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Customize the dialog appearance

You can customize the dialog appearance by providing dialog template as string or HTML element to the content property. In the following sample, dialog is customized as error window appearance.

Source
Preview
index.js
index.html
styles.css
ej.base.enableRipple(true);

var dlgObj = new ej.popups.Dialog({
    header: 'File and Folder Rename',
    content: document.getElementById("dlgContent"),
    showCloseIcon: true,
    visible: false,
    buttons: [{
        buttonModel: { isPrimary: true, content: 'close' }, click:  function() { this.hide() }
    }],
    target: document.querySelector('body'),
    width: '400px',
    animationSettings: { effect: 'Zoom' },
    beforeOpen: onBeforeopen
});
dlgObj.appendTo('#dialog');

var button = new ej.buttons.Button({});
button.appendTo('#dialogButton');

document.getElementById('openBtn').onclick = function () {
    dlgObj.show();
};

function onBeforeopen() {
    document.getElementById('dlgContent').style.visibility = 'visible';
}
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 Dialog customization</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="TypeScript UI Components">
    <meta name="author" content="Syncfusion">
    <link href="styles.css" rel="stylesheet">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/bootstrap.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/bootstrap.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/bootstrap.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="target">
            <center><button id="openBtn" class="e-control e-btn">Open</button></center>
            <div id="dialog"></div>
            <div id="dlgContent" style="visibility: hidden" class="dialog-content">
                <div class="msg-wrapper  col-lg-12">
                    <span class="e-icons close-icon col-lg-2"></span>
                    <span class="error-msg col-lg-10">
                        Can not rename &apos;pictures&apos; because a file or folder with that name already exists 
                    </span>
                </div>
                <div class="error-detail col-lg-8">
                    <span>Specify a different name</span>
                </div>
            </div>
        </div>
    </div>

<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
html,
body,    
#container {
    height: 100%;
    overflow: hidden;
    width: 100%;
}

#loader {
    color: #008cff;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.row {
    padding: 10px 3px;
}

.close-icon {
    width: 24px;
    height: 24px;
    position: relative;
    display: inline-block;
}
.error-msg {
   color: #66afe9;
    display: inline-block;
    position: relative;
    top: -29px;
    left: 32px;
}
.error-detail {
    position: relative;
    left: 45px;
    margin: 0 0 21px;
}
/* csslint ignore:start */
.e-icons.close-icon.col-lg-2:before {
    content: '\e7e9';
    font-size: 26px;
    color:#d9534f;
    position: relative;
    left: -12px;
}

.e-dialog .e-footer-content {
    background-color: #f8f8f8;
}

.e-dialog.e-control.e-popup, .e-dialog.e-control.e-popup .e-dlg-header-content {
    background-color: #d9edf7;
}
.e-dialog.e-control.e-popup {
    padding:3px;
}
.e-dialog.e-control .e-dlg-header-content {
    padding: 10px;
}
.e-dialog.e-control .e-footer-content {
    padding: 8px 12px;
}

.e-dialog.e-control .e-dlg-content {
  padding: 15px 0 0;
}

.msg-wrapper.col-lg-12 {
    margin-top: 20px;
}
/* csslint ignore:end */