Create an App in Office 365 and SharePoint 2013: Part 2

Manpreet Singh
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As we saw from my last article how to create an App in Office 365 and SharePoint 2013 and create an app Part 1, here in this article we will see a different app that you will be able to use in your daily job profiles and it's actually going to help you a lot.

As in my last statement, “When we all see some new apps, the first thing of a techie guy that comes in mind is “Even I want to make an app” but people either get carried away or are not able to determine how to start.”

Create an App in Office 365 and SharePoint 2013: Part 1

So, let's go ahead and determine how to implement our new app.

Open your site in Office 365 or on On-Premise.
Click on the Site Settings and click on Add an app.

Figure 1: Office 365 Setting

Add "Napa" Office 365 Development Tools from the SharePoint Store.

Figure 2: Site Contents

Once you have added the tool, it will be available in your site contents. This app is a tool to start building apps for Office and SharePoint.
Once added, click on it.

Figure 3: Build the App

It will ask you what kind of app you want to build, for us it will be App for SharePoint.
Provide it a name and click on Create.
In this article we will create an app where on a button click you will be able to create a list.
Here we will have a button placed on the site where we will create a list by just clicking on it rather than going to site contents and counting it manually.
Now when your app has been created, you will see in the default.aspx page the code behind.
Paste following code under PlaceHolder Main.

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

Code

<div id="starter">
<input type="text" value="List name" id="createlistbox"/><button id="createlistbutton">Create List</button>
</div>

Here we are creating a button where we will generate an event.

Now we need to write a function for the button to call, so click on App.js.

Here in App.js, copy the following variables on the top:

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;

Here we assign the variables to be used in the functions.

Under the document.ready function, paste in the flowing lines of code to call the function.

$(document).ready(function()
{
$("#createlistbutton").click(function(event)
{
createnewlist();
event.preventDefault();
})
}

Here under the document.ready function we are calling our function on page load.

Then paste the following function where we will write our function of createnewlist:

function createnewlist()
{
// Create a new SharePoint list with the name on the text box.
var listCreateInfo = new SP.ListCreationInformation();
var listname = document.getElementById("createlistbox").value;
listCreateInfo.set_title(listname);
listCreateInfo.set_templateType(SP.ListTemplateType.genericList);
lists = web.get_lists();
var newList = lists.add(listCreateInfo);
context.load(newList);
context.executeQueryAsync(onListCreationSuccess, onListCreationFail);
}
}
function onListCreationFail(sender, args)
{
alert('Failed to create the list. ' + args.get_message());
}

Now if you create a similar list with duplicate names the error in the message will tell you that a list with the same name exists so kindly use a different name.
In that case when you click on the button, the list with a different name will be created or else it will throw an error.
Now after this, let's deploy the code.

Figure 4: Bar

Once you have made all the necessary updates to you code, click on the Play icon button that states “Run Project”.
It will first prepare, then deploy and launch.

Figure 5: Output