Question about lookup tag in form widget

[Daors]

Hello OFBiz community!

I started to check the execution on how a find form works and saw that in a 
field
there is the lookup tag and has a target:

<field position="2" name="partyIdTo" parameter-name="partyId" 
required-field="true"><lookup target-form-name="LookupPartyName"/></field>

When I check this field in web browser with inspect element there are so many 
attributes like:
        name="partyId"
        size="25" 
        id="0_lookupId_NewSalesInvoice_partyIdTo" 
        data-lookup-ajax-enabled="true" 
        data-lookup-presentation="layer" 
        data-lookup-request-url="LookupPartyName" 
        data-lookup-form-name="NewSalesInvoice" 
        data-lookup-optional-target="" 
        data-lookup-width="640" 
        data-lookup-height="500" 
        data-lookup-position="topleft" 
        data-lookup-modal="true" 
        data-lookup-show-description="true" 
        data-lookup-default-minlength="2" 
        data-lookup-default-delay="300" 
        data-lookup-args="" 
        autocomplete="off"
        data-lookup-ajax= 
url="NewSalesInvoice_partyIdTo,https://localhost:8443/ar/control/LookupPartyName;jsessionid=188FCECFADC720E660C03A5D3462E5F5.jvm1,ajaxLookup=Y&amp;searchValueFieldName=partyId";
 

My question is does lookup target adds these attributes automatically? and if 
so how the process of the ajax call is being made, like where is the jquery 
function that is calling this url, if you could help me explaining this process 
it would mean so much to me.

Thank you so much for your time,
Best regards,
Daors