Disable submit button via client script

[Ariomar de Deus]

I have an onchange client script and I need the submit button to be disabled if the field is empty. I tried this method, but it's not working. Could someone help me disable this field when it's empty?

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading) {
        return;
    }

    // Se o campo estiver vazio, desabilita o Submit
    if (!newValue || newValue.trim() === '') {
        g_form.setSubmitEnabled(false);
    } else {
        // Se houver imagem, habilita o Submit
        g_form.setSubmitEnabled(true);
    }
}

[Brad Bowman]

If the record should not be submitted if this field is blank and the field is updated by a different script/process you can either not allow this field to be updated to blank by that process, so prevent the update upstream, or return 'false' in an onSubmit Client Script.

[Brad Bowman]

Since the field is hidden, what is changing the field to trigger your onChange Client Script?  This use case is not making a lot of sense.

[Ankur Bawiskar]

@Ariomar de Deus 

that's not recommended approach.

you can use onSubmit script and stop form submission based on field value

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