ColdFusion Tutorial
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>
ColdFusion Tutorial test
Validate a sublimated form
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