• Mrityunjaya Tiwari
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Hello,

I'm doing a 'Visualforce Basics' module and I'm stuck at 'Use Standard Controllers' Unit (link here).
I created a page with the following code:
 
<apex:page>
    <apex:pageBlock title="Account Summary">
        <apex:pageBlockSection>

        </apex:pageBlockSection>
    </apex:pageBlock>
</apex:page>

Then I opened a page via the "Preview" button in a Developer Console and opened a JavaScript console in Chrome where I typed:

$A.get("e.force:navigateToURL").setParams({"url": "/apex/AccSum"}).fire();
And I got the following error:
Uncaught ReferenceError: $A is not defined at <anonymous>:1:1
 

Both the snippets are copied from the Unit's sections, I didn't change anything except the page's name - 'AccSum'. I tried all of the above in a Firefox which also did not work.

Does anyone know what's going on?

I am new to Visualforce and I am doing the Trailhead: Visualforce Basics Module - Use Standard Controllers.  The instructions state:
To preview your page in the context of Lightning Experience, open your browser’s developer console and enter:
$A.get("e.force:navigateToURL").setParams(
    {"url": "/apex/pageName"}).fire();
I am not sure where to enter this.  When I enter it in the Visualforce page the text just show up on the Visualforce page preview.  I must be missing something.  Any help will be greatly appreciated.