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How to set null in a option set attribute with the help of web API

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Posted on by Abdul Wahab

12,085 Moderator

Hi All,

I am using below code to update an entity.

function UpdateOrphan(_formContext) {
    var entityUpdate = {};
    var newAcademicLevel = GetNewAcademicLevel(_formContext),
        oldAcademicLevel = GetOldAcademicLevel(_formContext);
    if (newAcademicLevel) {
        entityUpdate[orphanFields.CurrentAcademicLevel] = newAcademicLevel;
    } else if (oldAcademicLevel) {
        entityUpdate[orphanFields.CurrentAcademicLevel] = null;
    }
    var orphan = GetOrphan(_formContext);
    UpdateAndReturnUpdateStatus(entityUpdate, orphan[0].id, globalVariables.WebAPIVersion, entitys.Orphans);
}

function UpdateAndReturnUpdateStatus(entity, recordID, webAPIVersion, entitysPluralName) {
    recordID = recordID.replace(/[{}]/g, "");

    var req = new XMLHttpRequest();
    req.open("PATCH", Xrm.Page.context.getClientUrl() + "/api/data/" + webAPIVersion + "/" + entitysPluralName + "(" + recordID + ")", false);//Sync
    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.onreadystatechange = function () {
        if (this.readyState === 4) {
            req.onreadystatechange = null;
            if (this.status === 204) {
                globalVariables.UpdateStatus = true;
            }
            else {
                Xrm.Utility.alertDialog(this.statusText);
            }
        }
    };
    req.send(JSON.stringify(entity));
}

I am not able to set null with this code. I am receiving 204 in the return.

What is wrong in my code?

Thanks

Regards,

AW

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a33ik 84,331 Most Valuable Professional on at

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RE: How to set null in a option set attribute with the help of web API

Hello,

I would recommend to use fiddler to check what request is sent to server and provide correspond schreenshot here.

I'm suspicious that your code doesn't set field to null value or something on the backend sets field back - plugin or workflow.

PS FYI 204 ststus is absolutely normal response - it means that there was no data returned as a response.

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