当我在数组中推送一个对象时，它仍然是空的

Question

Whenever my form is submitted nothing happens and when I check my array on the console it remains empty. In order to target values of input I need to put it in a function I also use return in function but nothing happens. Actually I want user data collected in object and push into array whenever I click on submit button...

 var labelsarray = document.getElementsByTagName("label"); var inputsarray = document.getElementsByTagName("input"); var array = []; function subm() { var users = { FirstName: inputsarray[0].value, LastName: inputsarray[1].value, UserName: inputsarray[2].value, Password:  inputsarray[3].value, DateofBirth: inputsarray[4].value, Age: inputsarray[5].value, Gender: inputsarray[6, 7].checked, Purpose: inputsarray[8, 9, 10].checked }; array.push(users); } 

 <div> <center> <form method="post" onsubmit="subm();"> <label for="fname">First Name:</label>&emsp; <input type="text" id="fname" /> <br/> <label for="lname">Last Name:</label>&emsp; <input type="text" id="lname" /> <br/> <label for="uname">User Name:</label>&emsp; <input type="text" id="uname" /> <br/> <label for="pass">Password:</label>&emsp;&ensp;&nbsp; <input type="text" id="pass" /> <br/> <label for="dob">Date of Birth:</label>&emsp;&emsp;&nbsp; <input type="date" id="dob" /> <br/> <label>Age:</label>&emsp;&emsp;&emsp;&emsp;&emsp; <input type="text" id="age" /> <br/> <span>Gender:</span>&emsp;&emsp;&emsp;&emsp;&ensp; <input type="radio" name="gender" id="male" /> <label for="male">Male</label> <input type="radio" name="gender" id="female" /> <label for="female">Female</label> <br/> <p>For what purpose(s) you are making account?</p> <input type="checkbox" id="app" name="purpose" value="storingapps" /> <label for="app">Storing Apps</label> <input type="checkbox" id="site" name="purpose" value="storingsites" /> <label for="site">Storing Sites</label> <input type="checkbox" id="fun" name="purpose" value="fun" /> <label for="fun">Fun</label> <br/> <input type="submit" value="Submit" class="button" /> </form> </center> </div> 

Answer 1

When you push the submit button, you start the form submission process.

First the onsubmit function runs. This modifies your array.

Then the form submits and loads a new page.

This is (presumably) the same page that the user is already looking at. It's a fresh copy of it though, so it doesn't contain the array from the old version of it.

---

You can return false; at the end of the onsubmit function to prevent form submission.

Modern code would use addEventListener (introduced about two decades ago) and call the preventDefault method of the event object.

document.querySelector("form").addEventListener("submit", subm);
function subm(event) {
    event.preventDefault();
    // etc
}