title: jQuery How to check if an entry has already exist in a table?
body: <p>i'm using jquery to dynamically adding and removing rows of a table. Something like <a href="http://jsfiddle.net/yvonnezoe/MKfLU/1/" rel="nofollow">this</a>.</p>
  
  <p>My question is, how can i check if the entry (BOTH <code>output type</code> AND <code>output number</code>) has already exist in the table? so that i won't add 2 or more similar entries but update the existing one instead or just ignore or gave an alert...</p>
  
  <p>I'm clueless about the checking part. Do I need a database??</p>
  
  <pre><code>if (textInput== ??existing entry??)
  alert ("you have entered that output number for that output type");
  // quit the codes below or something?
  </code></pre>