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    Interface XMLHttpRequest

    XMLHttpRequest (XHR) objects are used to interact with servers.

    MDN Reference

    interface XMLHttpRequest {
        DONE: 4;
        HEADERS_RECEIVED: 2;
        LOADING: 3;
        onabort: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
        onerror: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
        onload: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
        onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
        onloadstart: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
        onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
        onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
        ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
        OPENED: 1;
        readyState: number;
        response: any;
        responseText: string;
        responseType: XMLHttpRequestResponseType;
        responseURL: string;
        responseXML: Document | null;
        status: number;
        statusText: string;
        timeout: number;
        UNSENT: 0;
        upload: XMLHttpRequestUpload;
        withCredentials: boolean;
        abort(): void;
        addEventListener<K extends keyof XMLHttpRequestEventMap>(
            type: K,
            listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any,
            options?: boolean | AddEventListenerOptions,
        ): void;
        addEventListener(
            type: string,
            listener: EventListenerOrEventListenerObject,
            options?: boolean | AddEventListenerOptions,
        ): void;
        dispatchEvent(event: Event): boolean;
        getAllResponseHeaders(): string;
        getResponseHeader(name: string): string | null;
        open(method: string, url: string | URL): void;
        open(
            method: string,
            url: string | URL,
            async: boolean,
            username?: string | null,
            password?: string | null,
        ): void;
        overrideMimeType(mime: string): void;
        removeEventListener<K extends keyof XMLHttpRequestEventMap>(
            type: K,
            listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any,
            options?: boolean | EventListenerOptions,
        ): void;
        removeEventListener(
            type: string,
            listener: EventListenerOrEventListenerObject,
            options?: boolean | EventListenerOptions,
        ): void;
        send(body?: Document | XMLHttpRequestBodyInit | null): void;
        setRequestHeader(name: string, value: string): void;
    }

    Hierarchy (View Summary)

    Index

    Properties

    DONE HEADERS_RECEIVED LOADING onabort onerror onload onloadend onloadstart onprogress onreadystatechange ontimeout OPENED readyState response responseText responseType responseURL responseXML status statusText timeout UNSENT upload withCredentials

    Methods

    abort addEventListener dispatchEvent getAllResponseHeaders getResponseHeader open overrideMimeType removeEventListener send setRequestHeader

    Properties

    DONE: 4
    HEADERS_RECEIVED: 2
    LOADING: 3
    onabort: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null
    onerror: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null
    onload: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null
    onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null
    onloadstart: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null
    onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null
    onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null

    MDN Reference

    ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null
    OPENED: 1
    readyState: number

    The XMLHttpRequest.readyState property returns the state an XMLHttpRequest client is in.

    MDN Reference

    response: any

    The XMLHttpRequest response property returns the response's body content as an ArrayBuffer, a Blob, a Document, a JavaScript Object, or a string, depending on the value of the request's XMLHttpRequest.responseType property.

    MDN Reference

    responseText: string

    The read-only XMLHttpRequest property responseText returns the text received from a server following a request being sent.

    MDN Reference

    responseType: XMLHttpRequestResponseType

    The XMLHttpRequest property responseType is an enumerated string value specifying the type of data contained in the response.

    MDN Reference

    responseURL: string

    The read-only XMLHttpRequest.responseURL property returns the serialized URL of the response or the empty string if the URL is null.

    MDN Reference

    responseXML: Document | null

    The XMLHttpRequest.responseXML read-only property returns a Document containing the HTML or XML retrieved by the request; or null if the request was unsuccessful, has not yet been sent, or if the data can't be parsed as XML or HTML.

    MDN Reference

    status: number

    The read-only XMLHttpRequest.status property returns the numerical HTTP status code of the XMLHttpRequest's response.

    MDN Reference

    statusText: string

    The read-only XMLHttpRequest.statusText property returns a string containing the response's status message as returned by the HTTP server.

    MDN Reference

    timeout: number

    The XMLHttpRequest.timeout property is an unsigned long representing the number of milliseconds a request can take before automatically being terminated.

    MDN Reference

    UNSENT: 0
    upload: XMLHttpRequestUpload

    The XMLHttpRequest upload property returns an XMLHttpRequestUpload object that can be observed to monitor an upload's progress.

    MDN Reference

    withCredentials: boolean

    The XMLHttpRequest.withCredentials property is a boolean value that indicates whether or not cross-site Access-Control requests should be made using credentials such as cookies, authentication headers or TLS client certificates.

    MDN Reference

    Methods

    • The XMLHttpRequest.abort() method aborts the request if it has already been sent.

      MDN Reference

      Returns void

    • The dispatchEvent() method of the EventTarget sends an Event to the object, (synchronously) invoking the affected event listeners in the appropriate order.

      MDN Reference

      Parameters

      Returns boolean

    • The XMLHttpRequest method getAllResponseHeaders() returns all the response headers, separated by CRLF, as a string, or returns null if no response has been received.

      MDN Reference

      Returns string

    • The XMLHttpRequest method getResponseHeader() returns the string containing the text of a particular header's value.

      MDN Reference

      Parameters

      • name: string

      Returns string | null

    • The XMLHttpRequest method open() initializes a newly-created request, or re-initializes an existing one.

      MDN Reference

      Parameters

      • method: string
      • url: string | URL

      Returns void

    • Parameters

      • method: string
      • url: string | URL
      • async: boolean
      • Optionalusername: string | null
      • Optionalpassword: string | null

      Returns void

    • The XMLHttpRequest method overrideMimeType() specifies a MIME type other than the one provided by the server to be used instead when interpreting the data being transferred in a request.

      MDN Reference

      Parameters

      • mime: string

      Returns void

    • The XMLHttpRequest method setRequestHeader() sets the value of an HTTP request header.

      MDN Reference

      Parameters

      • name: string
      • value: string

      Returns void

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