Can't update title in desktop version of word - ms-word

Question

I have an Office Addin and am trying to update the title of the document on desktop. i have tried 2 diffrent ways and none of them works on hte desktop. It works fine on word online but not on the desktop.
Word.run(async (context) => {
var newTitle = document.getElementById("inputTitle") as HTMLInputElement;
console.log(newTitle.value);
context.document.properties.title = newTitle.value;
});
This code works online but not on the desktop. I have also tried doing doing it in this way.
Office.context.document.customXmlParts.getByNamespaceAsync("http://schemas.openxmlformats.org/package/2006/metadata/core-properties",
function (resultCore) {
var xmlPart = resultCore.value[0];
xmlPart.getNodesAsync('*/*', function (nodeResult) {
for (var i = 0; i < nodeResult.value.length; i++) {
var node = nodeResult.value[i];
console.log("BaseName: ")
console.log(node.baseName);
if (node.baseName === "title") {
var newTitle = document.getElementById("inputTitle") as HTMLInputElement;
console.log("title that you entered: " + newTitle.value);
console.log(node);
node.setNodeValueAsync(newTitle.value, { asyncContext: "StateNormal" }, function (data) { });
}
}
});
});
Does anyone know why it doesn't work or have some other solution to my problem?

Answer 1

The following code works for me, including on desktop. Note that you have to await the Word.run. Also, you have to load the title and then sync to make sure you have changed the title on the actual document and not merely in the proxy object in your task pane code.
await Word.run(async (context) => {
var newTitle = document.getElementById("inputTitle") as HTMLInputElement;
console.log(newTitle.value);
context.document.properties.title = newTitle.value;
const myProperties = context.document.properties.load("title");
await context.sync();
console.log(myProperties.title);
});