VisualForce Page to Create the Trigger Dynamically.

Page:

<apex:page controller="TriggerCreator" sidebar="false" tabStyle="TriggerCreator__tab">

  <div style="float:right" >

      <apex:image value="{!$Resource.TriggerCreatorLogo}" />

    </div>

    <div >

  <apex:form id="fm" >

  <apex:pageBlock id="pg" > 

  <h1>Enter Trigger Details </h1><br/><br/>  

         <apex:panelGrid columns="2" > 

             <apex:outputLabel styleClass="outputLabel" value="Trigger Name:"/>    

             <apex:inputText styleClass="inputText" value="{!TrName}"/>

             <apex:outputLabel styleClass="outputLabel" value="Object Name:" />    

        <!--     <apex:inputText styleClass="inputText" value="{!ObjName}" id="ObjName"/>  -->

                      <apex:actionRegion >      

                           <apex:selectList value="{!selectedObject}" size="1">

                                    <apex:selectOptions value="{!ObjectNames}"/>

                            </apex:selectList>

                     </apex:actionRegion>                         

                  

             <apex:outputLabel styleClass="outputLabel" value="Trigger Event:"/> 

             <apex:selectList value="{!type}" multiselect="true"  >

                <apex:selectOption itemValue="Before Insert" itemLabel="Before Insert"/>

                <apex:selectOption itemValue="After Insert" itemLabel="After Insert"/>

                <apex:selectOption itemValue="Before Update" itemLabel="Before Update"/>

                <apex:selectOption itemValue="After Update" itemLabel="After Update"/>

                <apex:selectOption itemValue="Before delete" itemLabel="Before delete"/>

                <apex:selectOption itemValue="After delete" itemLabel="After delete"/>

                <apex:selectOption itemValue="after Undelete" itemLabel="After Undelete"/>

            </apex:selectList>

         </apex:panelGrid>

             <div style="padding-left:105px;" >

             <apex:commandButton style="background:black;width:150px;height:40px;color:white;font-size:12pt;" action="{!TriggerCreator}"  oncomplete="Showoptions('{!str}','{!type}','{!TrName}');fun('{!str}','{!tid}','{!type}','{!TrName}');"  value="Create Trigger" status="actStatusId" rerender="fm"/>  

              <apex:actionStatus id="actStatusId" >

                <apex:facet name="start" >

                  <img src="{!$Resource.Searching}" />                    

                </apex:facet>

            </apex:actionStatus>

           </div>

         <apex:pageMessages ></apex:pageMessages>

      </apex:pageBlock>

   <p id="options" ></p>

   <p id="refresh" ></p>

  </apex:form>

  </div>  

   <script type="text/javascript">

        function Showoptions(str,tp,tnam){    

            if(!str.includes('Invalid')&&!str.includes('DUPLICATE')&&!str.includes('UNKNOWN')&&tp!='[]'&&tnam!=''&&/^[a-zA-Z0-9- ]*$/.test(tnam)){

        <!--    document.getElementById("options").innerHTML='<h2>To edit the Trigger </h2><a style="text-decoration: none;" href="javascript:fun(dd);"><h3>clickhere</h3></a>';    -->

            document.getElementById("refresh").innerHTML='<h2>To Create New Trigger </h2><a style="text-decoration: none;" href="javascript:refresh();"><h3>clickhere</h3></a>';

            

        }

       } 

   </script> 

  <script>

    function refresh() {

       window.location.reload();

    }

</script>

 <script>

    function fun(st,eid,tp,tnam){

        if(!st.includes('Invalid')&&!st.includes('DUPLICATE')&&!st.includes('UNKNOWN')&&tp!='[]'&&tnam!=''&&/^[a-zA-Z0-9- ]*$/.test(tnam)){  

         if(confirm("Press OK to Edit the Created Trigger")) 

             window.open("/"+eid+"/e?retURL=%2Fsetup%2Fbuild%2FviewApexTrigger.apexp%3Fid%3D"+eid+"%26id%3D"+eid);     

