I wrote a function that fetches the guid of a lookup field and uses that to make a Web API call. This is the the call that I made:
fetchOptionSet: function (executionContext) {
var formContext = executionContext.getFormContext(); //get form context
var client = Xrm.Page.context.getClientUrl(); //get client url
var childId = formContext.getAttribute("new_childid").getValue()[0].id;
var child = childId.replace(/[{}]/g, "");
var contract;
var req = new XMLHttpRequest();
req.open("GET", client + `/api/data/v8.2/new_childallergieses(${child})?$select=_new_childid_value`, true);
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");
req.onreadystatechange = function () {
if (this.readyState === 4) {
req.onreadystatechange = null;
if (this.status === 200) {
var result = JSON.parse(this.response);
var _new_childid_value = result["_new_childid_value"];
contract = _new_childid_value.replace(/[{}]/g, "");
} else {
Xrm.Utility.alertDialog(this.statusText);
}
}
};
req.send();
However, I get a bad request every time that the script runs. I need the guid returned by the call (contractid) to make another AJAX call! The url is rendered fine, but this.readyState is undefined!
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