Question

I did a bit of Googling, and I found that the following code does not work because inputs[i].className is not a string. How would I make this a string??? I tried toString(). Also, inputs.length is not 0. I checked.

for (var i = 0; i < inputs.length; i++)
{
     if (inputs[i].className.indexOf("blah") == 1)
     {
      //do something
     }
}

I want to do something with only the inputs array values that have a class name of something like “blah 1;2;3;4”.

Any help would be appreciated.

Answer 1

indexOf(value) returns -1 when no match, and a index starting with 0 when there is match.

In your case, you should compare the result with 0, instead of 1.

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Note that, if you want to test if a node has some certain class name, this is not a good practice.

A better approach is to use DOM API node.classList.contains() which is available in modern browsers.

Or use regular expression /\bblah\b/.test(node.className) to avoid the cases that blah is a substring of another class name, say not-blah.

Another way is to use mootools, which provides node.hasClass() to HTMLElement instances.

Or use jQuery like $(node).hasClass().