Comment Drafts (ScriptRunner for JIRA)

.Comment Draft README.

Create a Script Fragment that calls the above JS code with the context "jira.view.issue".

comment-draft.js

(function ($) {
  
  if(localStorageSupported()){
  
    var contentKey;
    var expirationMomentKey;
    var secondsBetweenSaves = 10;
      
    $(function () {
      
      JIRA.bind(JIRA.Events.NEW_CONTENT_ADDED, function (event, $context, reason) {
        if (reason === JIRA.CONTENT_ADDED_REASON.pageLoad || reason === JIRA.CONTENT_ADDED_REASON.panelRefreshed) {
          restoreCommentDraft();
        }
      });
      
      // On every change, check if the saved draft is old. If it is, save the new comment draft.
      $("textarea#comment").bind('input propertychange', saveIfDraftIsOld);
      // After we click the Send button, we don't want this draft anymore.
      $("input#issue-comment-add-submit").on("click", deleteDraft);
      // Save the draft when we close the window
      window.addEventListener("beforeunload", saveCommentDraft); 
      
      restoreCommentDraft();
    });
    
    function updateKeys(){
      issueKey = JIRA.Issue.getIssueKey();
      contentKey = "comment.draft.content." + issueKey;
      expirationMomentKey = "comment.draft.expires-on." + issueKey;
    }
    
    function restoreCommentDraft() {
      updateKeys();
      var restoredComment = localStorage.getItem(contentKey);
      if(restoredComment){
        $("textarea#comment").val(restoredComment);
      }
    }
    
    function saveCommentDraft() {
      var commentContent = $("textarea#comment").val();
      if(commentContent){
        localStorage.setItem(contentKey, commentContent);
        var now = new Date();
        var expirationMoment = now.getTime() + secondsBetweenSaves * 1000;
        localStorage.setItem(expirationMomentKey, expirationMoment);
      }
    }
    
    function deleteDraft() {
      localStorage.removeItem(contentKey);
      localStorage.removeItem(expirationMomentKey);
    }
    
    function saveIfDraftIsOld() {
      var expirationMoment = localStorage.getItem(expirationMomentKey);
      var currentMoment = new Date();
      if (currentMoment >= expirationMoment){
        saveCommentDraft();
      }
    }
    
  }
    
  function localStorageSupported() {
    return typeof(Storage) !== "undefined";
  }
    
})(AJS.$);