disable field and hide/unhide field, section and form

disable field


    crmForm.all.new_link.disabled = false;  //disable the field
    crmForm.all.new_link.disabled = true;   //enable the field

hide/unhide field


    crmForm.all.<fieldname>_c.style.display = "none";
    crmForm.all.<fieldname>_d.style.display = "none";

hide/unhide section

    crmForm.all.<fieldname>.parentElement.parentElement.parentElement.style.display="none";

   another way :


    document.getElementById("tab<tabNo>").childNodes[0].rows[<sectionNo>].style.display = "none";
    // <tabNo> is zero based tab number from left. <sectionNo> is zero based section number from top.

hide/unhide tab


   document.getElementById("tab<tabNo>Tab").style.display = "none";
   // <tabNo> zero based tab number from left