javascript - get value of input in casperjs -


Hi all I would like to know how to get an input value with the capacitors

This is my html element 

  & lt; Input type = "hidden" name = "key" value = "new" and gt;   
 This is what I've tried:  
  visible = 'user / registered'; casper.test.begin ("activation account", 5, function register (test) {casper.start (webroot + view, function () {}). then (function () {retrieve data from this.echo ("hidden input") ActivationKey = this.evaluate (function () {return __utils __. GetFieldValue ('key';;}}}} then (function () {this.echo ("account with key" ActivateKey + "\" "," COMMENT "); window.location = webroot + activationKey;}); casper.run (function () {this.echo ('account successful activation', 'success' ) Exit (); test.done ();});}); Casper.viewport (page wide, p. Hi);   
 In this case return  null   
 I have also tried:  
  activationKey = __utils__ getFieldValue ('key');   
 But return this error to me:  
  FAIL ReferenceError: The variable can not be found: __utils__    
 
 
 Try to use it:  
  this.getElementAttribute ('input [type = "hidden" ] [Name = "fundamental value");

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