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emuelasemuelas 

Render if controller does not return any records

I have a simple standard list controller :

<apex:page standardController="Order_Line__c" sidebar="True"   showHeader="True"recordSetVar="orderlines">
<apex:form >

<apex:pageBlock >
<apex:pageMessages />
<apex:pageBlockSection title="Inventory details for selected Products">
<apex:pageBlockTable value="{!selected}" var="j" border="1">
<apex:column value="{!j.prod__c}" />
<apex:column value="{!j.Product__r.Available__c}"/>
<apex:column value="{!j.Product__r.Back_Order_Quantity__c}"/>
<</apex:pageBlockTable>
</apex:pageblockSection>
<apex:pageBlockButtons location="bottom">

<apex:commandButton value="Back" action="{!cancel}"/>
</apex:pageBlockButtons>
</apex:pageBlock>
</apex:form>

</apex:page>


It works fine ,But when there are no records passed to the controller i want it to display a message and render the page.

I tried modifying the code for this as below with the highlighted changes.
But now even if records are returned from the controller, it just displays the output message"Please select a  order line".

Please help me.


The modified controller:

<apex:page standardController="Order_Line__c" sidebar="True"   showHeader="True"
recordSetVar="orderlines">
<style>

.FontSize {
font-size:20px;
}
</style>
<apex:outputText value="Please select a  order line" rendered="{!LEN(Order_Line__c.Id)==0}"/>

<apex:form rendered="{!LEN(Order_Line__c.Id)>0}">

<apex:pageBlock >
<apex:pageMessages />
<apex:pageBlockSection title="Inventory details for selected Products">
<apex:pageBlockTable value="{!selected}" var="j" border="1">
<tr>
<td><apex:column value="{!j.prod__c}" style="white-space:nowrap ;font-weight:bold"/></td>
</tr>
<apex:column />
<apex:column value="{!j.Product__r.Available__c}"/>
<apex:column />
<apex:column value="{!j.Product__r.Back_Order_Quantity__c}"/>
<apex:column />
<apex:column value="{!j.Product__r.Reserve__c}"/>
<apex:column />
<apex:column value="{!j.Product__r.On_Hand_Quantity__c}"/>
<apex:column />


</apex:pageBlockTable>
</apex:pageblockSection>
<apex:pageBlockButtons location="bottom">

<apex:commandButton value="Back" action="{!cancel}"/>
</apex:pageBlockButtons>
</apex:pageBlock>
</apex:form>

</apex:page>

 


 

ministe2003ministe2003

Personally, I would go with rendered="{!Order_Line__c == null}"/> instead of using LEN and use != for the other condition
emuelasemuelas

Nope,this is not working...
SteveBowerSteveBower

how about:

 

rendered="{!ResultSize != 0)"

 

The StandardSetController class has a 'getResultSize()' method that return the number of records in the set.  Best, Steve.
emuelasemuelas

Hi Steve,

 

I modified this to:

 

<apex:form rendered="{!ResultSize!= 0}">

How do i display an error message if no records are returned?
ministe2003ministe2003

Why dont you have a pagemessage that contains your error that is only rendered if ResultSize== 0?

 

If you want something that looks like a standard caught exception, use:

 

 

<apex:pagemessage strength="2" severity="warning" summary="this is my error message" rendered="{!ResultSize== 0}"/>

 

 

Check out the docs for descriptions of the strength and severity fields
SteveBowerSteveBower

Something like:

 

<apex:form rendered="{!ResultSize != 0}">

... stuff...

</apex:form>

 

<apex:outputPanel rendered="{!ResultSize == 0)">

There were no records selected.

</apex:outputPanel>

 

Either way, once you know how to use the rendered property properly, you can essentially build anything you want.

 

Best, Steve.