Setting the IFrame height dynamically

Awesome HTML5 feature that helps to set the IFrame height dynamically.

Use the following script

<script type="text/javascript" >
$(document).ready(function(){
    window.setInterval(resizeParentIframe, 2000);
 });

var pastHeight = 0;

function resizeParentIframe() {
var currentHeight = document.body.scrollHeight;
if (currentHeight != pastHeight){
pastHeight = currentHeight;
parent.postMessage(document.body.scrollHeight, '*');
}
}
</script>

ERROR: Error installing rails: activesupport requires Ruby version >= 1.9.3.

Check whether you are trying to install the correct version of Rails that are compatible with your Ruby Version.

You can check the ruby version by running the cmd "ruby -v"

Rails Version	Possible Ruby Versions	Recommended Ruby Version
1.0–2.1	1.8.6	1.8.6
2.2	1.8.6 or 1.8.7	1.8.7
2.3	1.8.6, 1.8.7, or 1.9.1	1.8.7
3.0–3.2	1.8.7, 1.9.2, or 1.9.3	1.9.3
4.0–…	1.9.3, 2.0.x	2.0.x

then try to install the rails

sudo gem install rails --version 3.2.12

brew: command not found

If HomeBrew is not installed, Please follow the instruction mentioned here

1. Install XCode, check whether command line tools are installed or not.

2. $ gcc --version

3. It will display "i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."

4. Then you can execute the following command to install the home brew

$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

5. It will display "You should run `brew doctor' *before* you install anything." as last sentence after installing the home brew

6. Now type "$ brew doctor" .

7. Before implementing the recommendation, make sure whether it correct or not.

8. Finally, $brew update. That's it.

Reference : http://ricardianambivalence.com/2012/10/02/install-homebrew-on-your-mac-a-tutorial/

Install RVM Error

Can not find compiler and 'make' tool - make sure Xcode and/or Command Line Tools are installed.

1. Check whether you have install Xcode and its command line tools.

2. After installing the XCode, click on Xcode -> Preferences -> downloads

3. Check whether "Command Line Tools" got installed or not.