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Revision as of 14:32, 7 August 2020
, 14:32, 7 August 2020→JavaScript example
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*The jQuery get request takes the api URL as first parameter and the function to deal with the returned result as third parameter | *The jQuery get request takes the api URL as first parameter and the function to deal with the returned result as third parameter | ||
*The middle parameter is irrelevant in this context as only one object instance is returned, but if the qet was returning multiple results, "limit=1" would only return the first result | *The middle parameter is irrelevant in this context as only one object instance is returned, but if the qet was returning multiple results, "limit=1" would only return the first result | ||
*The function takes as its sole parameter an Object, this is what is returned by the api, | *The function takes as its sole parameter an Object (a JavaScript Object is a collection of properties), this is what is returned by the api, an object can be given any variable name | ||
*In JavaScript if a variable is defined outside the function, then given a value inside the function, that value can be accessed by later code outside the function (in my case by code within the other functions for calculating each derived value) | *In JavaScript if a variable is defined outside the function, then given a value inside the function, that value can be accessed by later code outside the function (in my case by code within the other functions for calculating each derived value) | ||
* | *We are only interested in 3 of the '''property_name = property_value''' items in the Object. | ||
* | *The JavaScript '''refinement''' syntax (starts with a dot) can be used to find the value for any parameter we name. We assign the variable already defined to the object and its refinement (that specifies the attribute we want). | ||
*The console.log command simply outputs all the items in the list within the brackets into the browser console that in many browsers is displayed by selecting '''F12''' on the keyboard. I included this instead of the lengthy rest of my code that uses the units to do the various calculations correctly. | *The console.log command simply outputs all the items in the list within the brackets into the browser console that in many browsers is displayed by selecting '''F12''' on the keyboard. I included this instead of the lengthy rest of my code that uses the units to do the various calculations correctly. | ||