CODEWITHSUNDEEP
javascriptstring
Sir Meysam Ferguson
Sir Meysam Ferguson

Reputation: 193

Javascript: slice and substring not working as expected

I expect to give me 4 characters from second position. but doesn't.

<body id = "A">
<script>
var s = document.getElementById("A");
var d = "Hello, world";
s.innerHTML = d.substring(2,4);
</script>

It work when:

d.substring(0,4);

Upvotes: 0

Views: 4434

Answers (2)

ErstwhileIII
ErstwhileIII

Reputation: 4843

The arguments for substring are start and end, not start and length.

string.substring(start,end)
Parameter Values
Parameter   Description
start   Required. The position where to start the extraction. First character is at index 0
end     Optional. The position (up to, but not including) where to end the extraction. If omitted, it extracts the rest of the string

There is an addition function substr that has arguments of start and length

string.substr(start,length)
Parameter Values
Parameter   Description
start   Required. The position where to start the extraction. First character is at index 0
length  Optional. The number of characters to extract. If omitted, it extracts the rest of the string

You can see more at "W3Schools" here .. you may find this a useful reference for other issues you encounter.

Upvotes: 8

Dhaval Marthak
Dhaval Marthak

Reputation: 17366

You need substr()

var s = document.getElementById("A");
var d = "Hello, world";
s.innerHTML = d.trim().substr(2,4);

Fiddle

substr() and substring() are different methods!

Upvotes: 3

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