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Overview

MessageHeader is a Component that showcases the User or Group details in the toolbar. Furthermore, it also presents a typing indicator and a back navigation button for ease of use.
The MessageHeader is comprised of the following components:
ComponentsDescription
ListItem ComponentThis component’s view consists of avatar, status indicator , title, and subtitle. The fields are then mapped with the SDK’s user, group class.
Back ButtonBackButton that allows users to navigate back from the current activity or screen to the previous one

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Usage

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Integration

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader } from "@cometchat/chat-uikit-react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, [])

    return chatUser ? (
      <div>
        {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
        />
        }
      </div>
    ) : null;
  }

​
Actions

Actions dictate how a component functions. They are divided into two types: Predefined and User-defined. You can override either type, allowing you to tailor the behavior of the component to fit your specific needs.
1. OnBack
OnBack is triggered when you click on the back button of the Message Header component. You can override this action using the following code snippet. 
onBack={handleOnBack}
Example In this example, we are employing the onBack action.
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader } from "@cometchat/chat-uikit-react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, []);

    function handleOnBack() {
          console.log("your custom on back action");
    }
    return chatUser ? (
      <div>
        {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          onBack={handleOnBack}
        />
        }
      </div>
    ) : null;
  }
2. OnError
This action doesn’t change the behavior of the component but rather listens for any errors that occur in the Message Header component. 
onError={handleError}
Example In this example, we are employing the onError action.
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader } from "@cometchat/chat-uikit-react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, []);

     function handleError(error: CometChat.CometChatException) {
          throw new Error("your custom error action");
      }
    return chatUser ? (
    <div>
      {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          onError={handleError}
        />
      }
    </div>
    ) : null;
  }

​
Filters

Filters allow you to customize the data displayed in a list within a Component. You can filter the list based on your specific criteria, allowing for a more customized. Filters can be applied using RequestBuilders of Chat SDK. The MessageHeader component does not have any exposed filters.

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Events

Events are emitted by a Component. By using event you can extend existing functionality. Being global events, they can be applied in Multiple Locations and are capable of being Added or Removed. The MessageHeader component does not produce any events.

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Customization

To fit your app’s design requirements, you can customize the appearance of the Message Header component. We provide exposed methods that allow you to modify the experience and behavior according to your specific needs.

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Style

Using Style you can customize the look and feel of the component in your app, These parameters typically control elements such as the color, size, shape, and fonts used within the component.
1. MessageHeader Style
To customize the appearance, you can assign a MessageHeaderStyle object to the MessageHeader component. Example In this example, we are employing the MessageHeaderStyle.
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader, MessageHeaderStyle } from "@cometchat/chat-uikit-react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, [])
    const messageHeaderStyle = new MessageHeaderStyle({
      border: "2px solid #b649d1",
      background: "#ede0ff"
      onlineStatusColor:"#ad09d6"
    });
    const getSubtitleView = (user: any) => {
        return (
          <span style={{ color: "#474347", font: "500 14px Inter, sans-serif" }}>
         {chatUser?.getStatus()}
          </span>
        );
      };
    return chatUser ? (
      <div>
      {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          subtitleView={getSubtitleView(chatUser)}
          messageHeaderStyle={messageHeaderStyle}
        />
      }
      </div>
    ) : null;
  }
The properties exposed by MessageHeaderStyle are as follows:
PropertyDescriptionCode
borderUsed to set borderborder?: string,
borderRadiusUsed to set border radiusborderRadius?: string;
backgroundUsed to set background colourbackground?: string;
heightUsed to set heightheight?: string;
widthUsed to set widthwidth?: string;
backButtonIconTintUsed to set back button icon tintbackButtonIconTint?: string;
typingIndicatorTextFontUsed to set typing indicator textStyletypingIndicatorTextFont?: string;
typingIndicatorTextColorUsed to set typing indicator text colortypingIndicatorTextColor?: string;
subtitleTextFontUsed to set subtitle text font stylesubtitleTextFont?: string;
subtitleTextColorUsed to set subtitle text colorsubtitleTextColor?: string;
onlineStatusColorUsed to set online status colouronlineStatusColor?: string;
privateGroupIconBackgroundUsed to set private groups icon backgoundprivateGroupIconBackground?: string
passwordGroupIconBackgroundUsed to set protected groups icon backgoundpasswordGroupIconBackground?: string
2. Avatar Style
If you want to apply customized styles to the Avatar component within the MessageHeader Component, you can use the following code snippet. For more information you can refer Avatar Styles.
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader, AvatarStyle } from "@cometchat/chat-uikit-react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, [])
    const avatarStyle = new AvatarStyle({
        backgroundColor:"#cdc2ff",
        border:"2px solid #6745ff",
        borderRadius:"10px",
        outerViewBorderColor:"#ca45ff",
        outerViewBorderRadius:"5px",
        nameTextColor:"#4554ff"
    });
    return chatUser ? (
      <div>
      {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          avatarStyle={avatarStyle}
        />
      }
      </div>
    ) : null;
  }
3. ListItem Style
If you want to apply customized styles to the ListItemStyle component within the MessageHeader Component, you can use the following code snippet. For more information, you can refer ListItem Styles.
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader, ListItemStyle } from "@cometchat/chat-uikit-react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, []);
    const listItemStyle = new ListItemStyle({
      background: "transparent",
      padding:"20px",
      border:"1px solid #e9b8f5",
      titleColor:"#8830f2",
      borderRadius:"20px"
    });
    return chatUser ? (
      <div>
      {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          listItemStyle={listItemStyle}
        />
      }
      </div>
    ) : null;
  }
4. StatusIndicator Style
If you want to apply customized styles to the Status Indicator component within the MessageHeader Component, you can use the following code snippet. For more information you can refer StatusIndicator Styles.
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader, ListItemStyle } from "@cometchat/chat-uikit-react";
  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, []);
    const statusIndicatorStyle = {
        background: "#db35de",
        height:"10px",
        width:"10px"
      };
    return chatUser ? (
      <div>
      {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          statusIndicatorStyle={statusIndicatorStyle}
        />
      }
      </div>
    ) : null;
  }

