javascript toString converts long numbers to Infinity

Question

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How to avoid scientific notation for large numbers in javascript?

Hi All,

Doing something like this

alert(999999999999999999999999999999999999999999999999);

results in this

Javascript Popup 1e+48

How to i stop converting a number to a string from saying 1e+XX or Infinity?

@Andrew putting in higher numbers ends up at javascript saying infinity — Timothy Ruhle, Mar 03 '11 at 02:08
@zoidbery the user enters text in a textarea and then shows it on the screen (very similar to this comment feature) and i convert it to a string so i can change < and > to < and > so it displays. If the user enters a long number then the number.toString() converts to 1e+XX — Timothy Ruhle, Mar 03 '11 at 02:13
It gets sent to the database as a string and stored in a [TEXT] field. But whenever i get it from the database and try to show it it says infinity. — Timothy Ruhle, Mar 03 '11 at 02:26
@Timothy The user enters a string into the textarea, not a number. What number are you talking about? — Šime Vidas, Mar 03 '11 at 02:27

score 1 · Answer 1 · answered Mar 03 '11 at 02:21

1

No one seems to have provided the most obvious solution which is to enclose in quotes so that javascript treats it as a string and not a number.

alert('999999999999999999999999999999999999999999999999');

answered Mar 03 '11 at 02:21

krock

score 1 · Accepted Answer · answered Mar 03 '11 at 02:21

There is only so many digits that will actually be able to maintain precision so when you reach that limit it starts using the e+ notation...

alert(' '+ 12345678901234567890 + ' ')

Will output 12345678901234567000

So for example also if you did

alert(' '+ 999999999999999999 + ' ')

You get 1000000000000000000

GL...

2 Answers2