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High charts using knockout

Posted on 2015-01-21
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Last Modified: 2015-01-30
I need to implement high chart using knockout binding handlers. ..
I have to dynamically bind Jon data to the chart series to render the chart...
Any help is appreciated
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Question by:Rose Babu
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Expert Comment

by:Steve Bink
ID: 40563201
I just recently implemented Highcharts using a JSON data source.  Since I was hooking Highcharts into an existing process, it was a little messy, but it came out OK.  

What area are you having trouble with?
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Expert Comment

by:Rob Jurd, EE MVE
ID: 40563501
I need to implement high chart using knockout binding handlers. ..
Why? Modifying the data source and redrawing the chart will dynamically update the chart.

As a note, putting the JSON data into a knockout observable and then modifying the JSON data within the observable will NOT trigger knockout to do raise any events.  

I need more information about why you want to include knockout with your chart.
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Author Comment

by:Rose Babu
ID: 40565726
As a note, putting the JSON data into a knockout observable and then modifying the JSON data within the observable will NOT trigger knockout to do raise any events.



Yes it is not triggering ...how can I generate chart in knockout ..With default data it is loading but with json data it s not working
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Author Comment

by:Rose Babu
ID: 40565734
Hi Steve ...I also supposed to generate chart with json value in knockout. .I can generate chart with handlers using default value by cannot make it work dynamically with json call
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Expert Comment

by:Rob Jurd, EE MVE
ID: 40565736
observables only keep track of whether the object is or isn't in the array.  It will not keep track on the properties of your JSON data unless you make them observables as well but that gets tricky with ajax loaded data so we should avoid that for now.

You stiill haven't answered why you need to use knockout?  just load the JSON data via ajax and create the chart.  No need to store the JSON data in a knockout ViewModel.
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Author Comment

by:Rose Babu
ID: 40565737
Hi Steve ...I also supposed to generate chart with json value in knockout. .I can generate chart with handlers using default value but cannot make it work dynamically with json call
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Author Comment

by:Rose Babu
ID: 40565740
My project is fully implemented with that technology
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Accepted Solution

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Rob Jurd, EE MVE earned 500 total points
ID: 40565752
Ok, so it sounds like you're storing the JSON data for the chart in an observable, hoping that any change made to that JSON data will automatically update the chart.  That's not the way knockout works, however you can force it to refresh by simply removing the object from the observable and adding it back in.

Make sense?

e.g. a very simple json example

// some observable that is initialised with null
vm.chart_data = ko.observable(null);
...
ko.applyBindings(vm);
...

// ajax here:
$.ajax({
     ...
     success: function(data) {
         vm.chart_data.removeAll();
         vm.chart_data(data); // reset the data in the observable and trigger a change event for the chart
     }
});

Open in new window

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Expert Comment

by:Rob Jurd, EE MVE
ID: 40565754
If you can post the relevant parts of your code it would really help.
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Author Closing Comment

by:Rose Babu
ID: 40581079
your sample code block helped me to proceed further ..Thanks rob jurd
.I have one more question open for formatting the legends can u suggest some help on that question...
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