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I am using REST API to for getting data from SharePoint.

I have one list like category with three column Title and two lookup name like childcategory, parentcategory.

I have some data in which there is no value in both lookup child and parent category.

now I fire query to fetch data expanding lookup value with its Title and ID.

so I'm getting data but in some data of lookup where I didn't get any key value for expanded title and ID

Response I get like below :

"ChildCategory":{"__deferred":{"uri":"https://xyz.sharepoint.com/sites/abc/_api/Web/Lists(guid'156456416')/Items(6)/ChildCategory"}}

and in some row have data in lookup that data in response look like this:

"SubCategory":{"__deferred":{"uri":"https://xyz.sharepoint.com/sites/abc/_api/Web/Lists(guid'156456416')/Items(8)/SubCategory"},
Title:"abc",
ID:10}

so now how can I parse this json.??

because if I am trying to get Value using Key like Title. so it give JSONException because in some data it don't have that key like first which I have posted response.

How to solve this problem?

Any help greatly appreciated.

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It seems ChildCategory and SubCategory are not required column. So at the time of parsing your JSON, you need a condition.

if(ChildCategory.Title && ChildCategory.ID){

}

Another option can be $filter. Just $filter null values for ID and Title so that they do not appear in the result.

&$filter=ChildCategory/Title ne null and ChildCategory/ID ne null
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  • sir in json parsing if i am trying to getString using Title. then it give exception for it.if there is not value for title in subcategory. i have one solution to handle that exception .but without it. there is any option in sharepoint if lookup column null then i get value like title="null" ID="null" which we get when text column null. same is possible in lookup.? – Vishal Thakkar Jul 25 '16 at 7:04
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    Even in Android development you should not, never, nimmer, nooit parse JSON results as if they are Strings. Learn about JSON.parse and hasOwnProperty. Atish his answer works because checking for a non-existing property returns undefined, which is a FALSE value. – Danny '365CSI' Engelman Jul 25 '16 at 7:06
  • There is no way to get values like title="null" ID="null". It's better to use $filter for null values. That means null values will not appear in the result. – Atish Dipongkor - MVP Jul 25 '16 at 7:07
  • @AtishDipongkor i want that record title if there lookup null then – Vishal Thakkar Jul 25 '16 at 8:59
  • Then you have to consider condition. Another question. What are you using to parse JSON javascript or JAVA? @AndroidDeveloper – Atish Dipongkor - MVP Jul 25 '16 at 9:02
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I am checked using JsonObject.has("KeyName") it return boolean.

its give true if object contain that keyvalue.

so using this method you can make your logic.

Thank you very much for reply.

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I had a similar issue when checking a person field to see it was not empty. Looking for Title didn't work for me. I tried to see if "__deferred" didn't exist and that DID work. Once I getting it working, I don't ask why and just move on. I'll leave that to someone smarter than me.

if (!(ChildCategory.hasOwnProperty('__deferred'))) { 
    alert('result is not empty');
}
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