forms - Illegal character when trying to escape square brackets with jquery -

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Using jquery form plugin I was trying to test the value of a form element which uses square brackets is. 

  var form = jqForm [0]; If (! Form.sendTo \\ [\\]. Value] {Warning ('some'); return false; }   
 Despite trying to avoid the brackets, it is still giving me an error.  
 Invalid character  
 [break this error] If (! Form.sendTo \ [\]. Value] { 
 Is not it possible to do this?  
 Thank you   
 
 
 You place JavaScript in place of a dot bracket and dot-notation Can use a string. Then try it out:  
  var form = jqForm [0]; If (! Form ["send []"]. Value) {warnings ('some'); return false; }   
 
 Edit after comments:  
 Using jQuery, you can determine how many checked check boxes are using the code Such as:  
  $ ('input [name =' dispatch [] "]: checked ', form).   
 value  form  refers to a jQuery object form that has a checkbox, if it is not, you may be able to wrap it like in the above example  $ (form)   
 Live example:

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