HtmlUnit property undefined script error

html, java, javascript

Solution

This was caused my a javascript error on the page that was being loaded. I set the

webClient.getOptions().setThrowExceptionOnScriptError(false);

but it still threw the exception.

SOLUTION: If you catch the ScriptException the page is STILL fully loaded and you can just continue processing and ignoring the exception.

Example of HTML that fails:

<html>
<Head><title>JS Test</title>
    <script type="text/javascript">
        function run_js()
        {
                form.myinput.value = "from on body";
//              document.myform.myinput.value = "from body";
        }
        </script>   
    </head>

<body onload="run_js()">
    The Body.
    <form name="myform">
        <input name="myinput" type="text"/>
    </form>
</body>
</html>

Problem

I’m submitting a form using java HtmlUnit package. I am able to get pages and submit forms but on one page I’m getting a ScriptException error. The message is “Cannot set property "disabled" of undefined to "0"” I think it might be caused by a javascript method that tries to set a variable that has not been declared in the form but I’m not sure. ``` tempForm = MyPage.getFormByName("menu_form"); tempForm.getInputByName("userId").setValueAttribute("myusername"); HtmlPage editSubscriberPage = (HtmlPage) tempForm.getInputByName("submit_button").click(); EcmaError: lineNumber=[824] column=[0] lineSource=[null] name=[TypeError] sourceName=[script in https://labserver.comp.com/mcwebadm/cgi-bin/edit_local.pl?operation=edit&return_address=%2Fmcwebadm%2Fcgi-bin%2Fmenu.pl&selected=2322020c341b11de96c3000423d43f1d from (9, 32) to (840, 15)] message=[TypeError: Cannot set property "disabled" of undefined to "0" (script in https://myserver.company.com/mcwebadm/cgi-bin/edit_local.pl?operation=edit&return_address=%2Fmcwebadm%2Fcgi-bin%2Fmenu.pl&selected=22020c341b11de96c3000423d43f1d from (9, 32) to (840, 15)#824)] com.gargoylesoftware.htmlunit.ScriptException: TypeError: Cannot set property "disabled" of undefined to "0" (script in https://labserver.comp.com/mcwebadm/cgi-bin/edit_local.pl?operation=edit&return_address=%2Fmcwebadm%2Fcgi-bin%2Fmenu.pl&selected=22020c341b11de96c3000423d43f1d from (9, 32) to (840, 15)#824) at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:534) at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:515) at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507) at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:464) at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:992) at com.gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeEventHandler(EventListenersContainer.java:164) at com.gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeBubblingListeners(EventListenersContainer.java:177) at com.gargoylesoftware.htmlunit.javascript.host.Node.fireEvent(Node.java:584) at com.gargoylesoftware.htmlunit.html.HtmlElement$2.run(HtmlElement.java:936) at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:515) at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507) at com.gargoylesoftware.htmlunit.html.HtmlElement.fireEvent(HtmlElement.java:941) at com.gargoylesoftware.htmlunit.html.HtmlPage.executeEventHandlersIfNeeded(HtmlPage.java:1237) at com.gargoylesoftware.htmlunit.html.HtmlPage.initialize(HtmlPage.java:183) at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:449) at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:329) at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:354) at com.gargoylesoftware.htmlunit.html.HtmlForm.submit(HtmlForm.java:179) at com.gargoylesoftware.htmlunit.html.HtmlSubmitInput.doClickAction(HtmlSubmitInput.java:82) at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1329) at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1288) at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1257) at TestOne.run(TestOne.java:77) at TestOne.main(TestOne.java:215) ```

Original source