Error in Delete function inside a vf page

Question

I have two required fields inside a Visualforce Page: prodottoservizio, quant. Inside the page I can build a list of objects shown inside a table. Now I want to insert a Delete Button that deletes all the object records created inside the controller extension and return to the previous URL.

Here my VF code:

 <apex:PageBlock id="contratto">
    <apex:pageBlockButtons location="bottom">
        <apex:commandButton action="{!createContr}" value="Scegli i Prodotti" reRender="panprodotti" />
        <apex:commandButton action="{!deleteContract}" value="Elimina Contratto e prodotti selezionati" onclick="window.history.back()" />
    </apex:pageBlockButtons>
    <apex:pageBlockSection title="Specifiche Contratto">
        <apex:input required="true" label="Data inizio contratto" value="{!cData}" type="date" id="datainiziocontr" />
        <apex:input required="true" label="Durata contratto(mesi)" value="{!cDurata}" type="number" id="durcontr" />
        <apex:input label="Condizioni speciali" value="{!cCondizioni}" type="text" id="condizioni" />
    </apex:pageBlockSection>
    </apex:PageBlock>
    apex:outputPanel id="panprodotti">
        <apex:pageBlock rendered="{!cData<>null}">
            <apex:pageBlock id="pselected">
                <apex:pageBlockSection title="Inserisci i Prodotti" collapsible="false" >
                    <apex:inputField required="true" id="prodottoservizio" value="{!prodotto.Scelta__c}"/>
                    <apex:inputField id="gionol" value="{!prodotto.Giorni_durata_noleggio__c}"/>
                    <apex:inputField required="true" id="quant" value="{!prodotto.Quantit_prodotto__c}"/>
                    <apex:inputField id="sconto" value="{!prodotto.Sconto__c}"/>
                </apex:pageBlockSection>
            </apex:pageBlock>
            <apex:pageBlock >
                <apex:pageBlockButtons location="top">
                    <apex:commandButton action="{!addFromShoppingCart}" value="Aggiungi al Contratto" reRender="pinserted,panprodotti" />
                </apex:pageBlockButtons>
            </apex:pageBlock>

and this is my function:

public void deleteContract(){
    delete shoppingCart;
    delete nuovocontratto;
}

When I click the button I have an error because that two fields are required. How How can I solve this Problem?

P.S. I posted a code's portion because the controller is huge.

Answer 1

You can bypass page-side validations by setting the immediate="true" property on a commandButton tag. In the case of a delete operation, it seems like that may be the appropriate course of action.

Here is the description of the immediate attribute in the documentation:

A Boolean value that specifies whether the action associated with this component should happen immediately, without processing any validation rules associated with the fields on the page. If set to true, the action happens immediately and validation rules are skipped. If not specified, this value defaults to false.