You mentioned that you are "utilizing data from an API to bind it to tree nodes". Based on this information, I assume that the data required to construct the tree is retrieved through the
this.roleservice.getRulesbyUserRoleId(row.userroleid)
method call. Following
the execution of this call, you attempt to expand all nodes in the tree using the
expandAll() method.
However, there is a slight issue with this approach. Analyzing your code reveals that the getRulesbyUserRoleId(...) call is asynchronous and returns an Observable.
To provide clarity on the matter, I have reformatted your code snippet to highlight the problem:
addrule(row, ruleValue) {
this.roleservice.getRulesbyUserRoleId(row.userroleid)
.subscribe(
result => this.getRulebyUserRoleIdSuccess(result,row),
error => this.getRulebyUserRoleIdError(error)
);
this.treecreate.treeModel.expandAll();
}
Here's what occurs in the revised structure:
What does this signify? Assuming that the
this.getRulebyUserRoleIdSuccess(result,row)
method is responsible for constructing the tree with the data obtained from the service call, it suggests that the tree may not be accessible until this method is executed –
could it be that you set the this.treecreate variable within the getRulebyUserRoleIdSuccess method??.
As previously stated, there is no assurance that the
this.getRulebyUserRoleIdSuccess(result,row)
function will run prior to
this.treecreate.treeModel.expandAll()
(in fact, quite the opposite), meaning you may be attempting to expand the tree before creating it initially.
This aligns with your other observations where the button triggering the same
expandAll() method functions as expected –
as by the time you press the button, the tree has been already generated.
If this scenario aligns with your situation and based on my assumptions from the provided details, rectifying the issue appears straightforward: relocate the expandAll() invocation so that it executes after the tree formation. A potential solution could look like this:
addrule(row, ruleValue) {
this.roleservice.getRulesbyUserRoleId(row.userroleid)
.subscribe(
result => {
this.getRulebyUserRoleIdSuccess(result,row);
this.treecreate.treeModel.expandAll();
},
error => this.getRulebyUserRoleIdError(error)
);
}
Lastly, as a precautionary note: assuming this indeed addresses your challenge, it is uncertain whether this stemmed from a typing error or oversight (or potentially working with someone else’s code), or if you might require more familiarity with JavaScript Promises/Observables handling. In such a case, I recommend exploring online resources or tutorials to enhance your understanding, as while promise concepts are relatively simple, incomplete comprehension can lead to significant confusion.