How to change display text of a lookup field in Dynamics CRM 2011/13/15 using JavaScript

Javascript :

Pass Lookup Field as Parameter (I had passed \”new_orderno\” as fieldname parameter)

//Change Lookup Display Text

function ChangeLookUpDisplayValue(fieldname)
{
var lookupData = new Array();
var lookupItem= new Object(); 
var lookup = Xrm.Page.data.entity.attributes.get(fieldname);

if(lookup!=null)
{
var displayvalue=\’\’;
var xmlText=\’\’;

xmlText+=\”\”;xmlText+=\”\”;
xmlText+=\”\”;
xmlText+=\”salesorder\”;
xmlText+=\”\”+lookup.getValue()[0].id+\”\”;
xmlText+=\”\”;
xmlText+=\”false\”;
xmlText+=\”\”;
xmlText+=\”ordernumber\”;
xmlText+=\”\”;
xmlText+=\”\”;
xmlText+=\”\”;
xmlText+=\”\”;
xmlText+=\”\”;
var xHReq = new XMLHttpRequest();


var url=Xrm.Page.context.getClientUrl()+\”/XRMServices/2011/Organization.svc/web\”;
xHReq.open(\”POST\”,url,false);
xHReq.setRequestHeader(\”SOAPAction\”,\”http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Retrieve\”);
xHReq.setRequestHeader(\”Content-Type\”, \”text/xml; charset=utf-8\”);
xHReq.setRequestHeader(\”Accept\”,\”application/xml,text/xml,*/*\”);
xHReq.send(xmlText);

//Capture the result. 
var resultXml = xHReq.responseXML; 
var varray = new Array();

//Check for errors. 
var errorCount = resultXml.selectNodes(\’//s:Fault\’).length;
if(errorCount != 0) 
{
var msg = resultXml.selectSingleNode(\’//faultstring\’).nodeTypedValue;
alert(msg); 
}
else
{ 
var result = resultXml.getElementsByTagName(\”a:KeyValuePairOfstringanyType\”);
if(result.length>0) 
{
displayvalue= result[0].childNodes[1].lastChild.text;
}
if(displayvalue!=\’\’)       
{ 
lookupItem.name = displayvalue;
lookupData[0] = lookupItem;
lookup.DataValue = lookupData;
Xrm.Page.getAttribute(\”new_orderno\”).setValue([{id:lookup.getValue()[0].id,name:displayvalue,entityType:\”salesorder\”}]);
}
}
}
}

After Putting Above Javascript Lookup display text will look like below :

Hope this post will help someone who want to change Display Text of Lookup field.