Unable to Udpate SharePoint List Item using JSOM

Question

I had written the code to update the Column using ID.And on-success function I am able to see the updated value through alert. But in sharepoint list the column remains with default value.

Can any one help me out of this strange problem

function addprfcode(prfid)
{
    alert("Now We are In PRFFunciton to Update PRF Code");
    var clientContext = new SP.ClientContext.get_current();
    alert("Got Current SIte");
    var oList = clientContext.get_web().get_lists().getByTitle('PRF');
    alert("Got Current List");
    var camlQuery = new SP.CamlQuery();
    alert("Initialized Caml Query");
    camlQuery.set_viewXml("<View><Query><Where><Eq><FieldRef Name='ID' /><Value Type='Counter'>"+prfid +"</Value></Eq></Where></Query></View>");
    alert("Executed the Query");
    this.collListItem = oList.getItems(camlQuery);
    clientContext.load(collListItem);
    clientContext.executeQueryAsync(Function.createDelegate(this, this.updateprfcode), Function.createDelegate(this, this.onQueryFailed));

}

function updateprfcode(sender, args)
{
    var prfcode=document.getElementById("prfidcode").value;
    var listItemEnumerator = collListItem.getEnumerator();
    // alert("listItemEnumerator in PRF  is.."+listItemEnumerator);
    while (listItemEnumerator.moveNext()) {
        var oListItem = listItemEnumerator.get_current();
        alert('Before Updated PRFCODE is ' + oListItem.get_item('GenPRFID'));
        oListItem.set_item('GenPRFID',prfcode);
        alert('After Updated PRFCODE is ' + oListItem.get_item('GenPRFID'));
        oListItem.set_item('PO',prfcode);
        oListItem.update();
        alert("Updated PRF CODE SuccessFully");
    }

}

Answer 1

You can follow below steps for updating

oListItem.set_item('Title', 'My Updated Title');
oListItem.update();
clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));