Determine if the JSON lacks an array within it

Utilizing an API to fetch results, the response received looks something like the following:

{"currentPage":1,"numberOfPages":1,"totalResults":1,"data":[{"id":"Sf8xxo","name":"The Bear Reader Huckleberry Oatmeal Stout","nameDisplay":"The Bear Reader Huckleberry Oatmeal Stout","abv":"6.3","ibu":"33","styleId":21,"isOrganic":"N","status":"verified","statusDisplay":"Verified","createDate":"2015-03-22 17:35:03","updateDate":"2015-03-22 17:35:03","style":{"id":21,"categoryId":1,"category":{"id":1,"name":"British Origin Ales","createDate":"2012-03-21 20:06:45"},"name":"Oatmeal Stout","shortName":"Oatmeal Stout","description":"Oatmeal stouts include oatmeal in their grist, resulting in a pleasant, full flavor and a smooth profile that is rich without being grainy. A roasted malt character which is caramel-like and chocolate-like should be evident - smooth and not bitter. Coffee-like roasted barley and roasted malt aromas (chocolate and nut-like) are prominent. Color is dark brown to black. Bitterness is moderate, not high. Hop flavor and aroma are optional but should not overpower the overall balance if present. This is a medium- to full-bodied beer, with minimal fruity esters. Diacetyl should be absent or at extremely low levels. Original gravity range and alcohol levels are indicative of English tradition of oatmeal stout.","ibuMin":"20","ibuMax":"40","abvMin":"3.8","abvMax":"6","srmMin":"20","srmMax":"20","ogMin":"1.038","fgMin":"1.008","fgMax":"1.02","createDate":"2012-03-21 20:06:45","updateDate":"2015-04-07 15:22:53"},"breweries":[{"id":"m2lpu3","name":"Timeless Pints Brewing Company","description":"Lakewood's first microbrewery! \r\n\r\nOn Father's Day, several years ago, my son and I purchased a home brewing kit for my husband. As an Engineer and a lover of craft beer, he was excited to experiment with his own concoctions. Since his first trial run, he's produced multiple variety of stouts, ales, lagers and IPA's as well as very happy friends, family and neighbors. His love for the unique keeps him constantly in search of \"new and different\" ingredients and the hope of a perfect combination.\r\n\r\nOne hot July evening, some friends disclosed they were embarking on a new restaurant idea. They asked Chris (my husband) if he would brew the beer specifically for their new endeavor. The ABC frowns on beer sold without the proper licensing and selling from the kitchen counter is not a viable option. Thus a new venture began.\r\n\r\nWhat was once a dream is now a reality and we can now bring our own craft beer to our local Lakewood\/Long Beach community. You'll find us just behind the Long Beach Airport.","website":"http:\/\/www.timelesspints.com\/","established":"2013","isOrganic":"N","images":{"icon":"https:\/\/s3.amazonaws.com\/brewerydbapi\/brewery\/m2lpu3\/upload_v1fZ28-icon.png","medium":"https:\/\/s3.amazonaws.com\/brewerydbapi\/brewery\/m2lpu3\/upload_v1fZ28-medium.png","large":"https:\/\/s3.amazonaws.com\/brewerydbapi\/brewery\/m2lpu3\/upload_v1fZ28-large.png"},"status":"verified","statusDisplay":"Verified","createDate":"2013-08-03 22:49:34","updateDate":"2013-08-04 13:19:27","locations":[{"id":"3wVSu9","name":"Main Brewery","streetAddress":"3671 Industry Avenue","extendedAddress":"C1","locality":"Lakewood","region":"California","postalCode":"90712","phone":"(562) 490-0099","website":"http:\/\/www.timelesspints.com\/","hoursOfOperation":"Thu: 4:00 pm - 8:00 pm\r\nFri: 2:00 pm - 8:00 pm\r\nSat: 12:00 pm - 7:00 pm\r\nSun: 12:00 pm - 5:00 pm","latitude":33.8237257,"longitude":-118.1655833,"isPrimary":"Y","inPlanning":"N","isClosed":"N","openToPublic":"Y","locationType":"nano","locationTypeDisplay":"Nano Brewery","countryIsoCode":"US","yearOpened":"2013","status":"verified","statusDisplay":"Verified","createDate":"2013-08-04 13:19:09","updateDate":"2014-07-23 19:11:34","country":{"isoCode":"US","name":"UNITED STATES","displayName":"United States","isoThree":"USA","numberCode":840,"createDate":"2012-01-03 02:41:33"}}]}],"type":"beer"}],"status":"success"}

However, in cases where no results are returned, the JSON structure is as follows:

{"currentPage":1,"status":"success"}

To check if the above result has been retrieved, the JSON data is stored in a javascript variable called 'data'.

In order to determine if the JSON within 'data' does not contain any results, the following JavaScript code is attempted:

if (data.data.length === undefined || data.data.length === null ) {
    $('#modal1').closeModal();
    Materialize.toast('Rate More Beers to See Statistics', 9000) // 4000 is the duration of the toast
}

Alternatively, another approach that has been tried involves:

if (data.data === undefined || data.data === null ) {
    $('#modal1').closeModal();
    Materialize.toast('Rate More Beers to See Statistics', 9000) // 4000 is the duration of the toast
}

Answer №1

To determine whether the data is undefined, follow these steps:

To check if a variable is undefined, utilize the typeof method.

If you want to verify if a variable is null, you can usually use !variable. However, keep in mind that if the variable is equal to 0, it will be treated as false.

if (typeof data.data === 'undefined' || data.data === null ) {
    $('#modal1').closeModal();
    Materialize.toast('Rate More Beers to See Statistics', 9000)
}

The typeof function provides a string representation of the variable type. In this case, it returns 'undefined' for comparison.

In the following example: Note: this is incorrect

var data = {"currentPage":1,"status":"success"}; 
// note that data.data = 'undefined'

// so when you do
if (data.data.length === 'undefined')  
// results in 'undefined'.data.length
// 'undefined' doesn't have data and will lead to an error

Answer №2

In the event that data consistently appears in the initial level of the JSON response (i.e. at the same hierarchy as currentPage), you can verify it with the following code snippet:

// Let's say variable `response` holds the JSON data
if ('data' in response) {
  // Data has been received
}

Answer №3

To check for the presence of data.data, utilize this code snippet:

if (data.data) {
    // Execute code that relies on data.data
} else {
    $("#modal1").hideModal();
    Materialize.toast('Please Rate More Beers to View Statistics', 9000);
}

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