Menu dispaly on screen

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Javascript

var veg = document.getElementById('veg').checked;
	 var nonveg = document.getElementById('nonveg').checked;
	 var drinks = document.getElementById('drinks').checked;	
	if(veg==false && nonveg==false && drinks==false)
	{
		alert("Please select Menu Section");
		return false;
	}
	else
	{
		if(veg==true)
		{
			var vegcheck = document.getElementsByName('vegdish');
			var vegitemcheck = false;
			for (var i=0; i<vegcheck.length;i++) 
			{
				if (vegdish[i].checked==true) 
				{
					vegitemcheck = true
				}
			}
			if(vegitemcheck==false)
			{
				return false;
			}
		}
	}

What I have tried:

i tried the above code but found an error like Rock & Roll.html:124 Uncaught TypeError: document.getElementById(...).getElementsByName is not a function
at orderList (Rock & Roll.html:124)
at HTMLInputElement.onclick (Rock & Roll.html:78