How do I get all child terms of a termset in Sharepoint? - sharepoint

Question

How do I get a flattened version of child terms, or just the last level/tier of terms.
Ex: TermSet -->
Term -->
ChildTerm
How do I grab the child term in an SPFX webpart? I can grab the Terms under the termset, but I cant go any deeper.

Answer 1

Tested code based on this thread(test the code to get term of current site).
private getTermsetWithChildren(termStoreName: string, termsetId: string) {
return new Promise((resolve, reject) => {
//const taxonomy = new Session(siteCollectionURL);
const store: any = taxonomy.termStores.getByName(termStoreName);
store.getTermSetById(termsetId).terms.select('Name', 'Id', 'Parent').get()
.then((data: any[]) => {
let result = [];
// build termset levels
do {
for (let index = 0; index < data.length; index++) {
let currTerm = data[index];
if (currTerm.Parent) {
let parentGuid = currTerm.Parent.Id;
insertChildInParent(result, parentGuid, currTerm, index);
index = index - 1;
} else {
data.splice(index, 1);
index = index - 1;
result.push(currTerm);
}
}
} while (data.length !== 0);
// recursive insert term in parent and delete it from start data array with index
function insertChildInParent(searchArray, parentGuid, currTerm, orgIndex) {
searchArray.forEach(parentItem => {
if (parentItem.Id == parentGuid) {
if (parentItem.children) {
parentItem.children.push(currTerm);
} else {
parentItem.children = [];
parentItem.children.push(currTerm);
}
data.splice(orgIndex, 1);
} else if (parentItem.children) {
// recursive is recursive is recursive
insertChildInParent(parentItem.children, parentGuid, currTerm, orgIndex);
}
});
}
resolve(result);
}).catch(fail => {
console.warn(fail);
reject(fail);
});
});
}
Call the function.
this.getTermsetWithChildren(
'Taxonomy_hAIlyuIrZSNizRU+uUbanA==',
'70719569-ae34-4f24-81b9-0629d68c05aa'
).then(data => {
console.log(data);
});