Reading form values

Read first Task 27

input.value is always a string — convert before maths.

Definition and example

Reading form values is the focus of this lesson. input.value is always a string — convert before maths. The task asks you to apply that idea in a small example: What type is input.value. Before you run the code, predict what should happen. Then Inspect the browser output and the value your code produces and compare it with your prediction. If the result differs, change one relevant line and run it again. Testing one change at a time makes the cause of a result easier to understand.

JavaScript 1 automatic check The DOM

Code editor Ctrl + Enter runs

// TASK reading-form-values-07: What type is input.value?
// STEPS: Read the explanation. Change one relevant line at a time, then run the code and compare the result with the check on the right.
const i=document.createElement('input');
i.value='42';
document.body.appendChild(i);
console.log(Number(i.value)+1);

Run your code to see the output and the checks.

Your result

Submit your code to see results

Write your code in the middle column and press Run code.

Checks on this task:

The output must include “43”.

The task and step-by-step instructions are written as comments at the top of the editor. Change one relevant line, run it, and compare the result with these checks.

Incorrect attempts before answer: 0 / 3

Track progress

0 passed of 56 tasks

Pass every check or use one of your available skips to open the next task.

← Previous

Next task (pass every check first)

Reading form values

Reading form values

Why this works