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Style and appearance in JavaScript ComboBox control

08 May 2023 / 3 minutes to read

The following content provides the exact CSS structure that can be used to modify the control’s appearance based on the user preference.

Customizing the appearance of wrapper element

Use the following CSS to customize the appearance of wrapper element.

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.e-ddl.e-input-group.e-control-wrapper .e-input {
    font-size: 20px;
    font-family: emoji;
    color: #ab3243;
    background: #32a5ab;
}

Customizing the dropdown icon’s color

Use the following CSS to customize the dropdown icon’s color.

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.e-ddl.e-input-group .e-input-group-icon,.e-ddl.e-input-group.e-control-wrapper .e-input-group-icon:hover {
    color: #bb233d;
    font-size: 13px;
}

Customizing the focus color

Use the following CSS to customize the focusing color of input element.

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.e-ddl.e-input-group.e-control-wrapper.e-input-focus::before, .e-ddl.e-input-group.e-control-wrapper.e-input-focus::after {
    background: #c000ff;
}

Customizing the outline theme’s focus color

Use the following CSS to customize the focusing color of outline theme.

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.e-outline.e-input-group.e-input-focus:hover:not(.e-success):not(.e-warning):not(.e-error):not(.e-disabled):not(.e-float-icon-left),.e-outline.e-input-group.e-input-focus.e-control-wrapper:hover:not(.e-success):not(.e-warning):not(.e-error):not(.e-disabled):not(.e-float-icon-left),.e-outline.e-input-group.e-input-focus:not(.e-success):not(.e-warning):not(.e-error):not(.e-disabled),.e-outline.e-input-group.e-control-wrapper.e-input-focus:not(.e-success):not(.e-warning):not(.e-error):not(.e-disabled) {
    border-color: #b1bd15;
    box-shadow: inset 1px 1px #b1bd15, inset -1px 0 #b1bd15, inset 0 -1px #b1bd15;
}

Customizing the disabled component’s text color

Use the following CSS to customize the text color when the component is disabled.

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.e-input-group.e-control-wrapper .e-input[disabled] {
    -webkit-text-fill-color: #0d9133;
}

Customizing the float label element’s focusing color

Use the following CSS to customize the focusing color of float label element.

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.e-float-input.e-input-group:not(.e-float-icon-left) .e-float-line::before,.e-float-input.e-control-wrapper.e-input-group:not(.e-float-icon-left) .e-float-line::before,.e-float-input.e-input-group:not(.e-float-icon-left) .e-float-line::after,.e-float-input.e-control-wrapper.e-input-group:not(.e-float-icon-left) .e-float-line::after {
    background-color: #2319b8;
}

.e-ddl.e-input-group.e-control-wrapper.e-float-input.e-input-focus .e-float-text.e-label-top, .e-float-input.e-control-wrapper:not(.e-error).e-input-focus input ~ label.e-float-text {
    color: #2319b8;
}

Customizing the color of the placeholder text

Use the following CSS to customize the text color of placeholder.

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.e-ddl.e-input-group input.e-input::placeholder {
    color: red;
}

Customizing the text selection color

Use the following CSS to customize the selection color of text and background.

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.e-ddl.e-input-group input.e-input::selection {
    color: red;
    background: yellow;
}

Customizing the background color of focus, hover, and active item’s

Use the following CSS to customize the background color of focus, hover and active item’s.

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.e-dropdownbase .e-list-item.e-item-focus, .e-dropdownbase .e-list-item.e-active, .e-dropdownbase .e-list-item.e-active.e-hover, .e-dropdownbase .e-list-item.e-hover {
    background-color: #1f9c99;
    color: #2319b8;
}

Customizing the appearance of pop-up element

Use the following CSS to customize the appearance of popup element.

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.e-dropdownbase .e-list-item, .e-dropdownbase .e-list-item.e-item-focus {
    background-color: #29c2b8;
    color: #207cd9;
    font-family: emoji;
    min-height: 29px;
}

Adding mandatory asterisk to placeholder and float label

You can add a mandatory asterisk(*) to placeholder and float label using .e-input-group.e-control-wrapper.e-float-input .e-float-text::after class.

Source
Preview
app.ts
index.html
asterisk.css
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import { ComboBox } from '@syncfusion/ej2-dropdowns';

// defined the array of data
let sportsData: string[] = ['Badminton', 'Cricket', 'Football', 'Golf', 'Tennis'];

// initialize ComboBox component
let comboBoxObject: ComboBox = new ComboBox({
    //set the data to dataSource property
    dataSource: sportsData,
    // set placeholder to ComboBox input element
    placeholder: "Select a game"

    floatLabelType: "auto"
});

// render initialized ComboBox
comboBoxObject.appendTo('#comboelement');
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<!DOCTYPE html>
<html lang="en">

<head>
            
    <title>EJ2 ComboBox</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="asterisk.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-dropdowns/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' style="margin:50px auto 0; width:250px;">
        <br>
        <input type="text" tabindex="1" id='comboelement' />
    </div>
</body>

</html>
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#container {
    visibility: hidden;
}

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

.e-input-group.e-control-wrapper.e-float-input .e-float-text::after {
    content: '*';
    color: red;
}
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