I am trying to write custom code for list item attachments. As it is not allowed to overwrite them, I will check if file already exists. If yes, will delete and then upload again.

I found a method SP.AttachmentCollection.getByFileName Method (sp.js) which can fetch list item by file name. Does anyone has sample code for this?

I am not able to find any documentation on this.

1 Answer 1


You can simply invoke a REST call to following URL


Then check the response to see if file exists or not.


function onSuccess(sender, args) {
    var item = listItem;
    var total = item.get_attachmentFiles().get_count();
    if (total > 0) {
        console.log(total + " file attachments");

        //Attachment exists and no need to re attach

function onFailure(sender, args) {

var clientContext = SP.ClientContext.get_current();
var list = clientContext.get_web().get_lists().getByTitle("ListTitle");
var listItem = list.getItemById(1);
clientContext.executeQueryAsync(Function.createDelegate(this, onSuccess), Function.createDelegate(this, onFailure));
  • Thanks for your answer but I am looking for JSOM code.
    – Garima
    Mar 25, 2015 at 11:58
  • Ok. But you can still invoke a REST call from JSOM which will be easier. I will look around and see any JSOM sample is available. Mar 25, 2015 at 11:59
  • @Garima I have added JSOM sample. Mar 25, 2015 at 12:25
  • Thanks Amal. really helpful. I will try this and will let you know.
    – Garima
    Mar 25, 2015 at 12:33
  • Once you've gotten the attachment, how can you use that to retrieve its binary? It looks like this simply shows binary info. If I perform a regular "GET" on the filepath itself, this doesn't seem to return the binary properly for most file types..
    – Dinerdo
    Sep 10, 2015 at 20:40

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