As @knaccc points out, you cannot do this with just a web based blockchain explorer. However, using the command line wallet monero-wallet-cli, you can quite easily determine the output(s) you used to fund the tx as inputs. In the monero-wallet-cli:
(replacing <txid> with your actual txid), will show you your output(s) spent ...
Every transaction declares a key image for each ring of outputs being spent, where that key image relates to the true output being spent.
The only way to know whether that transaction is spending your output is to check whether any of the key images declared are key images for outputs you've previously received.
The only way to know which outputs you've ...
"prefix", "base" and "prunable" just refer to parts in the transaction.
Given the transaction hash is:
H(H(prefix) || H(base) || H(prunable))
"prefix" refers to these fields.
"base" refers to the signatures that follow the prefix.
"prunable" refers to any prunable parts of a transaction.
Here is the source that calculates transaction hashes in Monero.