javascript - How to use a cookie to save the clicked value grab the cookie every time the user opens the page -


i have following code highlight table record 3 different colors when user click checkbox. how can use cookie save clicked value grab cookie every time user opens page everytime? haven't no idea how cookies used. answer appreciate

<!doctype html> <html> <head> <meta charset="utf-8"> <title>untitled document</title> </head>  <body> <style> .highlight-red {     background-color: red; }     .highlight-green {     background-color: green; } .highlight-yellow {     background-color: yellow; }     </style> <div class="col-lg-10">     <table id="table" border="1">         <tr class="highlight">         <td><input type="checkbox" name="cb1" id="cb1" value="y" onchange="changesoma(this, 'red')" /></td>         <td>click me</td>         </tr>         <tr>         <td><input type="checkbox" name="cb2" id="cb2" value="y" onchange="changesoma(this, 'green')" /></td>         <td>click me</td>         </tr>         <tr>         <td><input type="checkbox" name="cb3" id="cb3" value="y" onchange="changesoma(this, 'yellow')" /></td>         <td>click me</td>         </tr>     </table> </div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script>      function changesoma(data, color){             if(data.checked && color == 'red'){                 $(data).parent().parent().addclass("highlight-red");             }             else{                 $(data).parent().parent().removeclass("highlight-red");             }             if(data.checked && color == 'green'){                 $(data).parent().parent().addclass("highlight-green");             }             else{                 $(data).parent().parent().removeclass("highlight-green");             }             if(data.checked && color == 'yellow'){                 $(data).parent().parent().addclass("highlight-yellow");             }             else{                 $(data).parent().parent().removeclass("highlight-yellow");             }     } </script> </body> </html>

localstorage easier cookie thought . can set , localstorage.setitem or localstorage.getitem , remain until remove them !!!

<script>      var cond = json.parse(localstorage.getitem("check"));     for(var in cond) {         if(cond[i]) {          $("#"+i).attr("checked",true);          $("#"+i).parent().parent().addclass("highlight-"+cond[i]);         }     }     function changesoma(data, color){             var state;             if(localstorage.getitem("check") == null) {                 state = {cb1:0,cb2:0,cb3:0};             } else{                 state = json.parse(localstorage.getitem("check"));             }              if(data.checked) {                 $(data).parent().parent().addclass("highlight-"+color);                 state[data.id]= color;             } else {                 $(data).parent().parent().removeclass("highlight-"+color);                 state[data.id]= 0;             }             localstorage.setitem("check",json.stringify(state));     } </script>

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