Javascript jQuery: find array elements within a string

Question

I think my question is fairly straightforward but I'm not very experienced with Javascript. What I am trying to do is pull the source code of a page and stick it all into a variable:

var sourcecode = document.documentElement.innerHTML;

Then I have an array of terms that I want to search that variable for:

var array = ['Huskers','Redskins','Texans','Rockets'];

I would like to assign a 0 to any of the array elements that aren't found in the sourcecode variable and a 1 to any that are. So, when the search is complete each array element will be represented by a variable that will either equal 1 or 0. Can anyone please give me a hint as to how I should go about this?

Thanks!

what is your problem? find the array element in sourcecode or something else? — leonhart
– leonhart, Commented Jun 12, 2013 at 3:14
I know how to search through the sourcecode for individual strings: If (sourcecode.indexOf('Huskers')) != -1 {Huskers = 1} but I'm thinking that if I do each search separately it will have to scroll through the entire string each time. — Jared Venema
– Jared Venema, Commented Jun 12, 2013 at 3:33
so this is the critical problem, you should add it to you post otherwise you only get answer about how to search them one by one. — leonhart
– leonhart, Commented Jun 12, 2013 at 3:41

elclanrs · Accepted Answer · 2013-06-12 03:32:31Z

3

A bit cryptic but does what you need:

var source = 'lorem hello foo bar world';
var words = ['hello','red','world','green'];

words = words.map(function(w){ return +!!~source.indexOf(w) });

console.log(words); //=> [1, 0, 1, 0]

+!!~ casts a number of the boolean representation of the value returned by indexOf, same as:

return source.indexOf(w) == -1 ? 0 : 1;

But a bit shorter.

Note that indexOf matches strings within strings as well, if you want to match whole words you can use regex with word boundaries \b:

words = words.map(function(w) {
  return +new RegExp('\\b'+ w +'\\b','gi').test(source);
});

edited Jun 12, 2013 at 3:32

answered Jun 12, 2013 at 3:17

elclanrs

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1 Comment

Jared Venema Over a year ago

OK, I need to figure out what you are doing here exactly but I will try it out. Thank you!

sravis · Accepted Answer · 2013-06-12 03:18:45Z

1

If you want to find element in array you can use jquery $.inArray()

http://jsfiddle.net/hgHy4/

$(document).ready(function() {

var array = ['Huskers','Redskins','Texans','Rockets'];

    alert($.inArray('Redskins', array));


});

This will returns index number of element inside an array if it is found. If the element is not found it will return -1

answered Jun 12, 2013 at 3:18

sravis

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