javascript - How do you check whether a check box is checked or not -


this question has answer here:

i'm making points application. how check whether or not check box checked , if how add 10, if not checked want nothing. here javascript. js

if (localstorage.getitem("studentlist") === null) {     localstorage.setitem("studentlist", json.stringify([])); }  studentlist = json.parse(localstorage.getitem("studentlist"));  function save() {     newstudent = {         "firstname": document.getelementbyid('sfirstname').value,         "lastname": document.getelementbyid('slastname').value,         "studentnumber": document.getelementbyid('snumber').value,         "points": document.getelementbyid('spoints').value     };        studentlist.push(newstudent);     localstorage.setitem("studentlist", json.stringify(studentlist)); }; table = document.getelementbyid("attendance"); (i = 0; < studentlist.length; i++) {     row = table.insertrow(i + 1);     cell1 = row.insertcell(0);     cell2 = row.insertcell(1);     cell3 = row.insertcell(2);     cell4 = row.insertcell(3);     cell5 = row.insertcell(4);      cell1.innerhtml = studentlist[i].firstname;     cell2.innerhtml = studentlist[i].lastname;     cell3.innerhtml = studentlist[i].studentnumber;     cell4.innerhtml = studentlist[i].points;     cell5.innerhtml = "<input type=checkbox>"; }   function username() { //this function takes values text box , stores them in objects      var studentlist = {         studentnumber: document.getelementbyid("newuser").value + index,         lastname: document.getelementbyid("newlname").value + index,         firstname: document.getelementbyid("newfname").value + index      }; }

and here's jsfiddle: https://jsfiddle.net/randomrainbow7/lm574foy/ fiddle won't show person if want hardcode in otherwise heres other html page.

<!doctype html>  <head> <!--<link href="style.css" rel="stylesheet" type="text/css">--> <script src="function.js"></script> </head> <header>     <nav>         <img src="logo.jpg"><h1 id="titt">north park clubs</h1>     <li>         <a href="attendance.html">attendance</a>         <a href="addstudent.html">add student</a>         </li>     </nav> </header>  <body> <h1>add student</h1>     <input type="text" id="sfirstname" placeholder="first name"></input>     <input type="text" id="slastname" placeholder="last name"></input>     <input type="text" id="snumber" placeholder="student number"></input>     <input type="text" id="spoints" placeholder="points"></input>     <input type="button" id="checkbox"onclick="save()" value="save"></input>  </body>

you can store informatation of 'being absent' along other information of student in json object:

store in save() function:

newstudent = {     "firstname": document.getelementbyid('sfirstname').value,     "lastname": document.getelementbyid('slastname').value,     "studentnumber": document.getelementbyid('snumber').value,     "points": document.getelementbyid('spoints').value,      "absent": document.getelementbyid('sabsent').checked };

read in for-loop table:

cell1.innerhtml = studentlist[i].firstname; cell2.innerhtml = studentlist[i].lastname; cell3.innerhtml = studentlist[i].studentnumber; cell4.innerhtml = studentlist[i].points;  cell5.innerhtml = "<input type=checkbox" + (studentlist[i].absent === true) ? "checked>" : ">"; }

write in html under <h1>add student</h1>:

<input type="checkbox" id="sabsent"></input>

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