actionStatus tag in visualforce

<apex:actionStatus> tag

actionStatus

This tag helps you to display the status AJAX request like an AJAX request can either be in progress.

See the below example to understand <apex:actionstatus> tag.

Below visualforce helps you to search opportunity based on name:

<apex:page controller="OppsearchController">
<apex:form >
<apex:pageBlock id="pb" mode="edit">
<apex:pageBlockSection >
<apex:pageBlockSectionItem >
<apex:outputLabel for="Search String">Search String</apex:outputLabel>
<apex:panelGroup >
<apex:inputText value="{!searchString}"/>
<apex:commandButton value="GO" action="{!oppResult}" status="as" reRender="pbt"/>
<apex:actionStatus startText="Searching......." id="as"></apex:actionStatus>
</apex:panelGroup>
</apex:pageBlockSectionItem>
</apex:pageBlockSection>
<apex:pageBlockSection title="Result">
<apex:pageBlockTable value="{!OppSearchResult}" var="opp" id="pbt">
<apex:column value="{!opp.name}"/>
</apex:pageBlockTable>
</apex:pageBlockSection>
</apex:pageBlock>
</apex:form>
</apex:page>

Apex Controller:

public class OppsearchController {

	List<Opportunity> OppSearchResult;
	public String searchString { get; set; }
	
	public List<Opportunity> getOppSearchResult() {
		return OppSearchResult;
	}

	public PageReference oppResult() {
		OppSearchResult = (List<Opportunity>)[FIND :searchString RETURNING Opportunity(Name)][0];
		return null;
	}
}

See the below visualforce page output.

In the above screen, when you click on Go button, it will get the record and will status as you defined in actionstatus tag.