For example, after clicking on Hide button some items disappear

function hideItem() {
            targList = document.getElementsByClassName("completed");
            document.getElementsByClassName("completed")
            if (targList) {
                for (var x = 0; x < targList.length; x  ) {
                    targList[x].setAttribute('style', 'display: none !important');
                }
            }
            localStorage.setItem("autosave", targList);
        }

But after refreshing the page style of items do not save. How to preserve this style of element after reloading web page?

CodePudding user response：

You can't store DOM into localStorage. You'd have to save identifying code for each element. For example, id.

Then do the opposite after loading the page.

function hideItem() {
  var targList = document.getElementsByClassName("completed");
  var hidden_ids = []
  for (var x = 0; x < targList.length; x  ) {
    targList[x].setAttribute('style', 'display: none !important');
    hidden_ids.push(targList[x].id)
  }
  localStorage.setItem("autosave", JSON.stringify(hidden_ids));
}

function loadItem() {
  var hidden_ids = Json.parse(localStorage.getItem("autosave") || '[]');
  for (var x = 0; x < hidden_ids.length; x  ) {
    document.getElementById(hidden_ids[x]).setAttribute('style', 'display: none !important');
  }
}
hideItem();

<div id="elem1" >hello</div>
<div id="elem2" >hello</div>