de_validation'>client_side_validation</span> <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='id identifier rubyid_opts'>opts</span><span class='lbracket'>[</span><span class='symbol'>:&#39;page&#39;</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_nil?'>nil?</span> <span class='op'>&amp;&amp;</span> <span class='id identifier rubyid_opts'>opts</span><span class='lbracket'>[</span><span class='symbol'>:&#39;page&#39;</span><span clas