Nodered 5.0 Editor fails open Function Tab

Hubertus · 10 June 2026 11:45

Hello.
when I reload Node-RED in the browser, I can edit a function node.

If I close the node and want to edit it again—or any other function node—the editor doesn't appear.

Only after reloading Node-RED in the browser can a single function node be edited once. Then I have to reload again. Tested with Chrome and Internet Explorer.

Best regards
Hubertus

Steve-Mcl · 10 June 2026 12:00

Can you check your browsers dev tools console for errors and let us know please.

Hubertus · 10 June 2026 12:08

This appears after double-clicking the function node.
Is that what you meant?

inject.js:101 [Violation] Added non-passive event listener to a scroll-blocking 'mousewheel' event. Consider marking event handler as 'passive' to make the page more responsive. See https://www.chromestatus.com/feature/5745543795965952
l	@	inject.js:101
add	@	vendor.js?v=730435635d59:2
(anonymous)	@	vendor.js?v=730435635d59:3
(anonymous)	@	vendor.js?v=730435635d59:3
(anonymous)	@	vendor.js?v=730435635d59:2
each	@	vendor.js?v=730435635d59:2
each	@	vendor.js?v=730435635d59:2
Le	@	vendor.js?v=730435635d59:2
on	@	vendor.js?v=730435635d59:2
(anonymous)	@	vendor.js?v=730435635d59:8
each	@	vendor.js?v=730435635d59:2
_on	@	vendor.js?v=730435635d59:8
_create	@	vendor.js?v=730435635d59:8
(anonymous)	@	vendor.js?v=730435635d59:8
_createWidget	@	vendor.js?v=730435635d59:8
(anonymous)	@	vendor.js?v=730435635d59:8
(anonymous)	@	vendor.js?v=730435635d59:8
each	@	vendor.js?v=730435635d59:2
each	@	vendor.js?v=730435635d59:2
(anonymous)	@	vendor.js?v=730435635d59:8
oneditprepare	@	VM309:389
H	@	red.min.js?v=730435635d59:97
y	@	red.min.js?v=730435635d59:97
open	@	red.min.js?v=730435635d59:97
t	@	red.min.js?v=730435635d59:179
show	@	red.min.js?v=730435635d59:179
_	@	red.min.js?v=730435635d59:97
Ui	@	red.min.js?v=730435635d59:97
i	@	vendor.js?v=730435635d59:26
red.min.js?v=730435635d59:97 oneditprepare 5d19664d4281f23f function TypeError: Assignment to constant variable.
red.min.js?v=730435635d59:97 TypeError: Assignment to constant variable.
    at Object.L [as create] (red.min.js?v=730435635d59:171:11)
    at Object.B [as create] (red.min.js?v=730435635d59:98:2756)
    at Object.createEditor (red.min.js?v=730435635d59:97:252369)
    at buildEditor (<anonymous>:410:43)
    at Proxy.oneditprepare (<anonymous>:443:31)
    at H (red.min.js?v=730435635d59:97:225399)
    at y (red.min.js?v=730435635d59:97:226352)
    at Object.open (red.min.js?v=730435635d59:97:235561)
    at t (red.min.js?v=730435635d59:179:3187)
    at Object.show (red.min.js?v=730435635d59:179:4562)
red.min.js?v=730435635d59:97 oneditresize 5d19664d4281f23f function TypeError: Cannot read properties of undefined (reading 'resize')
vendor.js?v=730435635d59:26 [Violation] 'mouseup' handler took 166ms
5
[Violation] Forced reflow while executing JavaScript took <N>ms
[Violation] Forced reflow while executing JavaScript took 31ms
[Violation] Forced reflow while executing JavaScript took 45ms
[Violation] Forced reflow while executing JavaScript took 49ms
[Violation] Forced reflow while executing JavaScript took 30ms
[Violation] Forced reflow while executing JavaScript took 273ms
red.min.js?v=730435635d59:97 oneditresize 5d19664d4281f23f function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:179 [Violation] 'setTimeout' handler took 83ms
red.min.js?v=730435635d59:97 oneditresize 5d19664d4281f23f function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:16 [Violation] 'message' handler took 177ms
red.min.js?v=730435635d59:16 [Violation] 'message' handler took 581ms

Hubertus · 10 June 2026 13:06

Maybe that's another clue—when I change the editor from Monaco to Ace in the settings.js file, everything works fine.

But the coding competition is a lost cause—no way

Steve-Mcl · 10 June 2026 13:44

I am not seeing this. in my browser.

What browser (and version) are you using?

Regarding, the error, red.min.js?v=730435635d59:97 TypeError: Assignment to constant variable. can you click on this and capture the code above and below this - there may be a bug.

Hubertus · 10 June 2026 14:26

First the console log:

TypeError: Assignment to constant variable.
    at Object.L [as create] (red.min.js:171:11)
    at Object.B [as create] (red.min.js:98:2756)
    at Object.createEditor (red.min.js:97:252369)
    at buildEditor (<anonymous>:410:43)
    at Proxy.oneditprepare (<anonymous>:443:31)
    at H (red.min.js:97:225399)
    at y (red.min.js:97:226352)
    at Object.open (red.min.js:97:235561)
    at t (red.min.js:179:3187)
    at Object.show (red.min.js:179:4562)
red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')
9red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')

see "undefined (reading resize)"

the code:

RED.editor.registerEditPane("editor-tab-properties", function(x) {
        return {
            label: RED._("editor-tab.properties"),
            name: RED._("editor-tab.properties"),
            iconClass: "fa fa-cog",
            create: function(k) {
                var b = x.type;
                x.type === "subflow" ? b = "subflow-template" : x.type.substring(0, 8) == "subflow:" && (b = "subflow");
                var t;
                x._def.set.module === "node-red" ? t = "node-red" : t = x._def.set.id;
                var g = "dialog-form";
                this.inputClass = "node-input",
                x._def.category === "config" && b !== "group" ? (this.inputClass = "node-config-input",
                g = "node-config-dialog-edit-form") : x.type === "subflow" && (this.inputClass = "subflow-input"),
                RED.editor.buildEditForm(k, g, b, t, x)
            },
            resize: function(k) {
                if (x && x._def.oneditresize)
                    try {
                        x._def.oneditresize.call(x, k)
                    } catch (b) {
                        console.log("oneditresize", x.id, x.type, b.toString())
                    }
            },
            close: function() {},
            apply: function(k) {
                var b, t;
                if (x._def.defaults) {
                    for (t in x._def.defaults)
                        if (x._def.defaults.hasOwnProperty(t)) {
                            var g = $("#" + this.inputClass + "-" + t);
                            if (g.attr("type") === "checkbox" ? b = g.prop("checked") : g.prop("nodeName") === "select" && g.attr("multiple") === "multiple" ? (b = g.val(),
                            b == null && (b = [])) : "format"in x._def.defaults[t] && x._def.defaults[t].format !== "" && g[0].nodeName === "DIV" ? b = g.text() : b = g.val(),
                            b != null) {
                                if (t === "outputs") {
                                    if (b.trim() === "")
                                        continue;
                                    if (isNaN(b)) {

My browsers to test this:

Topic		Replies	Views
Function node not working after update General	16	689	15 November 2022
Unable to edit function nodes after update (only with Monaco; ace works fine) General	4	352	18 October 2022
Unable to edit function part of function node General	6	1496	30 March 2019
Cannot get the Functions in node red to edit General	24	2007	4 November 2022
Bug in function editor (Cannot redeclare block-scoped variable) General function-node	24	408	21 December 2023

Nodered 5.0 Editor fails open Function Tab

Related topics