http://hubtest.atspace.cc/json.html
in the above JSON response, I need to obtain the LAST objectId value to use as part of another URL. What is the best way to do this with javascript?
I attempted it with regex, but it got too messy. I'm assuming there is an easier way.
Try JSON.parse(...) on the source (since it is literally JSON) and then just treat it like an object literal.
Since it's an array you can do var array = JSON.parse(...) then get array[array.length - 1].objectID.
Basically,
var lastObj = a[a.length - 1];
returns back the last object in the array. Then, you can access its properties;
var objectID = lastObj['objectId'];
Shortcut
var objectID = a[a.length - 1]['objectId'];
Array.length returns total elements in array, and because numbers are zero-based, taking 1 off the length gets the last index. eg. for an array with 6 elements, the last element index is 5 (6-1) = 5 )
Working Snippet, I trimmed objects down to 2.
var a = [{
"type": "PAPER",
"data": null,
"proceedingNumber": "IPR2016-00546",
"petitionId": "1463786",
"mimeType": null,
"fileName": "'306 Petition.pdf",
"partyGroupType": "petitioner",
"proceedingPartyGroupId": null,
"availability": "PUBLIC",
"documentName": "Petition For Inter Partes Review U.S. Patent No. 8,772,306",
"pageCount": "0",
"documentType": "16",
"exhibitNumber": null,
"petitionVO": null,
"institutionDecisionVO": null,
"terminationDecisionVO": null,
"proceedingReqType": null,
"proceedingReqTypeId": null,
"proceedingReqTypeStatusId": null,
"appealId": null,
"internalUserProxyEmail": null,
"proceedingId": "1463786",
"paperType": "16",
"documentTypeId": 16,
"customMotionTypeName": null,
"otherMotionType": null,
"objectId": "d29ya3NwYWNlOi8vU3BhY2VzU3RvcmUvNGVjOGFjMzQtODI5Yi00OTZhLTg0ZDItMDU2NTQzNmQ4NTI0OzEuMA==",
"objectType": null,
"artifactSubmissionId": "84644821",
"exhibitSequenceNumber": null,
"dateAdded": "02/02/2016",
"uploadStatus": null,
"expungedFlag": "N",
"deletedFlag": null,
"docVersionLabel": null,
"filingDate": "02/02/2016",
"proceedingArtifactId": "169264898",
"artifactNumber": "1",
"petitionState": null,
"patentNumber": null,
"fileSize": 0,
"submitterId": 11915,
"comment": null,
"createdbyAuthorName": null,
"disableSelect": null,
"employeeId": null,
"lockControlNo": 0,
"paperTypeName": "Petition",
"proceedingPartyId": null,
"filingParty": "petitioner",
"documentCategory": null,
"showExpungeAction": false,
"showUnExpungeAction": false,
"showDownloadLink": true,
"skipUploadTaskRecord": false,
"showEditLink": true,
"inputStream": null
}, {
"type": "PAPER",
"data": null,
"proceedingNumber": "IPR2016-00546",
"petitionId": "1463786",
"mimeType": null,
"fileName": "306 Exhibit List.pdf",
"partyGroupType": "petitioner",
"proceedingPartyGroupId": null,
"availability": "PUBLIC",
"documentName": "Exhibit List",
"pageCount": "0",
"documentType": "16",
"exhibitNumber": null,
"petitionVO": null,
"institutionDecisionVO": null,
"terminationDecisionVO": null,
"proceedingReqType": null,
"proceedingReqTypeId": null,
"proceedingReqTypeStatusId": null,
"appealId": null,
"internalUserProxyEmail": null,
"proceedingId": "1463786",
"paperType": "16",
"documentTypeId": 16,
"customMotionTypeName": null,
"otherMotionType": null,
"objectId": "d29ya3NwYWNlOi8vU3BhY2VzU3RvcmUvNDBhMjRjMmQtYWZkZi00OTdlLThkN2ItZGQ2ZTE5MmVjMWVkOzEuMA==",
"objectType": null,
"artifactSubmissionId": "84644822",
"exhibitSequenceNumber": null,
"dateAdded": "02/02/2016",
"uploadStatus": null,
"expungedFlag": "N",
"deletedFlag": null,
"docVersionLabel": null,
"filingDate": "02/02/2016",
"proceedingArtifactId": "169264900",
"artifactNumber": "2",
"petitionState": null,
"patentNumber": null,
"fileSize": 0,
"submitterId": 11915,
"comment": null,
"createdbyAuthorName": null,
"disableSelect": null,
"employeeId": null,
"lockControlNo": 0,
"paperTypeName": "Petition",
"proceedingPartyId": null,
"filingParty": "petitioner",
"documentCategory": null,
"showExpungeAction": false,
"showUnExpungeAction": false,
"showDownloadLink": true,
"skipUploadTaskRecord": false,
"showEditLink": true,
"inputStream": null
}]
console.log(a[a.length - 1]['objectId']);
