Custom File Upload - Script Include not able to accept large sized data if exceeded certain size

[Michael Chang1]

I've created a custom upload attachment UI page and it will pass the file to a ajax function to upload. If upload a normal file with 100kb it working fine. but if upload a 3 MB file, script include will return null value. 

Is there a limit on how much data size a glide ajax can accept?

UI Page Client Script

function uploadFormData(files) {
	document.getElementById("ddArea").classList.add("d-none");
	document.getElementById("loading").classList.remove("d-none");
	document.getElementById("loading").classList.add("d-block");

    fileCount = 0;
    fileLength = files.length;
	
    for (var i = 0; i < files.length; i++) {
        var reader = new FileReader();
        reader.filename = files[i].name;
        reader.filetype = files[i].type;

        // Create an event listener to trigger Ajax funciton after file is read
        reader.onloadend = function(e) {
            var ga = new GlideAjax('utilCredit');
            ga.addParam('sysparm_name', 'uploadAttachment');
		           
            ga.addParam('sysparm_filename', e.target.filename);
            ga.addParam('sysparm_filetype', e.target.filetype);
            ga.addParam('sysparm_sys_id', g_form.getUniqueValue());
			ga.addParam('sysparm_file', e.target.result.toString());
		    ga.getXMLAnswer(getResponse);
						
        };
        reader.readAsDataURL(files[i]);
    }
}


function getResponse(response) {

    fileCount++;
    if (fileCount == fileLength) {
        location.reload();
    }
	
}

Server Side Script Include

//Create Attachment Doc and Upload Attachment
    uploadAttachment: function() {

        try {

            var file = this.getParameter('sysparm_file');
            var filename = this.getParameter('sysparm_filename');
            var filetype = this.getParameter('sysparm_filetype');
            var sys_id = this.getParameter('sysparm_sys_id');

            var gr = new GlideRecord('x_ytlcb_credit_a_0_credit_attachment_doc');
            gr.credit_application = sys_id;
            var sysId = gr.insert();


            var gsa = new GlideSysAttachment();
            var base64String = file.substr(file.indexOf("base64,"), file.length - 1).replace("base64,", "");
            var attachmentId = gsa.writeBase64(gr, filename, filetype, base64String);

            gr.file_upload = attachmentId;
            gr.update();

            var gra = new GlideRecord("sys_attachment");
            gra.addQuery("table_name", 'x_ytlcb_credit_a_0_credit_attachment_doc');
            gra.addQuery("table_sys_id", sysId);
            gra.query();
            if (gra.next()) {
                gra.table_name = "ZZ_YYx_ytlcb_credit_a_0_credit_attachment_doc";
                gra.update();
                new global.VariableUtil().copy(gra.sys_id, 'x_ytlcb_credit_a_0_credit_attachment_doc', sysId);
            }
        } catch (err) {
            return err.message;
        }


        return gr.sys_id;
    },

[Hitoshi Ozawa · Accepted solution]

Hi Michael,

I don't think GlideAjax() is meant to send attachment files. Use Attachment API with streaming instead to process large files.

https://docs.servicenow.com/bundle/sandiego-application-development/page/integrate/custom-web-servic...

https://developer.servicenow.com/print_page.do?release=paris&category=null&identifier=c_AttachmentAP...

[Michael Chang1]

Hi Hitoshi,

Thanks for the help. Manage to get it work using scripted REST API.