jQuery with Javascript check substring of text

Question

I am wondering if there's any way to make this possible. I want to to check if the text value of an element begins with a certain letter.

This is my non working code:

if ($('title').text().substring(0, 1) === 'W') {
        $('body').css('background', '#27aae2');
}

Works for me -> jsfiddle.net/adeneo/sh9kh7ty, indexOf would probably be easier ? — adeneo
– adeneo, Commented Apr 21, 2015 at 20:49
document.title gets the title as a string. No need to overuse jQuery for that. — zzzzBov
– zzzzBov, Commented Apr 21, 2015 at 20:55

Rahul Tripathi · Accepted Answer · 2015-04-21 20:49:42Z

3

you can try like this:

if(yourString.indexOf('A') === 0) {
}

answered Apr 21, 2015 at 20:49

Rahul Tripathi

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4 Comments

Why search the entire string when you can just test the first letter, like the original code does?

If you're going to optimize that part, do yourString[0] == 'a'

@arcyqwerty so long as the programmer is aware yourString[0] may be undefined (use ===)

undefined == 'a' would be false as expected, same as your implementation (-1 !== 0).

Alex · Accepted Answer · 2015-04-21 21:00:03Z

0

Yes this work, see code snippet below. Please note it was created based on your original post.

$(document).ready(function() {
  if ($('#element').text().substring(0, 1) === 'A') {
    alert('Do something useful')
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="element">A hello</div>

answered Apr 21, 2015 at 21:00

Alex

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