set summary field value

[t]

How can i set the summary field, to a specific value? Basically i have set them all to a default and now i want to change it to match two custom fields joined together..

Here is the code i am using but with no luck:(

<!-- @@Formula: if (issue.get("customfield_10001") == null
	return "Product Master";
	else
	return ("Masters" + issue.get("customfield_10001") + " " + issue.get("customfield_10281"))
	-->

i have also tried this:

<script type="text/javascript">
  
var summaryField=AJS.$("#summary").parent();
 AJS.$("#summary").val("Masters" + issue.get("customfield_10001") + " " + issue.get("customfield_10281"));
summaryField.hide();
  
</script>

[Vasiliy Zverev]

I do not know well javascript, but if you need to update issue you need to call IssueManager.updateIssue() method (https://docs.atlassian.com/jira/latest/com/atlassian/jira/issue/IssueManager.html).

Here is version for JAVA API:

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.event.type.EventDispatchOption

issue.setSummary( issue.getSummary() + "They killed Han Solo, bustards!" );
issueManager.updateIssue(ComponentAccessor.jiraAuthenticationContext.getUser().directoryUser, issue, EventDispatchOption.ISSUE_UPDATED, false);

[t]

Anyone able to assist?