Getting web3 0.20.3 (Same as MetaMask)

Question

When creating a site with MetaMask, you also want that other users who do not have MetaMask can use this site. To do this, you want to use the same library MetaMask uses - which is 0.20.3 currently.

I cannot find 0.20.3. I checked GitHub releases. Version 1.0.0-beta is up, and older versions do not hit 0.20.3

Where can I find this web3 version?

Answer 1

Metamask injects in the page web3 and you can use this one without including any web3 scripts in your page.

web3 = new Web3(web3.currentProvider);

You can check for metamask and alert message to the user if he donesn't have.

if (typeof web3 !== 'undefined') {
    web3 = new Web3(web3.currentProvider);
} else {
    alert('Please install metamask', 'Metamask!');
}