javascript - Unable to get property 'FromDate' of undefined or null reference -

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i have asp page jscript calendar in keep getting message below

****unable property 'fromdate' of undefined or null reference****

the code i've run is: 

<input class=datebutton style="position: relative" onclick="showcalendar(this.form.fromdate.value,  this,  this.form.fromdate)" type=button value=" >>> " name=cmdshowcalendar>     </td></tr>

the error message says this.form undefined or null. means input doesn't belong form. either:

  • put in <form>
  • use form attribute identify form belongs to
  • use other dom method find element trying reference

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