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JavaScript

Posted by Kyle Myers
Kyle Myers
1,051 Points

How can you pass the Id input of a form to variable then back to html id?

The value of totalExpenses flashes on the screen. How would you get the value to stay there just using JavaScript?

<body>
<form >

    Rent: <input type="text" name="monthRent" id="monthRent">
    Electric: <input type-"text" name="monthElectric" id="monthElectric">
    Phone: <input type="text" name="monthPhone" id="monthPhone">
    InterWebs: <input type="text" name="monthWeb" id="monthWeb">

<button onclick="myFunction()"> Try it</button>

<p id="outPut">


</p>

function myFunction() {

    var monthRent = document.getElementById("monthRent").value;
    var monthElectric = document.getElementById("monthElectric").value;
    var monthPhone = document.getElementById("monthPhone").value;
    var monthWeb = document.getElementById("monthWeb").value;

    var totalExpenses = parseInt(monthRent) + parseInt(monthElectric) + parseInt(monthPhone) + parseInt(monthWeb);

    document.getElementById("outPut").innerHTML = totalExpenses;


}

1 Answer

Colin Marshall
Colin Marshall
32,861 Points
Colin Marshall
Colin Marshall
32,861 Points

You should handle the onclick in your JavaScript so that you can prevent the default action when the button is clicked. Add this to your javascript after myFunction():

document.getElementById("sum-button").onclick=function(e){
    e.preventDefault();
    myFunction(); 
}

Then change your html button to the following:

<button id="sum-button">Try it</button>
Kyle Myers
Kyle Myers
1,051 Points

This still isn't working for me. Does that code go after function myFunction {

}

..code here?