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Simha YadavSimha Yadav 

how to display loading image when i select object in picklist?

Amit Chaudhary 8Amit Chaudhary 8
On example for your on Button click
<apex:page >
<apex:form >
    <apex:pageBlock id="PB1">
        <apex:pageBlockSection >
            <apex:commandButton status="waitStatus" value="Load Image" reRender="PB1"/>
        </apex:pageBlockSection>
    </apex:pageBlock>
<apex:actionStatus id="waitStatus" style="align:center;">      
            <apex:facet name="start">
                 <apex:image value="/img/loading.gif" title="Processing..."/>
             </apex:facet>
            <apex:facet name="stop"></apex:facet>
</apex:actionStatus>
</apex:form>
</apex:page>



Please reffer below blog :- 
http://amitsalesforce.blogspot.in/2015/02/progress-barloading-image-on_11.html

This will help you

Thanks,
Amit Chaudhary
Amit Chaudhary 8Amit Chaudhary 8
Please try below code:-
<apex:page >
<apex:form >
    <apex:pageBlock id="PB1">
        <apex:pageBlockSection >
            <apex:selectList value="{!abcFilter}" multiselect="false" size="1">
                <apex:selectOption itemValue="A,B,C" itemLabel="All"/>
                <apex:selectOption itemValue="A" itemLabel="A"/>
                <apex:selectOption itemValue="B" itemLabel="B"/>
                <apex:selectOption itemValue="C" itemLabel="C"/>
				<apex:actionSupport event="onchange" status="waitStatus"  reRender="PB1" />

            </apex:selectList> 
		</apex:pageBlockSection>
    </apex:pageBlock>
	
<apex:actionStatus id="waitStatus" style="align:center;">      
            <apex:facet name="start">
                 <apex:image value="/img/loading.gif" title="Processing..."/>
             </apex:facet>
            <apex:facet name="stop"></apex:facet>
</apex:actionStatus>

</apex:form>
</apex:page>

Mark this as solution if this will help you