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When I create a CPSecureTextField with setEditable: YES (so it acceptsFirstResponder), Safari 3.2.1 and WebKit 5525.27.1 will throw a "NO_MODIFICATION_ALLOWED_ERR: DOM Exception 7" the moment onblur is called.

onblur is defined in CPTextField's becomeFirstResponder method. In the onblur function definition, setObjectValue is being called.

setObjectValue tries to set _DOMTextElement.innerText to displayString, if CPFeatureIsCompatible(CPJavascriptInnerTextFeature) returns true. It does, and the setting of innerText then throws the exception.

Since this only happens for input elements with type set to password (CPSecureTextField, that is) and I haven't checked with other browsers, I'm not sure what to do. A quick fix would be to check for _DOMTextElement.type != "password", ANDing it with the CPFeatureIsCompatible(CPJavascriptInnerTextFeature) check.

But I doubt that would be clean. Since I'm not familiar with CPCompatibility, someone more knowledgable in this regard should look into how to fix this.

What I want to do is have the password field call an action on a target to process a login when hitting the return key. I couldn't get this to work without setEditable set to YES.