问题描述
顶点类:
public class OppBasedOnStages {
public Opportunity opp {get;set;}
public List<Opportunity> opportunities {get;set;}
public OppBasedonStages(ApexPages.StandardController controller)
{
}
public OppBasedOnStages() {
opp = new Opportunity();
opportunities = new List<Opportunity>();
}
public void showOpp() {
if(opp.Id == null){
if(opp.StageName == 'Prospecting'){
opportunities = [SELECT Id,Name,StageName,Amount FROM Opportunity WHERE StageName='Prospecting'];
}
else if(opp.StageName == 'Qualification'){
opportunities = [SELECT Id,Amount FROM Opportunity WHERE StageName='Qualification'];
}
else if(opp.StageName == 'Need Analysis'){
opportunities = [SELECT Id,Amount FROM Opportunity WHERE StageName='Need Analysis'];
}
else if(opp.StageName == 'Need Analysis'){
opportunities = [SELECT Id,Amount FROM Opportunity WHERE StageName='Need Analysis'];
}
else if(opp.StageName == 'Negotiation/Review'){
opportunities = [SELECT Id,Amount FROM Opportunity WHERE StageName='Negotiation/Review'];
}
else if(opp.StageName == 'Perception Analysis'){
opportunities = [SELECT Id,Amount FROM Opportunity WHERE StageName='Perception Analysis'];
}
else
{
ApexPages.Message Myerrormsg = new ApexPages.Message(ApexPages.Severity.INFO,' No opportunities exist with this stagename.' + Opp.StageName);
ApexPages.addMessage(Myerrormsg);
}
}
}
}
Visualforce页面:
<apex:page StandardController = "Opportunity" extensions = "OppBasedonStages" >
<apex:form >
<apex:pageBlock >
<apex:pageBlockSection >
<apex:inputField value="{!opp.StageName}" >
<apex:commandButton value="Display" Action="{!showOpp}"/>
<apex:actionSupport event="onchange" action="{!showOpp}" reRender="Display"/>
</apex:inputField>
</apex:pageBlockSection>
<apex:pageBlockTable value="{!opportunities}" var="a">
<apex:column value="{!a.Name}" />
<apex:column value="{!a.StageName}" />
<apex:column value="{!a.Amount}"/>
</apex:pageBlockTable>
</apex:pageBlock>
</apex:form>
</apex:page>
我遇到了运行时错误,因此我想清除它。是该平台的新手。请帮助我清除此错误。谢谢。 错误:尝试取消引用空对象 页面oppbasedonstagesvf中的表达式'{!showOpp}'中存在错误:Class.OppBasedOnStages.showOpp:第16行,第1列
解决方法
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