Delete a Folder From the Document Library in SharePoint 2013 Online Using REST API

Introduction

SharePoint 2013 introduces a Representational State Transfer (REST) service that is comparable to the existing SharePoint client object models. This allows the developers to interact remotely with SharePoint data by using any technology that supports REST web requests. This means that developers can perform Create, Read, Update and Delete (CRUD) operations from their apps for SharePoint, solutions, and client applications, using REST web technologies and standard Open Data Protocol (OData) syntax. In this article you will see the following:

Create an app using the NAPA Tool in SharePoint 2013 Online.
Cross-Domain Requests.
Delete a folder from the Document Library using the REST API.

Endpoint URI

https://c986.sharepoint.com/_api/web/GetFolderByServerRelativeUrl('folderurl')

Note: If you are making cross-domain requests then you need to add SP.AppContextSite(@target) and ?@target='<host web url>' to the endpoint URI.

Properties

The following properties must be used in REST request for deleting the folder:

IF-MATCH header: It is required for POST requests for a DELETE operation. Description: Provides a way to verify that the object being changed has not been changed since it was last retrieved. Or, lets you specify to overwrite any changes, as shown in the following example: "IF-MATCH":"*".
X-HTTP-Method header: It is required when a POST requests a DELETE operation. Description: Used to specify that the request performs a delete operation. Example: "X-HTTP-Method":"DELETE".

Use the following procedure to create an app using the NAPA Tool:

Navigate to the SharePoint 2013 Online site.
Click on Site Contents in the quick launch bar.
Click on “Napa” Office 365 Development Tools.
Click on Add New Project.
Select App for SharePoint, enter the Project name and then click on Create.

Permissions

Ensure appropriate permission is provided to access the content. Click on Properties button, and then click on Permissions. Set the required permission to access the content.

Default.aspx

Replace the contents of Default.aspx with the following:

<%-- The markup and script in the following Content element will be placed in the <head>of the page --%>
<asp:Content ID="Content1" ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">
    <script type="text/javascript" src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.9.1.min.js"></script>
    <script type="text/javascript" src="/_layouts/15/sp.runtime.js"></script>
    <script type="text/javascript" src="/_layouts/15/sp.js"></script>
    <!-- Add your CSS styles to the following file -->
    <link rel="Stylesheet" type="text/css" href="../Content/App.css" />
    <!-- Add your JavaScript to the following file -->
    <script type="text/javascript" src="../Scripts/App.js"></script>
</asp:Content>
<%-- The markup in the following Content element will be placed in the TitleArea of the page --%>
<asp:Content ID="Content2" ContentPlaceHolderID="PlaceHolderPageTitleInTitleArea" runat="server">Page Title</asp:Content>
<%-- The markup and script in the following Content element will be placed in the <body>of the page --%>
<asp:Content ID="Content3" ContentPlaceHolderID="PlaceHolderPageTitleInTitleArea" runat="server">REST API Examples</asp:Content>
<%-- The markup and script in the following Content element will be placed in the <body>of the page --%>
<asp:Content ID="Content4" ContentPlaceHolderID="PlaceHolderMain" runat="server">
    <div>
        <p>
            <b>Delete Folder</b>
            <br />
            <input type="text" value="Folder Server relative URL" id="deletefolderURL" />
            <button id="deletefolderbutton">Delete Folder</button>
        </p>
    </div>
</asp:Content>

App.js

Replace the contents of App.js with the following:

'use strict';
var hostweburl;
var appweburl;
// Load the required SharePoint libraries.
$(document).ready(function () {
    //Get the URI decoded URLs.
    hostweburl = decodeURIComponent(
    getQueryStringParameter("SPHostUrl"));
    appweburl = decodeURIComponent(
    getQueryStringParameter("SPAppWebUrl"));
    //Assign events to buttons
    $("#deletefolderbutton").click(function (event) {
        deleteFolder();
        event.preventDefault();
    });
    // Resources are in URLs in the form:
    // web_url/_layouts/15/resource
    var scriptbase = hostweburl + "/_layouts/15/";
    // Load the js file and continue to load the page.
    // SP.RequestExecutor.js to make cross-domain requests
    $.getScript(scriptbase + "SP.RequestExecutor.js");
});
// Utilities
// Retrieve a query string value.
// For production purposes you may want to use a library to handle the query string.
function getQueryStringParameter(paramToRetrieve) {
    var params = document.URL.split("?")[1].split("&");
    for (var i = 0; i < params.length; i = i + 1) {
        var singleParam = params[i].split("=");
        if (singleParam[0] == paramToRetrieve) return singleParam[1];
    }
}
// Delete folder from the list
function deleteFolder() {
    var deletefolderURL = document.getElementById("deletefolderURL").value;
    var executor;
    // Initialize the RequestExecutor with the app web URL. 
    executor = new SP.RequestExecutor(appweburl);
    executor.executeAsync({
        url: appweburl + "/_api/SP.AppContextSite(@target)/web/GetFolderByServerRelativeUrl('" + deletefolderURL + "')?@target='" + hostweburl + "'",
        method: "POST",
        headers: {
            "IF-MATCH": "*",
            "X-HTTP-Method": "DELETE"
        },
        success: deleteFolderSuccessHandler,
        error: deleteFolderErrorHandler
    });
}
// Success Handler
function deleteFolderSuccessHandler(data) {
    alert("Folder deleted successfully")
}
// Error Handler
function deleteFolderErrorHandler(data, errorCode, errorMessage) {
    alert("Could not delete the folder: " + errorMessage);
}

Deploy the App

Click on Run Project.
The app will be packaged, deployed and launched.
Click on “Click here to launch your app in a new window”.
Click on Trust it.
Enter the folder URL (Example: /Shared Documents/FolderA/FolderA1) and then click on Delete Folder button.
FolderA1 is deleted successfully from the Shared Documents library.

Summary

Thus in this article you saw how to delete a folder from the Document Library in the host site using the REST API in SharePoint 2013 Online.