Olympic heptathlon bronze medallist Kelly Sotherton was fourth with a personal best of 8.21.
Ennis, 26, who is from Sheffield, won heptathlon gold at the 2012 Games.
England's Louise Hazel is well placed in the heptathlon after she finished the first day of competition in third place.
"Never say never but my body isn't going to be able cope with the stresses of a heptathlon, " said Sotherton.
BBC: Sotherton eyes 400m after injuries end heptathlon hopes
Heptathlon winner Ennis said the Queen had told her "the summer was amazing" and asked how her training was going.
BBC: Jessica Ennis among London 2012 stars honoured at palace
Heptathlon hasn't moved on that far - if you can get to 6, 400 or 6, 500 points, you're fighting for medals.
London 2012 heptathlon champion Jessica Ennis is among people from South Yorkshire recognised in the Queen's New Year Honours list.
In other events, Englishman Tony Jarrett won the 110m hurdles, while Denise Lewis retained her heptathlon title with ease.
The Olympic heptathlon gold medallist reached 6.66m to better Johnson's mark of 6.52m - her second personal best inside a week.
Olympians honoured included heptathlon winner Jessica Ennis, who received the CBE and Team GB cycling boss Dave Brailsford who was knighted.
Heptathlon is a layering event: every year you pick one or two events to focus on while keeping the others going.
"It was a long time coming, " said Idowu, whose medal was Britain's second of the meet, after Jessica Ennis's heptathlon gold.
But 3 August - the start of the women's heptathlon featuring Jessica Ennis - was the busiest day as a whole.
Reports had suggested a foot injury would prevent the 24-year-old adding to the world heptathlon gold medal she won in Berlin last year.
Joyner-Kersee, now 50, won six medals, including three golds, in the heptathlon and long jump, over four Olympics, from 1982 through 1996.
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She toured the Olympic track draped in a Union Jack -- and taking the other heptathlon competitors along with her for the ride.
It was almost an afterthought that Eaton, already the indoor world-record holder in the heptathlon, broke Dan O'Brien's 20-year-old American record of 8, 891 points.
She ran a personal best of 12.54 seconds in the 100m hurdles on the first morning of competition, the fastest time in heptathlon history.
Ennis was one of the faces of London 2012, delighting British fans in the Olympic Stadium by clinching heptathlon gold at her home Games.
Ennis came up just 45 points shy of the magical 7, 000 mark for the seven events, which was the fifth best tally in heptathlon history.
The weekend saw Team GB pick up eight gold medals after wins for the likes of Andy Murray in tennis and Jessica Ennis in the heptathlon.
As well as finishing fourth in the heptathlon at the 2008 Olympics in Beijing, the Birmingham-based athlete also claimed a fifth-placed finish in the women's 4x400m relay.
BBC: Sotherton eyes 400m after injuries end heptathlon hopes
Lewis is competing in this weekend's European Cup of combined events in Tallinn in her first heptathlon since she gave birth to daughter Lauryn in April last year.
"I'm looking forward to the challenge of qualifying for what should be a superb team in 2012, " said Sotherton, who also won heptathlon gold at the 2006 Commonwealth Games.
BBC: Sotherton eyes 400m after injuries end heptathlon hopes
Jessica Ennis claimed Britain's first world heptathlon title as she capped a dominant weekend by winning the final heat of the 800m on Sunday night to finish 238 points ahead.
But several high-profile figures, including Olympic and world heptathlon bronze medallist Kelly Sotherton, Olympics Minister Tessa Jowell and ex-London mayor Ken Livingstone have questioned switching its use from athletics to football.
BBC: UK Athletics boss Ed Warner boosts West Ham's 2012 plan
Christina Kluft took the women's heptathlon gold on Saturday.
After the show, which both School Reporters enjoyed, it was back into reporting mode as they tracked down world light-welterweight champion Amir Khan and world heptathlon champion Jessica Ennis for further interviews.
World and European heptathlon Ennis is set to compete in the pentathlon, having recovered from the ankle injury that led to her pulling out of last weekend's Aviva Grand Prix in Birmingham.
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