如何在javascript中将输入值设置为对象属性的值

Question

I want to set the input value to be a object's property's value, here is the code in jsfiddle ,
I also put the code here:
html

<div id="contenu"></div>  

js

// create the button
var contenu = document.getElementById("contenu");
var btn = document.createElement("button");
btn.textContent = "add";
contenu.appendChild(btn);

// click the button to create 2 inputs and submit
btn.addEventListener("click", function(){
    // create 2 inputs and submit
    var name = document.createElement("input");
    name.placeholder = "enter a name";
    var age = document.createElement("input");
    age.placeholder = "enter the age";
    var submit = document.createElement("input");
    submit.type = "submit";
    submit.value = "submit";
    var form = document.createElement("form");
    form.method = "post";
    form.appendChild(name);
    form.appendChild(age);
    form.appendChild(submit);
    contenu.appendChild(form);

    // create a new empty table
    var newTable = [];
    var newObject = {};
    newObject.name = name.value;//"Tom" will work
    newObject.age = age.value;//20 will work
    newTable.push(newObject);

    // submit the form to show the input value in html
    form.addEventListener("submit", function(e){
        newTable.forEach(function(table){
            e.preventDefault();
            var pElt = document.createElement("p");
            pElt.innerHTML = table.name + " " + table.age;  
            contenu.appendChild(pElt);
        });   
    });
});

Objective: click the "add" button to show 2 inputs and the "submit" button, enter the name and the age, then click "submit" to show them in the div , I put the input's value as the property's value of the object, newObject.name = name.value; and newObject.age = age.value; but it dosen't work, thanks for your help!

Answer 1

I fixed your fiddle, you can check it out here:

https://jsfiddle.net/o08mua1y/

    form.addEventListener("submit", function(e){
        newObject.name = name.value;//"Tom" will work
        newObject.age = age.value;//20 will work
        newTable.forEach(function(table){
            e.preventDefault();
            var pElt = document.createElement("p");
            pElt.innerHTML = table.name + " " + table.age;  
            contenu.appendChild(pElt);
        });   
    });

The issue is that you are trying to set the value of the name, and age field in the listener that creates your input fields, not in the listener that fires on submission of the inputs. If you set those values inside the submit listener, before the forEach loop the values will be set, and be displayed in your HTML as intended

Answer 2

name and age do not have a value at the time that you create the newObject . You need to attach an event listener like keyup or keydown or change to the input field to fire a function to set the values in the object.

Answer 3

Not sure what you did there but this makes it work. Take a look.

// create de button
var contenu = document.getElementById("contenu");
var btn = document.createElement("button");
btn.textContent = "add";
contenu.appendChild(btn);

// click the button to create 2 inputs and submit
btn.addEventListener("click", function(){
// create 2 inputs and submit
var name = document.createElement("input");
name.placeholder = "enter a name";
var age = document.createElement("input");
age.placeholder = "enter the age";
var submit = document.createElement("input");
submit.type = "submit";
submit.value = "submit";
var form = document.createElement("form");
form.method = "post";
form.appendChild(name);
form.appendChild(age);
form.appendChild(submit);
contenu.appendChild(form);

// create a new empty table
var newTable = [];


// submit the form to show the input value in html
form.addEventListener("submit", function(e){
  var newObject = {};
  newObject.name = name.value;//"Tom" will work
  newObject.age = age.value;//20 will work
  newTable.push(newObject);
  var pElt = document.createElement("p");
  pElt.innerHTML = newObject.name + " " + newObject.age;  
  contenu.appendChild(pElt);   
  e.preventDefault();
});
});