JSOM - update metadata of existing document in a document library

If it works on a custom library it probably works.

Whats the score with that column name Project_0020_Number? Is the column name the same in Shared Documents?

My apologies, I meant it works on custom lists but not on a document library.  "Project_0020_Number" is the name of the column in my document library

Here's the error I get:

Here's the error I get "Request failed. List 'Shared Documents' does not exist at site with URL 'http://isogunro.com/nrm. undefined"

Code looks fine.

Is the list in the web the error message mentions?

Is that url correct for the SPWeb instance?

Do you have a library without spaces in name to test against?

I figured out that I need to modify the following line with the column that I need to update.

        var body = String.format("{{'__metadata':{{'type':'{0}'}},'FileLeafRef':'{1}','Title':'{2}','Project_0020_Number':'{3}'}}",
            itemMetadata.type, newName, newName,projNum);

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I get the following error:
<?xml version="1.0" encoding="utf-8"?><m:error xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"><m:code>-1, Microsoft.SharePoint.Client.InvalidClientQueryException</m:code><m:message xml:lang="en-US">The property 'Project_0020_Number' does not exist on type 'SP.Data.Shared_x0020_DocumentsItem'. Make sure to only use property names that are defined by the type.</m:message></m:error>


Project_0020_Number is the internal name of the column I need to update

I'm sorry, I found another solution that worked but I am unable to update a certain column.  Here's the code

'use strict';

jQuery(document).ready(function () {

    // Check for FileReader API (HTML5) support.
    if (!window.FileReader) {
        alert('This browser does not support the FileReader API.');
    }
    
   });

// Upload the file.
// You can upload files up to 2 GB with the REST API.
function uploadFile() {
//alert("HELLO");
    // Define the folder path for this example.
    var serverRelativeUrlToFolder = 'Shared Documents';

    // Get test values from the file input and text input page controls.
    var fileInput = jQuery('#getFile');
    var newName = jQuery('#displayName').val();
	//alert("fileInput: "+fileInput);
	//alert("newName: "+newName);
    // Get the server URL.
    var serverUrl = _spPageContextInfo.webAbsoluteUrl;

    // Initiate method calls using jQuery promises.
    // Get the local file as an array buffer.
    var getFile = getFileBuffer();
    getFile.done(function (arrayBuffer) {

        // Add the file to the SharePoint folder.
        var addFile = addFileToFolder(arrayBuffer);
        addFile.done(function (file, status, xhr) {
            // Get the list item that corresponds to the uploaded file.
            var getItem = getListItem(file.d.ListItemAllFields.__deferred.uri);
            getItem.done(function (listItem, status, xhr) {
            /***************************************************************************/            
            /* --------------- Update list with some of the form data -----------------*           
				if (status === "success"){
					updateLibrary(listItem.d.Id, "projNum");	
					console.log(listItem.d.Id);
					console.log(status);
					console.log(xhr);
			
				}            
             --------------- Update list with some of the form data -----------------*/
            /***************************************************************************/
                // Change the display name and title of the list item.
                var changeItem = updateListItem(listItem.d.__metadata);
                changeItem.done(function (data, status, xhr) {
                    alert('file uploaded and updated');
                });
                changeItem.fail(onError);
            });
            getItem.fail(onError);
        });
        addFile.fail(onError);
    });
    getFile.fail(onError);

    // Get the local file as an array buffer.
    function getFileBuffer() {
        var deferred = jQuery.Deferred();
        var reader = new FileReader();
        reader.onloadend = function (e) {
            deferred.resolve(e.target.result);
        }
        reader.onerror = function (e) {
            deferred.reject(e.target.error);
        }
        reader.readAsArrayBuffer(fileInput[0].files[0]);
        return deferred.promise();
    }

    // Add the file to the file collection in the Shared Documents folder.
    function addFileToFolder(arrayBuffer) {

        // Get the file name from the file input control on the page.
        var parts = fileInput[0].value.split('\\');
        var fileName = parts[parts.length - 1];

        // Construct the endpoint.
        var fileCollectionEndpoint = String.format(
                "{0}/_api/web/getfolderbyserverrelativeurl('{1}')/files" +
                "/add(overwrite=true, url='{2}')",
                serverUrl, serverRelativeUrlToFolder, fileName);
                console.log("fileCollectionEndpoint "+fileCollectionEndpoint);

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

    // Get the list item that corresponds to the file by calling the file's ListItemAllFields property.
    function getListItem(fileListItemUri) {

        // Send the request and return the response.
        return jQuery.ajax({
            url: fileListItemUri,
            type: "GET",
            headers: { "accept": "application/json;odata=verbose" }
        });
    }

    // Change the display name and title of the list item.
    function updateListItem(itemMetadata) {
console.log(itemMetadata);
alert(itemMetadata.id);
var projNum = "Proj number 132";
        // Define the list item changes. Use the FileLeafRef property to change the display name. 
        // For simplicity, also use the name as the title. 
        // The example gets the list item type from the item's metadata, but you can also get it from the
        // ListItemEntityTypeFullName property of the list.
        var body = String.format("{{'__metadata':{{'type':'{0}'}},'FileLeafRef':'{1}','Title':'{2}','Project_0020_Number':'{3}'}}",
            itemMetadata.type, newName, newName,projNum);
console.log("body: "+body);
        // Send the request and return the promise.
        // This call does not return response content from the server.
        return jQuery.ajax({
            url: itemMetadata.uri,
            type: "POST",
            data: body,
            headers: {
                "X-RequestDigest": jQuery("#__REQUESTDIGEST").val(),
                "content-type": "application/json;odata=verbose",
                "content-length": body.length,
                "IF-MATCH": itemMetadata.etag,
                "X-HTTP-Method": "MERGE"
            }
        });
    }
}

// Display error messages. 
function onError(error) {
    console.log(error.responseText);
}

function updateLibrary(itemID, prjNum){
alert("itemID: "+itemID);
alert("proj num: "+prjNum);
/*		$().SPServices({
			operation: "UpdateListItems",
			//async: false,
			listName: "Shared Documents",
			ID: itemID,
			valuepairs: [["Project_0020_Number",prjNum]],		
		completefunc: function(xData, status){
		console.log(xData);
		console.log("status: "+status);
				//alert("Sending the xml request to the server was: " + status);
				//alert("Sharepoint processing of the message returned: " + xData.responseText);
		}
		});	*/
		
                                //var rowID = parseInt(itID);
                               var ctx = new SP.ClientContext.get_current();
								var customList = ctx.get_web().get_lists().getByTitle('Shared Documents');
								var listItem = customList.getItemById(itemID);
								
								/*Set the value and update*/
								listItem.set_item('Project_0020_Number', prjNum);
								listItem.update();
								
								ctx.executeQueryAsync(function(){
								    /*Need to change this to show on the page*/
								    alert('Updated'); 
								},function(sender, args){
								    alert('Request failed. '+args.get_message() + '\n' + args.get_stackTrace());
								});

}

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I found the solution here (Code Example 2)  This helped me with my original issue which was to upload a file but then I could not update other columns/metadata.  When I tried to, I received the error posted in my last comment.

ARGH!!  I need rest in my life.  Can't believe I missed that.  Thank you!!!

Happens to us all! :)