Validate a sublimated form

Sometimes we need to make sure that the required field in a form contains data.

Example: when saving to a database.

The file add_name.cfm let the user enter the necessary data and submit the information to save_name.cfm.

The file save_name.cfm receives the submitted data and validate if the required field(s) contains data.

This is done by using two variables:
<cfset valid = True> (Boolean variable)
<cfset errormsg = ""> (String variable)

We use <cfif> statement to check if the submitted form is valid.

<cfif valid>
     Insert data into the database.
<cfelse>
     Give error message and give information about field(s) that is not correct.

     Show the user the 'Correct' button, so the user can go back and correct the necessary field(s).

     <input name="Submit" type="submit" onclick="history.back(-1)" value="Correct" />
</cfiff>

add_name.cfm

<form action="save_name.cfm" method="post">
  <p>First Name:
    <input name="First_Name" type="text" size="30" maxlength= "30" />
  </p>
  <p>Last Name:
   <input name="Last_Name" type="text" size="30" maxlength="30" />
  </p>
  <p>Country:
    <input name="Country" type="text" size="30" maxlength="30" />
  </p>
  <p>City:
    <input name="City" type="text" size="30" maxlength="30" />
  </p>
  <p>Zip:
    <input name="Zip" type="text" size="30" maxlength="30" />
  </p>
  <div align="center">
    <input name="" type="submit" />
  </div>
</form>


save_name.cfm

<!--- Start Checking the form --->
<cfset valid = True>
<cfset errormsg = "">

<!--- Check if First Name contains a value. --->  
<cfif Len(Form.First_name) IS 0>
      <cfset valid = False>
      <cfset errormsg = errormsg & "<li>First Name is required.</li><br>">
</cfif>
<!--- Check if Last Name contains a value. --->  
<cfif Len(Form.Last_name) IS 0>
      <cfset valid = False>
      <cfset errormsg = errormsg & "<li>Last Name is required.</li><br>">
</cfif>
<!--- Check if Country contains a value. --->  
<cfif Len(Form.Country) IS 0>
      <cfset valid = False>
      <cfset errormsg = errormsg & "<li>Country is required.</li><br>">
</cfif>
<!--- Check if City contains a value. --->  
<cfif Len(Form.City) IS 0>
      <cfset valid = False>
      <cfset errormsg = errormsg & "<li>City is required.</li><br>">
</cfif>
<!--- Check if Zip contains a value. --->  
<cfif Len(Form.Zip) IS 0>
      <cfset valid = False>
      <cfset errormsg = errormsg & "<li>Zip is required.</li><br>">
</cfif>

<cfif valid>
 <!--- Output submitted data.. --->
     First name: <cfoutput>#Form.First_name#</cfoutput><br />
     Last name: <cfoutput>#Form.Last_name#</cfoutput><br />
     Country: <cfoutput>#Form.Country#</cfoutput><br />
     City: <cfoutput>#Form.City#</cfoutput><br />
     Zip: <cfoutput>#Form.Zip#</cfoutput><br />
<cfelse>
     The form you submitted has the following incomplete or invalid entries:<br /><br />
     <cfoutput>#errormsg#</cfoutput><br />
     Please use the 'Correct' button to return to the previous page and correct the error(s).<br /><br />
     <input name="Submit" type="submit" onclick="history.back(-1)" value="Correct" />
</cfif>

Advertisement

No User Comments.

No User Comments, be the first one to write your comments?