How to Enable Content Approval For the Document Library in SharePoint 2013 Online Using REST API

Vijai Anand Ramalingam
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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.

You will see how to enable Content Approval for the Document Library. (Navigate to the Document Library. Click on the Library tab in the ribbon interface. Click on Library Settings. Click on Versioning Settings that is available under General Settings.)

Version Settings

In this article you will see the following:

Create an app using the NAPA Tool in SharePoint 2013 Online.
Cross-Domain Requests.
Enable Content Approval for the Document Library using the REST API.

Endpoint URI

https://c986.sharepoint.com/_api/web/lists/getbytitle('listName')

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 a REST request to enable Content Approval for a Document Library.

IF-MATCH header: It is required in POST requests for a MERGE 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 in POST requests for MERGE operations. Description: Used to specify that the request performs a MERGE operation. Example: "X-HTTP-Method":"MERGE".

MERGE Operation

MERGE operations are used to update existing SharePoint objects.

Create an app using 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 the 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 ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">

</asp:Content>

<%-- The markup in the following Content element will be placed in the TitleArea of the page --%>

<asp:Content 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 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 ContentPlaceHolderID="PlaceHolderMain" runat="server">

<div>

<p>

<b>Enable Content Approval</b>

<br />

<button id="enablecontentapprovalbutton">Enable Content Aproval</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

$("#enablecontentapprovalbutton").click(function (event) {

enableContentApproval();

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];

}

// Enable content approval for the document library

function enableContentApproval() {

var listnametext = document.getElementById("listnametext").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/lists/getbytitle('" + listnametext + "')?@target='" + hostweburl + "'",

method: "POST",

body: "{ '__metadata': { 'type': 'SP.List' }, 'EnableModeration': true}",

headers: {

"IF-MATCH": "*",

"X-HTTP-Method": "MERGE",

"content-type": "application/json;odata=verbose"

success: enableContentApprovalSuccessHandler,

error: enableContentApprovalErrorHandler

});

}

// Success Handler

function enableContentApprovalSuccessHandler(data) {

alert("Content Approval is enabled successfully for the document library.")

}

// Error Handler

function enableContentApprovalErrorHandler(data, errorCode, errorMessage) {

alert("Could not enable content approval: " + 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 list name and then click on the Enable Content Approval button.
Content Approval is enabled for the Document Library.

Summary

Thus in this article you saw how to enable Content Approval for a Document Library using the REST API in SharePoint 2013 Online.

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