javascript - localStorage 和 jQuery 问题

Question

下面的脚本显示表单元素(文本区域)中剩余(允许)的字符。我想使用本地存储来保留在文本区域中输入的文本，直到我提交表单。

我正在尝试使用 localStorage，以便当我返回页面时 - 剩余的字符 (var text_remaining) 不会显示完整的 2000 个字符，而应该只显示剩余的字符...(var text_remaining) ???

<script>

$(document).ready(function() {
var char_th = 2000;
    var text_max = 2000;

    $('#textarea_feedback').html(char_th + ' characters remaining');
    //$('#textarea_feedback').html(text_max + ' characters remaining');

    $('#comments').keyup(function() {
            var text_length = $('#comments').val().length;
            var text_remaining = text_max - text_length;



            $('#textarea_feedback').html(text_remaining + ' characters remaining');
    });
});

</script>

这就是我最终使用的 已解决 - 有效

 <script>

$(document).ready(function() {
    var text_max = 2000;

$('#comments').keyup(function() {
        var text_length = $('#comments').val().length;

        var text_remaining = text_max - text_length;
        localStorage.setItem("text", $('#comments').val());

        $('#textarea_feedback').html(text_remaining + ' characters remaining');
});


 $('#textarea_feedback').html(text_max + ' characters remaining');
 var text = localStorage.getItem("text");

 $('#comments').val(text);
 $('#comments').keyup();

});

</script>

Answer 1

试试这个:

$(document).ready(function() {
  var char_th = 2000;
  var text_max = 2000;
  $('#comments').keyup(function() {
    var text_length = $('#comments').val().length;

    var text_remaining = text_max - text_length;
    localStorage.setItem("text", $('#comments').val());

    $('#textarea_feedback').html(text_remaining + ' characters remaining');
  });
  $('#textarea_feedback').html(char_th + ' characters remaining');
  var text = localStorage.getItem("text");

  $('#comments').val(text);
  $('#comments').keyup();


});