Form behaving differently in different browsers

Hi Team I have a On Form Populated event to disable a drop down list and date field. Conditions
  • Drop Down Menu should be disabled after user input
  • Date should be disabled on create itself
I have the below code getFieldByName("approval_date").getElementsByTagName("input")[0].setAttribute("disabled", ""); getFieldByName("approval_date")getElementsByTagName("input")[1].setAttribute("disabled", ""); getFieldByName("approval_date").getElementsByTagName("input")[1].src = "../images/calendar-disabled.svg"; var varMyddl = getFieldByName('input_type'); if(varMyddl) { setTimeout(function(){ varMyddl.getElementsByTagName("input")[0].disabled = true; varMyddl.getElementsByTagName("button")[0].disabled = true; }, 1);} In Chrome Browser On Create, Date and input_type is also disabled On Save : Not able to save as both are mandatory fields In IE Browser On Create, Date and input_type is not disabled On Save : Both are disabled Am I missing something ?    
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