How to set up a announcement banner for specific project

[Anil]

I want to set up a announcement banner for a specific project.Only the users in that project can see the announcement banner

[Mikael Sandberg]

Hi @Anil,

Welcome to Atlassian Community!

Have a look at this question, you can add the following to the announcement banner and it would be project specific:

<p style="display: none;" id="demo">Sample Announcement</p>
<script>
if (window.location.href.indexOf("projects/SP") != -1) {
document.getElementById("demo").style = "display: block;";
}
</script> 

[Gabriella]

How would you list more than 1 project? here:

("projects/SP")

 I have done , ; : | \ and a space.