Select lookup field in NewForm.aspx using Querystring

We all knew about lookup column in SharePoint. It is used to get reference from another list. Here, I am going to give an idea to select this lookup column in New form using querystring.

Pass your querystring to Newform.aspx like

http://yourmachinename:portnumber/lists/listname/newform.aspx?itemId=1

Insert a content editor in list's new form. Paste the below script in content editor

<script>

$(document).ready(function ($) {

function SetFormFields() {

    

    var QItemID = GetQueryStringParameter("itemId", "NULL");

    var IDLookup = SPUtility.GetSPFieldByInternalName('yourcolumnname');

    if (QItemID != "NULL") {

        IDLookup.SetValue(QItemID);

    }    

}
});

function GetQueryStringParameter(key, default_) {

    if (default_ == null) default_ = "";

    key = key.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");

    var regex = new RegExp("[\\?&]" + key + "=([^&#]*)");

    var qs = regex.exec(window.location.href);

    if (qs == null)

        return default_;

    else

        return qs[1];

}

</script>