​
Functionality

These are a set of small functional customizations that allow you to fine-tune the overall experience of the component. With these, you can change text, set custom icons, and toggle the visibility of UI elements. Here is a code snippet demonstrating how you can customize the functionality of the Message Header component. 
<CometChatMessageHeader
  user={chatUser}
  hideBackButton={true}
/>
Following is a list of customizations along with their corresponding code snippets:
PropertyDescriptionCode
user reportUsed to pass user object of which header specific details will be shownuser={chatUser}
group reportUsed to pass group object of which header specific details will be showngroup={chatGroup}
passwordGroupIconUsed to set custom protected group iconpasswordGroupIcon="your custom private group icon url"
privateGroupIconUsed to set custom private group iconprivateGroupIcon="your custom protected group icon url"
hideBackButtonUsed to toggle back button visibilityhideBackButton={true}
disableTypingUsed to enable disable typing indicatorsdisableTyping={true}
disableUsersPresenceUsed to toggle functionality to show user’s presencedisableUsersPresence={true}

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Advanced

For advanced-level customization, you can set custom views to the component. This lets you tailor each aspect of the component to fit your exact needs and application aesthetics. You can create and define your views, layouts, and UI elements and then incorporate those into the component.

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ListItemView

The MessageHeader component consists of a listItemView. You can customize the ListItem according to your requirements by using the listItemView property. 
listItemView = { CustomListItemView };
Example
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader, ListItemStyle, AvatarStyle, CometChatListItem } from "@cometchat/chat-uikit-react";
import { createComponent } from "@lit-labs/react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, []);
    const CometChatListItems = createComponent({
      tagName: "cometchat-list-item",
      elementClass: CometChatListItem,
      react: React,
    });
    const avatarStyle = new AvatarStyle({
        backgroundColor:"#cdc2ff",
        border:"2px solid #6745ff",
        borderRadius:"10px",
        outerViewBorderColor:"#ca45ff",
        outerViewBorderRadius:"5px",
        nameTextColor:"#4554ff"
    });
    const listItemStyle = new ListItemStyle({
      background: "transparent",
      padding:"5px",
      border:"1px solid #e9b8f5",
      titleColor:"#8830f2",
      borderRadius:"20px",
      width:"100% !important"
    });
    const CustomListItemView = React.useMemo(() => {
            return (
              <>
                <CometChatListItems
                  style={{width:"100%"}}
                  avatarURL="your custom avatar url"
                  title={chatUser?.getName()}
                  hideSeparator={true}
                  avatarStyle={avatarStyle}
                  listItemStyle={listItemStyle}
                />
              </>
            )
    }, []);
  return chatUser ? (
    <div>
      {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          listItemView={CustomListItemView}
        />
      }
    </div>
    ) : null;
  }

​
SubtitleView

By using the subtitleView property, you can modify the SubtitleView to meet your specific needs. 
subtitleView={CustomSubtitleView()}
Example
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader } from "@cometchat/chat-uikit-react";

  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, []);
   const CustomSubtitleView =() => {
        return(
            <div style={{color:"#db35de", fontSize:"15px"}}>{chatUser?.getStatus()}</div>
        )
    }
    return chatUser ? (
      <div>
        {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          subtitleView={CustomSubtitleView()}
        />
        }
      </div>
    ) : null;
  }

​
BackButtonIconURL

You can customize the Back Icon according to your specific requirements by using the backButtonIconURL property. 
backButtonIconURL = "your custom back button icon url";
Example
MessageHeaderDemo.tsx

import React from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader } from "@cometchat/chat-uikit-react";


  export function MessageHeaderDemo() {
    const [chatUser, setChatUser] = React.useState<CometChat.User>()
    React.useEffect(() => {
        CometChat.getUser("uid").then((user) => {
            setChatUser(user);
        })
    }, []);
    return chatUser ? (
      <div>
        {chatUser &&
        <CometChatMessageHeader
          user={chatUser}
          backButtonIconURL='your custom icon url'
        />
        }
      </div>
    ) : null;
  }
You can customize the Menu options to meet your specific needs by using the menu property. 
menu={getMenu()}
Example
MessageHeaderDemo.jsx

import React, { useState, useEffect } from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import { CometChatMessageHeader } from "@cometchat/chat-uikit-react";

export function MessageHeaderDemo() {
  const [chatUser, setChatUser] = useState(null);

  useEffect(() => {
    CometChat.getUser("uid").then((user) => {
      setChatUser(user);
    });
  }, []);

  const getMenu = () => {
    const handleReload = () => {
      window.location.reload();
    };
    const getButtonStyle = () => {
      return {
        height: "20px",
        width: "20px",
        border: "none",
        borderRadius: "0",
        background: "transparent",
        buttonIconTint: "#7E57C2"
      };
    };
    return (
      <div style={{ marginRight: "20px" }}>
        <cometchat-button
          iconURL="custom icon url"
          buttonStyle={JSON.stringify(getButtonStyle())}
          onClick={handleReload}
        >
          {" "}
        </cometchat-button>
      </div>
    );
  };

  return chatUser ? (
    <div>
      <CometChatMessageHeader
        user={chatUser}
        menu={getMenu()}
      />
    </div>
  ) : null;
}