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Angular JS tamaño de un array lenght size array

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<span class="pln">$scope</span><span class="pun">.</span><span class="pln">lsCanasta </span><span class="pun">=</span><span class="pln"> </span><span class="pun">[</span><span class="pln">
    </span><span class="str">"p1"</span><span class="pun">,</span><span class="pln">
    </span><span class="str">"p2"</span><span class="pun">,</span><span class="pln">
    </span><span class="str">"p3"</span><span class="pun">,</span><span class="pln">
    </span><span class="str">"p4"</span><span class="pun">,</span><span class="pln">
    </span><span class="str">"p5"</span><span class="pln">
</span><span class="pun">];</span><span class="pln">
 
</span><span class="kwd">if</span><span class="pun">((</span><span class="pln">$scope</span><span class="pun">.</span><span class="pln">lsCanasta</span><span class="pun">).</span><span class="pln">length</span><span class="pun">></span><span class="lit">0</span><span class="pun">){</span><span class="pln">
    $</span><span class="pun">(</span><span class="str">"#btcontratar"</span><span class="pun">).</span><span class="pln">removeClass</span><span class="pun">(</span><span class="str">"bt-disabled"</span><span class="pun">);</span><span class="pln">
    $</span><span class="pun">(</span><span class="str">"#btcontratar"</span><span class="pun">).</span><span class="pln">removeAttr</span><span class="pun">(</span><span class="str">"disabled"</span><span class="pun">);</span><span class="pln">          
</span><span class="pun">}</span><span class="kwd">else</span><span class="pun">{</span><span class="pln">
    $</span><span class="pun">(</span><span class="str">"#btcontratar"</span><span class="pun">).</span><span class="pln">addClass</span><span class="pun">(</span><span class="str">"bt-disabled"</span><span class="pun">);</span><span class="pln">
    $</span><span class="pun">(</span><span class="str">"#btcontratar"</span><span class="pun">).</span><span class="pln">attr</span><span class="pun">(</span><span class="str">"disabled"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"disabled"</span><span class="pun">);</span><span class="pln">         
</span><span class="pun">}</span>

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