<apex:inputField> can only be used with SObjects, or objects that are Visualforce field component resolvable

Question

I have a VF page that has pageblock table on it which displays data from a list. I am trying to add a field from that list as a input field but I get the below error for the quantity field. How can I use a field from a list of non sObject as input field ?

<apex:inputField> can only be used with SObjects, or objects that are Visualforce field component resolvable.

Code : Controller

public class TestController_NWL{
public class OrderProduct{
    public String materialNumber {get; set;}
    public Integer quantity {get; set;}
}
Public List<OrderProduct> orderProductsList {get; set;}
}

VF Page :

<apex:page controller="TestController_NWL">
<apex:pageBlockSection title="Products" columns="1">
    <apex:pageBlockTable value="{!orderProductsList}" var="op" title="Products">
        <apex:column headerValue="Material Number">
            <apex:outputLink onclick="alert('Success');">
                {!HTMLENCODE(op.materialNumber)}
            </apex:outputLink>
        </apex:column>
        <apex:column headerValue="Material Number">
            <apex:inputField value="{!op.quantity}" />
        </apex:column>                  
    </apex:pageBlockTable>
</apex:pageBlockSection>

Answer 1

If it's not an sObject field, you have to use one of the typed input tags. In your case, you would use <apex:inputText>.

Additional options include <apex:inputcheckbox and <apex:inputTextArea> to handle other data types.