Convert string issue

JavaScript
1

An input of “5 . 5 . 5” should display 5.55 : expected ‘5.5.5’ to equal ‘5.55’

So I need to convert from 5.5.5 to 5.55 .
How to do that?
Any Help or tips?

2

How far have you got with this?

3

Sorry I don’t understand !!!
What do you mean?

4

What rules is your conversion expected to follow?

5

for example why is your expected output 5.55 and not 55.5?

IF you know there will always be 2 decimal points you could: remove all ‘.’ and divide by 100.

let num = '5.5.5';
num = num.replace('.','')/100
6

I suspect that it’s to clean up accidental entries by removing all but the first decimal point.

7

Assuming that someone entered “5.5.5” into an input field, and we are supposed to remove multiple decimals, that can be done like this:

function dotFilter(str) {
  const firstDotIndex = str.indexOf(".");
  return str.split("").filter(function removeExtraDecimals(char, index) {
    if (char === ".") {
      return index === firstDotIndex;
    }
    return true;
  }).join("");
}

Which in the context of a form with other possible sanitise methods, could be included with the following:

function sanitise(field) {
  if (field.name === "price") {
    return dotFilter(field.value);
  }
}

function fieldChangeHandler(evt) {
  const field = evt.target;
  field.value = sanitise(field);

}
const formFields = document.querySelectorAll("input");
formFields.forEach(function addEventHandler(field) {
  field.addEventListener("change", fieldChangeHandler);
});

Here’s an example page to play with: https://jsfiddle.net/841mfg23/

8

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