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HOW TO UPLOAD MULTIPLE FILES TOGETHER INTO A DOCUMENT LIBRARY IN SHAREPOINT

By Chinmaya Tripathi on 9/18/2020

  

Introduction

 

SharePoint provides a ton of features for a user to imply along with a ton of customizations for their convenience. This blog focuses on implementing things programmatically i.e. using the REST API to get the work done.

The goal of this blog is to provide complete steps to be followed for inserting multiple files into a document library using REST API’s in SharePoint. The steps followed follow the best practices while coding any SharePoint application.

Getting started

In this tutorial we will take the example of storing generated Invoices files inside a document library named Invoices, with the help of a file upload form. The entire process will involve 4 major steps.

[STEP 1]

Let's enable the publishing feature of your SharePoint site, which allows you to publish your own customized webpages. To activate your site’s publishing feature,

Go to Settings -> Site settings, go to Site Collection Administration and select Site collection features.

On the Site Collection Features page, scroll down to SharePoint Server Publishing Infrastructure and select Activate.

 

[STEP 2]

Now let's get started with creating a document library and page for input.

1) The very first step we’ll be doing is creating a document library in our SharePoint website.

On the home page, select New -> Document Library -> (Enter the name *Invoices*)


2) Second step is to create a page inside your site contents from where you’ll display the upload form.

From the Settings icon on top right -> Select Site contents -> Pages -> New Page -> Enter name as *Upload*.

 

[STEP 3]

Now our basics steps are completed, time dive into the SP page we’ll be editing, for that ->

Open the file (Upload.aspx) and go to its edit mode -> Insert (from the ribbon) -> Web part.

You’ll see a bunch of categories and their corresponding parts

Select Media and content in Categories section -> Script Editor in part section respectively.

Following this add the selected part onto your page and click on edit script.

 

[STEP 4]

<!DOCTYPE html>
<html>
<head>
    <title>Upload file</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>

    <!-- A Dummy form to display a file input field.
    You can even select multiple files and hit the upload button. -->

    <input id="getFile" type="file" /><br />
    <input id="addFileButton" type="button" value="Upload" onclick="uploadFile()" />

    <!-- The main JS script -->
    <script>

        function uploadFile() {
            //Storing the name of the document library in which you want to upload your files.
            var serverRelativeUrlToFolder = 'Invoices';

            // Getting the files from the form
            var fileInput = $('#getFile');

            //Storing the file name
            var fileName = fileInput.files.name; 

            // Lets count how many files are being uploaded.
            var fileLength = fileInput.files.length;

            //Getting the SharePoint default URL of your website.
            var serverURL = _spPageContextInfo.webAbsoluteUrl;

            var filesUploaded = 0;

            /*Looping through all the files uploaded and storing them inside the 
            document library. */
            for (i = 0; i < fileLength; i++) {

                // Getting the file in a string buffer format to process.
                var getFile = getFileBuffer(i);

                // Working on the array buffer recieved from the above function call.
                getFile.done((arrayBuffer, i) => {

                    // Function to add the file inside the document library.
                    var addFile = addFileToFolder(arrayBuffer, i);

                    /*On successfull completion of the function, display the alert message
                    of uploaded files.*/
                    addFile.done((file, status, xhr) => {
                        filesUploaded++;

                        // Checking if all the files are done uploading to the document library
                        if (fileLength === filesUploaded) {
                            alert("ALL THE FILES ARE UPLOADED SUCCESSFULLY!"); //If yes, ALERT Message!

                            /*Setting the values of form back to null so that we 
                            can recieve other files to upload as well. */
                            $('#getFile').value = null;
                            fileLength = 0;
                        }
                    });
                    // Called if failed to add the file.
                    addFile.fail(onError);
                });
                // Called if failed to get the array buffer of the file.
                getFile.fail(onError);
            }

            // Function to get the file as an array buffer.  
            function getFileBuffer(i) {
                var deferred = jQuery.Deferred();

                // Initializing a new file reader
                var reader = new FileReader();

                // Resolving the promise if satisfied. 
                reader.onloadend = function (e) {
                    deferred.resolve(e.target.result, i);
                }
                // Rejecting the promise if any error.
                reader.onerror = function (e) {
                    deferred.reject(e.target.error);
                }
                /* Function to convery file into array buffer, 
                it returns a promise.*/
                reader.readAsArrayBuffer(fileInput.files[i]);
                return deferred.promise();
            }


            // Funtion to add the file to the Document library on SharePoint.  
            function addFileToFolder(arrayBuffer, i) {

                var index = i; //Getting the current file context
                var fileName = fileInput.files[index].name; //Getting the file name.

                // Constructing the endpoint.  
                var DLEndpoint = String.format(
                    "{0}/_api/web/getfolderbyserverrelativeurl('{1}')/files" +
                    "/add(overwrite=true, url='{2}')",
                    serverURL, serverRelativeUrlToFolder, fileName);

                // Send the request and return the response.  
                return $.ajax({
                    url: DLEndpoint,
                    type: "POST",
                    data: arrayBuffer,
                    processData: false,
                    headers: {
                        "accept""application/json;odata=verbose",
                        "X-RequestDigest": jQuery("#__REQUESTDIGEST").val(),
                        "content-length": arrayBuffer.byteLength
                    }
                });
            }

            // A fcuntion to display error messages.   
            function onError(error) {
                alert(error.responseText);
            }
        }
    </script>
</body>
</html>

 

[EXPLANATION] -

The following code snippet contains all the code required for you to implement your desired functionality.

If you want to understand the code, just through it and you have a detailed commented explanation on each step which will explain you the function of each line used and in what context.

Copy the code above and paste it inside the small textbox opened.

Click on Insert -> Save the page


Click on Publish and you’re good to go!

 

CONCLUSION

Working on some SharePoint modules can be pretty tricky until you connect the dots, it’s actually very easy to work with. In the above example, you can apply them to store the files in nested folder structure inside a document library as well, just provide the relative path to folder you want your files to be saved.

 

Thank you for your time.

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