Hi Phuc,Do you want to display the list of fields based on the type of object selected from the drop down?If yes then, try below:- VF page :-
<apex:page controller="dynamicApex5">
<apex:form id="theForm">
<apex:pageBlock title="Select Object and Fields">
<apex:pageBlockSection title="Select an Object" collapsible="false" columns="2">
<apex:pageBlockSectionItem >
<apex:outputLabel value="Select an object:"></apex:outputLabel>
<apex:selectList value="{!objectName}" size="1" multiselect="false">
<apex:selectOptions value="{!selectedobject}">
</apex:selectOptions>
<apex:actionSupport action="{!function}" event="onchange" reRender="fieldsPanel"/>
</apex:selectList>
</apex:pageBlockSectionItem>
<apex:pageBlockSectionItem >
<apex:outputPanel id="fieldsPanel">
<apex:outputLabel value="Select Fields:"> </apex:outputLabel>
<apex:selectList value="{!fields}" multiselect="true" size="3" >
<apex:selectOptions value="{!lsps}">
</apex:selectOptions>
</apex:selectList>
</apex:outputPanel>
</apex:pageBlockSectionItem>
</apex:pageBlockSection>
</apex:pageBlock>
</apex:form>
</apex:page>
Controller :-
Please refer the below link for reference.https://success.salesforce.com/answers?id=90630000000h1YfAAIHope it will be helpful.Please mark it as best answer if it helps so that it can help other as well.Thank you,Priya Ranjanpublic class dynamicApex5 {
public list<SelectOption> selectedobject { get; set; }
public String objectName { get; set; }
public set<string> flds{get;set;}
Map<String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();
public dynamicApex5(){
selectedobject = new list<SelectOption>();
selectedobject.add(new selectoption('','-None-'));
list<schema.SobjectType> lst=schemaMap.values();
for(schema.SobjectType ss:lst){
selectedobject.add(new selectoption(ss.getDescribe().getLocalName(),ss.getDescribe().getLabel()));
selectedobject.sort();
}
flds= new set<string>();
lsps=new list<SelectOption>();
}
public String fields { get; set; }
public list<SelectOption> lsps{get;set;}
public void function() {
if(objectName!=null || objectName!=''){
Map<string,Schema.SObjectField> mpConField=schemaMap.get(objectName).getDescribe().fields.getMap();
flds=mpConField.keySet();
for(string name:flds){
Schema.DescribeFieldResult fldResult=mpConField.get(name).getDescribe();
lsps.add(new SelectOption(fldResult.getName(),fldResult.getName()));
lsps.sort();
}
}
}
}
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