How to add alert message if record is already present in the object?

Heelo,

I want functionality where if already records are present in the object then it should through error message that record are already created and does not create any record. I am writing this code on custom button. And on click of custom button reords get created. My code is as below

Controller:

public with sharing class Calender {
public List<DTP__c> mydtpList{get;set;}
public MTP__c obj{get;set;}
private ApexPages.StandardController controller;
public Calender(ApexPages.StandardController controller)
{

this.controller = controller;
tid = ApexPages.currentPage().getParameters().get('id');
System.debug('***************dtp added*******************'+tid);
}
public PageReference saveAndReturn()
{
PageReference cancel = controller.cancel();
controller.save();
return cancel;
}

public Decimal dy;
public date myDate;

public id tid{get;set;}

public PageReference createdtp() {

System.debug('***************tid tid*******************'+tid);
obj = [Select Id, Month__c, Year__c, February__c, NumberOfDays__c from MTP__c where id=:tid ];

dy= obj.NumberOfDays__c;

if(obj.February__c !=null)
{
String str=obj.February__c;
dy=Decimal.ValueOf(str);
}
else
{
Decimal str= obj.NumberOfDays__c;
dy=str;
}


List<DTP__c> newdtp= new List<DTP__c>();
System.debug('***************dy size******************'+dy);
for(Integer i = 1; i<=dy; i++)

{
DTP__c dt = new DTP__c();
dt.MTP__c=tid;
/* myDate = date.newInstance(obj.Year__c, obj.Month__c, 1);
Integer day = myDate.dayOfYear();
system.assertEquals(294, day); */
/* myDate = date.newInstance(integer.valueOf(obj.Year__c), integer.valueOf(obj.Month__c), 1);
Integer day = myDate.dayOfYear();
system.assertEquals(294, day);*/
newdtp.add(dt);
System.debug('****************dtp added********************'+tid);



}
insert newdtp;
return null;
}

}

VF PAge:



<apex:page standardController="MTP__c" extensions="Calender" action="{!createdtp}">
<apex:form >
<html>
<style type="text/css">

.myButton {
-moz-box-shadow: 3px -3px 5px -2px #899599;
-webkit-box-shadow: 3px -3px 5px -2px #899599;
box-shadow: 3px -3px 5px -2px #899599;
background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #ededed), color-stop(1, #bab1ba));
background:-moz-linear-gradient(top, #ededed 5%, #bab1ba 100%);
background:-webkit-linear-gradient(top, #ededed 5%, #bab1ba 100%);
background:-o-linear-gradient(top, #ededed 5%, #bab1ba 100%);
background:-ms-linear-gradient(top, #ededed 5%, #bab1ba 100%);
background:linear-gradient(to bottom, #ededed 5%, #bab1ba 100%);
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#ededed', endColorstr='#bab1ba',GradientType=0);
background-color:#ededed !Important;
-moz-border-radius:24px !Important;
-webkit-border-radius:24px !Important;
border-radius:24px !Important;
border:2px solid #d6bcd6 !Important;
display:inline-block !Important;
cursor:pointer !Important;
color:#3a8a9e !Important;
font-family:Arial !Important;
font-size:18px !Important;
font-weight:bold !Important;
padding:2px 36px !Important;
text-decoration:none !Important;
text-shadow:0px 0px 0px #e1e2ed !Important;
margin: 10px 10px 10px 10px !Important;

}
.myButton:hover {
background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #bab1ba), color-stop(1, #ededed));
background:-moz-linear-gradient(top, #bab1ba 5%, #ededed 100%);
background:-webkit-linear-gradient(top, #bab1ba 5%, #ededed 100%);
background:-o-linear-gradient(top, #bab1ba 5%, #ededed 100%);
background:-ms-linear-gradient(top, #bab1ba 5%, #ededed 100%);
background:linear-gradient(to bottom, #bab1ba 5%, #ededed 100%);
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#bab1ba', endColorstr='#ededed',GradientType=0);
background-color:#bab1ba;
}
.myButton:active {
position:relative;
top:1px;
}
</style>
<center>
<h1 style="font-size: 300%;"> Records Created Successfully </h1>
<br />
<br />
<br />

<apex:commandButton styleClass="myButton" action="{!cancel}" value="Close"/>

</center>
</html>
</apex:form>
</apex:page>

September 21, 2016
·
Answer
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Nagendra (Salesforce Developers)
Hi Satakshi,

Please check the below thread from the stack overflow community which might help you to accelerate with the above requirement.
http://stackoverflow.com/questions/11595574/display-alert-box-through-the-trigger-salesforce
Kindly mark this post as solved if the information help's so that it gets removed from the unanswered queue and becomes a proper solution which results in helping others who are really in need of it.

Best Regards,
Nagendra.P

October 14, 2016
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