Set any default View to LookUp field on Form Onload in ms crm

By View Uid

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function formOnLoad(){

Xrm.Page.getControl("Lookup field name").setDefaultView("{view guid}");

}

By View Name

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function formOnLoad() {

    setLookupViewByName("Lookup field name", "view name", true);

}

function setLookupViewByName(fieldName, viewName, asynchronous) {

    var req = new XMLHttpRequest();

    req.open("GET", Xrm.Page.context.getClientUrl() + "/api/data/v8.2/savedqueries?$select=savedqueryid&$filter=name eq '" + viewName + "'", asynchronous);

    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.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");

    req.onreadystatechange = function () {

        if (this.readyState === 4) {

            req.onreadystatechange = null;

            if (this.status === 200) {

                var results = JSON.parse(this.response);

                if (results.value.length > 0) {

                    var savedqueryid = results.value[0]["savedqueryid"];

                    Xrm.Page.getControl(fieldName).setDefaultView(savedqueryid);

                } else {

                    Xrm.Utility.alertDialog(viewName + " view is not available.");

                }

            } else {

                Xrm.Utility.alertDialog(this.statusText);

            }

        }

    };

    req.send();

}