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Reset values

I have lookup columns in the newform in SharePoint 2010.  I have a reset button on the form, which refreshes the fields using Form action.  All the other fields value is cleared on the form  except for the lookup columns. how to clear the lookup values on the newform? Please help.
1 Solution
Try this script:
function resettaform() {
	var myControlI = document.getElementsByTagName("input");
	var myControlS = document.getElementsByTagName("select");
	var myControlT = document.getElementsByTagName("textarea");
	for (var i=0; i<myControlI.length; i++) {
		if (myControlI[i].getAttribute("type") == "checkbox" ||
		myControlI[i].getAttribute("type") == "radio") {
			if (myControlI[i].getAttribute("name") == "Assistenza_scelta") {
			} else {
		} else {
	for (var j=0; j<myControlS.length; j++) {
		myControlS[j].options[0].selected = true;
	for (var k=0; k<myControlT.length; k++) {
		myControlT[k].value= "";


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