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KnockoutJS Web Development

You're reading from   KnockoutJS Web Development Efficiently work with data, web templates, and custom HTML tags using KnockoutJS

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Product type Paperback
Published in Feb 2015
Publisher
ISBN-13 9781782161028
Length 178 pages
Edition 1st Edition
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Author (1):
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John Farrar John Farrar
Author Profile Icon John Farrar
John Farrar
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Toc

Merging mapped data


There are times you may want to pull data into your ViewModel from multiple sources. When doing this you can create a map for each source. If the source variables have the same name they will overwrite the existing variables. As long as the base variable is a different name it will merge them into the ViewModel. Do this as follows:

myViewModel = ko.mapping.fromJS(firstData, firstMap);
ko.mapping.fromJS(nextData, nextMap, myViewModel);

What you get is a combination of the firstData JavaScript structure, mapped with firstMap, combined with the nextData JavaScript structure, and with the nextMap mapping. If there are any duplicate base structures in nextData, they will override the same structures in the existing firstData JavaScript structure.

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