SharePoint-Hosted Add-In By Using NAPA Tools And Delete SharePoint Task List Item Using JSOM

Introduction

In this article, we will learn how to delete a basic SharePoint-hosted SharePoint Add-in by using Napa Office 365 Development Tools. Sharepoint basic operations are used by JavaScript Object Model here. If there is any change, post your comments here.

Develop the project using the following method in the NAPA Tool.

On your Developer Site, open the "Napa" Office 365 Development Tools and then choose Add New Project.
Choose the App for SharePoint template, name the project Create Site and then choose the Create button.
Replace APP.js with the following source code.
Publish Your App.

Prerequisites

The following are important steps to be done before creating the app.

Specify the permissions that your app needs as in the following.
Choose the Properties button at the bottom of the page.
In the Properties window, choose Permissions.
In the Content category, set the Write permissions for the Tenant scope.
In the Social category, set the Read permissions for the User Profiles scope.
Close the Properties window.

Basic and important things we want to know ,

Creating, updating, and deleting lists through the client object model works similarly to server object model using .Net Framework(CSOM,SSOM). But the operations does not complete unless until you call the executeQueryAsync (succeededCallback, failedCallback) function.

SharePoint 2013 introduces a NAPA tool service that is comparable to the existing SharePoint client object models.

We can use NAPA Tool to perform Create, Read, Update, and Delete (CRUD) operations from their apps for SharePoint.

By following this article, you can learn how to create a simple SharePoint-hosted SharePoint Add-in by using Napa. The add-in that you’ll create includes controls and code for managing lists and list items.

Choose the kind of add-in you want to create, name the project, and then click the Create button.

Napa is a tool that you can use to create SharePoint-hosted SharePoint Add-ins. We can't create a PHA (Provider Hosted APP) using NAPA tool.

Click the Create button.

Default .aspx displays like the above picture and App.js file.

You could add more .js files and add code to it instead of making changes to the existing file.

Chane your code based on your requirement here.

Change the APP.js file with the below code.

Then, click Settings page to give permission to this app.

Then, publish your app.

Choose the "Click here to launch your add-in in a new window" link.

Click "Trust it" option to deploy your app here. Your login popup window will show up and ask your credentials.

Enter your credentials and click OK.

List is deleted successfully.

Here, if you want to delete a list, call the deleteObject() function in your code .

default aspx page code,

<asp:Content ContentPlaceHolderID="PlaceHolderMain" runat="server">
<div id="starter"> <input type="text" value="List name here" id="ListOperations"/><button id="createlistbutton">ListOperations</button> <p> Lists
</div></asp:Content>

Source code

'use strict';
var context = SP.ClientContext.get_current();
var user = context.get_web().get_currentUser();
var web = context.get_web();
var lists = web.get_lists();
var listItemCollection; // This variable is used later when you add list items.
(function () {
// This code runs when the DOM is ready and creates a context object which is
// needed to use the SharePoint object model.
$(document).ready(function () {
$("#createlistbutton").click(function (event) {
DeleteListItem();
event.preventDefault();
});
});
function deleteListItem() {
var oList = web.get_lists().getByTitle('TaskList');
this.ListItem = oList.getItemById(3);
ListItem.set_item('Title', 'NewTask');
ListItem.deleteObject();
clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}
function onQuerySucceeded() {
alert('Item deleted!');
}function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}
})();