Retrieving Entity Metadata in Dynamics 365 with JavaScript

In this post, we will look at how to retrieve Entity Metadata in Dynamics 365 with JavaScript.

Let’s say you want to get the metadata for an entity.

[sourcecode language=”JavaScript”] var req = new XMLHttpRequest();
req.open("GET", Xrm.Utility.getGlobalContext().getClientUrl() + "/api/data/v9.0/EntityDefinitions(LogicalName=’account’)", 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 results = JSON.parse(this.response);
console.log(results);
} else {
Xrm.Utility.alertDialog(this.statusText);
}
}
};
req.send();
[/sourcecode]

Running this, we get:

Let’s say you want to retrieve all attributes for a given entity, We will do this for the account entity.

The code:

[sourcecode language=”JavaScript”] var req = new XMLHttpRequest();
req.open("GET", Xrm.Utility.getGlobalContext().getClientUrl() + "/api/data/v9.0/EntityDefinitions(LogicalName=’account’)/Attributes?$select=SchemaName", 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 results = JSON.parse(this.response);
for (var i = 0; i < results.value.length; i++) {
console.log("Schema Name: " + results.value[i].SchemaName + ", Type: " + results.value[i]["@odata.type"]);
}
} else {
Xrm.Utility.alertDialog(this.statusText);
}
}
};
req.send();
[/sourcecode]

Running this, we get:

For more information, check out here.