendTo('#defaultRTE');
  let dialog: Dialog;
 button = new Button({
disabled :true
     });
button.appendTo('#validateSubmit');

new FormValidator('#form-element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 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="index.css" rel="stylesheet" />
   <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-richtexteditor/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-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/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" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id="content" class="box-form" style="margin: 0 auto; width:750px; padding:25px">
            <form id="form-element" class="form-vertical">
                <div class="form-group">
                    <textarea id="defaultRTE" name="defaultRTE" required maxlength="100" minlength="20" data-msg-containerid="dateError">                    </textarea>
                    <div id="dateError" style="padding-top: 10px"></div>
                </div>
                <div style="text-align: center">
                    <button id="validateSubmit">Submit</button>
                    <button id="resetbtn" class="samplebtn e-control e-btn" type="reset" data-ripple="true">Reset</button>
                </div>
            </form>
        </div>
    </div>
</body>

</html>

Validation message

The default error message for a rule can be customizable by defining it along with the concern rule object as follows.

In the following sample, customize the error message along with the concern rule.

Source
Preview
index.ts
index.html
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);

import { RichTextEditor, Toolbar, Link, Image, HtmlEditor, Count, QuickToolbar } from '@syncfusion/ej2-richtexteditor';
import { FormValidator, FormValidatorModel } from '@syncfusion/ej2-inputs';
RichTextEditor.Inject(Toolbar, Link, Image, HtmlEditor, Count, QuickToolbar);
import { Button } from '@syncfusion/ej2-buttons';

let button: Button;
let defaultRTE: RichTextEditor = new RichTextEditor({ showCharCount: true, maxLength: 100, placeholder: 'Type something' ,
change : function() {
   button.disabled = false;
} });
defaultRTE.appendTo('#defaultRTE');

button = new Button({
disabled :true
     });
button.appendTo('#validateSubmit');

let option: FormValidatorModel = {
  rules: {
    // Initialize the CustomPlacement.
    defaultRTE: {
      required: true,
      minLength: [20, 'Need atleast 6 character length'],
      maxLength:[100, 'Maximum 100 character only']
    }
  },
  customPlacement: (inputElement: HTMLElement, dateError: HTMLElement)=>{
    document.getElementById('dateError').appendChild(dateError);
  }
};

let formObject: FormValidator = new FormValidator('#form-element', option);
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 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="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-richtexteditor/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-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/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" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id="content" class="box-form" style="margin: 0 auto; width:750px; padding:25px">
           
            <form id="form-element" class="form-vertical">
                <div class="form-group">
                    <textarea id="defaultRTE" required name="defaultRTE" class="form-control"></textarea>
                    <div id="dateError" style="padding-top: 10px"></div>
                </div>
                <div class="form-group">
                    <div class="col-sm-3 control-label"></div>
                    <div class="col-sm-6">
                        <div id='error'></div>
                    </div>
                </div>
                <div style="text-align: center">
                    <button id="validateSubmit">Submit</button>
                    <button id="resetbtn" class="samplebtn e-control e-btn" type="reset" data-ripple="true">Reset</button>
                </div>
            </form>
            
        </div>
    </div>
</body>

</html>

Custom placement of validation message

The FormValidator has an event customPlacement which can be used to place the error message from default position to desired custom location.

Source
Preview
index.ts
index.html
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);

import { RichTextEditor, Toolbar, Link, Image, HtmlEditor, Count, QuickToolbar } from '@syncfusion/ej2-richtexteditor';
import { FormValidator, FormValidatorModel } from '@syncfusion/ej2-inputs';
RichTextEditor.Inject(Toolbar, Link, Image, HtmlEditor, Count, QuickToolbar);
import { Button } from '@syncfusion/ej2-buttons';

let button: Button;
let defaultRTE: RichTextEditor = new RichTextEditor({ showCharCount: true, maxLength: 100, placeholder: 'Type something' ,
change : function() {
    button.disabled = false;
} });
defaultRTE.appendTo('#defaultRTE');

button = new Button({
disabled :true
     });
button.appendTo('#validateSubmit');

let option: FormValidatorModel = {
  rules: {
  // Initialize the CustomPlacement.
  defaultRTE: { required:  [true, 'RTE: value is required'], minLength: [15, 'RTE: Need atleast 6 character length'], maxLength:[100, 'RTE: Maximum 100 character only']  }
  },
  customPlacement: (inputElement: HTMLElement, error: HTMLElement)=>{
    document.getElementById('error').appendChild(error);
  }
};
let formObject: FormValidator = new FormValidator('#form-element', option);
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 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="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-richtexteditor/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-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/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" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id="content" class="box-form" style="margin: 0 auto; width:750px; padding:25px">
           
            <form id="form-element" class="form-vertical">
                <div class="form-group">
                    <textarea id="defaultRTE" required name="defaultRTE" class="form-control"></textarea>
                    <div id="dateError" style="padding-top: 10px"></div>
                </div>
                <div class="form-group">
                    <div class="col-sm-3 control-label"></div>
                    <div class="col-sm-6">
                        <div id='error'></div>
                    </div>
                </div>
                <div style="text-align: center">
                    <button id="validateSubmit">Submit</button>
                    <button id="resetbtn" class="samplebtn e-control e-btn" type="reset" data-ripple="true">Reset</button>
                </div>
            </form>
            
        </div>
    </div>
</body>

</html>