        } 

    }

</script>

  <style>

      h1  {

    color:#04cef7;

    width:150px;

    clear:left;

    font-size:15pt;

    

   }

   .outputLabel{

    width:100px;

    clear:left;

    text-align:right;

    font-weight:bold;

    

    }

    .inputText, .outputLabel{

        float:left;

    }

      h2 {

    font-weight:bold;

    font-size:20px;

    color:#04cef7;

    clear: left;

    text-align:center;

    width:500px;

   }

   a,h3{color:#0655d3;

       font-weight:bold;

    font-size:18px;

    text-decoration: none;}

  </style>    

</apex:page>

Controller:

public class TriggerCreator {

    public String type { get; set; }

    public String ObjName { get; set; }

    public String TrName  { get; set; }

    Public String str {get;set;}

    public string tid {get;set;}

    

    public Map <String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();

    public String selectedObject {get; set;}

    public String selectedField {get; set;}

    Public void TriggerCreator(){

    map<string,string> mapinfo= new map<string,string>();

    system.debug('++++++++++++++++++'+type);

  //  string patte = '/^[a-zA-Z0-9_]+$/';

    if(TrName=='' ||!Pattern.matches('[a-zA-Z0-9_]+',TrName)){ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Please Enter Valid TriggerName.'));}

    else if(selectedObject ==''){ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Please Enter ObjectName.'));}

    else if(type=='[]'){ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Please select Event.'));}

    else{

    mapinfo.put('Name',TrName);

    mapinfo.put('TableEnumOrId',selectedObject);

    string type1=type.remove('[');

    string type2=type1.remove(']');

    mapinfo.put('Body','trigger '+ TrName + ' on '+ selectedObject +' ('+type2+'){ }');

    String serialized = JSON.serialize(mapinfo);

         

    Httprequest req = new HttpRequest();

    req.setEndpoint('https://ghattamaneni-chaithanya-dev-ed.my.salesforce.com/services/data/v27.0/sobjects/ApexTrigger'); // Enter the org.

    req.setMethod('POST');

    req.setHeader('Content-Type','application/json');

    req.setHeader('Authorization','Bearer '+UserInfo.getSessionID());

    req.setBody(serialized);

    Http httpReq = new Http();

    HttpResponse res = httpReq.send(req);

    System.debug('>>>>>>>>'+res.getBody());

    str=string.valueof(res.getBody());

    system.debug('-----------'+str);

    if(str.contains('true')){ApexPages.addMessage(new ApexPages.Message(ApexPages.severity.CONFIRM, 'Trigger Created Successfully!'));

        string rstr=str.remove('"');

        string[] strs=rstr.split(':');

        string[] fstr=strs[1].split(',');

        tid=fstr[0];

        system.debug('.................'+tid);

    }

    else if(str.contains('INVALID')){ApexPages.addMessage(new ApexPages.Message(ApexPages.severity.ERROR, 'Error Occured Please Check The Trigger Name OR Object Name and Try again'));}

    else if(str.contains('DUPLICATE')){ApexPages.addMessage(new ApexPages.Message(ApexPages.severity.ERROR, 'Trigger with this name is already Exist Please Enter different Name'));}

    else if(str.contains('UNKNOWN')){ApexPages.addMessage(new ApexPages.Message(ApexPages.severity.ERROR, 'Error Occured Please Check Trigger Name and Try again'));}

    }

   }

     public List<SelectOption> getObjectNames() 

    {

        List<SelectOption> objNames = new List<SelectOption>();

        List<String> entities = new List<String>(schemaMap.keySet());

        entities.sort();

         ////////////////////////////////

         Schema.DescribeSobjectResult[] results = Schema.describeSObjects(entities );

        for (DescribeSObjectResult result : results){

            if(result.isUndeletable())

            objNames.add(new SelectOption(result.getName(),result.getName()));

            }

      /*  for(String name : entities)

        {

            if(isundeletable())

            objNames.add(new SelectOption(name,name));

        }*/

        return objNames;

     }

}