Hey everyone. I have a form that has a plus button and a minus button on each side. I want the form to go up by three when clicked. Right now it goes up and down by one using the ++ operator. How can i get it to change to an value I need? Thanks, the code is below...

 

<script type="text/javascript">
function trim(str) {
 return str.replace(/^\s+|\s+$/g, '');
}


function isEmpty(str) {
 str = trim(str);
 return ((str == null) || (str.length == 0))
}


function isDigit(c) {
 return ((c >= "0") && (c <= "9"))
}


function isInteger(str) { 
 var i;
 for (i = 0; i < str.length; i++) {
 var c = str.charAt(i);
 if (!isDigit(c)) return false;
 }
 return true;
}


function monthModify(txtElement, btnElement) {

 switch(btnElement.name) {
case 'increase':
 	if(isEmpty(txtElement.value)) {
   	txtElement.value = '1';
 	} else if(isInteger(txtElement.value)){
   	txtElement.value ++;
 	} else {
   	alert('The value you are trying to increment is not an integer');
   	txtElement.value = '';
 	}
break;

case 'decrease':
 	if(isEmpty(txtElement.value)) {
   	txtElement.value = '0';
 	} else if(isInteger(txtElement.value)){
   	if(txtElement.value > 0) {
     	txtElement.value --;
   	} else {
     	alert('The minimum value is zero for this field');
   	}
 	} else {
   	alert('The value you are trying to decrement is not an integer');
   	txtElement.value = '';
 	}
break;

default:
 }
}

function initForm(oForm, element_name, init_txt) {
 frmElement = oForm.elements[element_name];
 frmElement.value = init_txt;
}

function showFormData(oForm) {
 var msg = "The data that you entered for the form : \n";

 for (i = 0; i < oForm.length, oForm.elements[i].getAttribute("type") !== 'button'; i++) {
msg += oForm.elements[i].tagName + " with 'name' attribute='" + oForm.elements[i].name + "' and data: ";
if(oForm.elements[i].value == null || oForm.elements[i].value == '') {
msg += "NOT SET \n";
} else {
 	msg += oForm.elements[i].value + "\n";
}
 }

 alert(msg);
}


function clearFieldFirstTime(element) {
 if (element.counter==undefined) {
 element.counter = 1;
 }

 else {
 element.counter++;
 }

 if (element.counter == 1) {
 element.value = '';
 }
}
</script>

Edited January 1, 201115 yr by Boyles Web Design

Nevermind I got it to work with...

 

switch(btnElement.name) {
       case 'increase':
       if(isEmpty(txtElement.value)) {
       txtElement.value = '1';
       } else if(isInteger(txtElement.value)){
       txtElement.value -= -35;
       } else {
       alert('The value you are trying to increment is not an integer');
       txtElement.value = '';
       }
       break;

 

Where 35 is my incrament

Edited January 1, 201115 yr by Boyles Web Design