How to Open the lookup dialog box using Javascript on Dynamics 365 instance

On this Section we will see the How to Open the lookup dialog box using Javascript on Dynamics 365 instance.

Method and Syantx

For this we have to user "lookupObjects" method.
Xrm.Utility.lookupObjects(lookupOptions).then(successCallback, cancelCallback)

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Syntax : Xrm.Utility.lookupObjects(lookupOptions).then(successCallback, cancelCallback)

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Example : Open a lookup dialog box

//Note :- Initialized the XRM boject first

var Xrm = parent.Xrm;

//Step 1- Create a Javascript function

function OpenLookupinJS () {
var lookupObjectParams = {};
lookupObjectParams.entityTypes = ["opportunity"];
lookupObjectParams.defaultEntityType = "opportunity";
lookupObjectParams.defaultViewId = "FD140AAF-4DF4-11DD-BD17-0019B9312238";
lookupObjectParams.allowMultiSelect = false;
Xrm.Utility.lookupObjects(lookupObjectParams).then(AssigneeSuccessCallback, AssigneeCancelCallback)
}

function AssigneeSuccessCallback(selectedItems) {
if (selectedItems != null && selectedItems.length > 0) {
var newAssignee = [{ id: selectedItems[0].id, typename: selectedItems[0].typename, name: selectedItems[0].name }];

//Assign the value to the specific html control
// To display the Lookup value Name on the HTML Text box

$("#TextBoxid").val(newAssignee[0].name);

// ID is required for internal use of the application i.e CRUD

$("#TextBoxid").val(newAssignee[0].id.substring(1, 37););
}
}