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Can I run suitelet by adding a button in UE script without client script?
I have added a button using beforeLoad entry in UE
```                var suiteletButton = form.addButton({
                  id: 'custpage_suitelet_button',
                  label: 'Open Suitelet',
                  functionName: 'window.open(' + suiteletURL + ')'
                });```
And I defined suiteletURL above this code.
```                let suiteletURL = url.resolveScript({
                    scriptId: 'customscript_script_id',
                    deploymentId: 'customdeploy_script_id',
                    params: {                        
                    },
                    returnExternalUrl: false
                });```
I can see the button but clicking that button nothing happens. How can I make that button work?

It should work. But if you have attached a client script through the UE script as well, NS will add additional code around your “functionName”
Right click and inspect the button to see what the actual onClick function is

your functionName is being used as a string passed to <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval|eval>

the string you are passing it is not valid javascript, so you get an error, probably syntax related