GetValueFromInputField ( fieldname ; sourcecode )

Gets the value of an input field from HTML source.

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Brian Dunning - Show more from this author
BrianDunning.com
https://www.briandunning.com

Sample input:

GetValueFromInputField ( "fname" ; "input type=\"hidden\" name=\"fname\" value=\"brian\"" )

Sample output:

brian

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Case ( 

PatternCount ( sourcecode ; "\"" & fieldname & "\"" ) = 0 ; "" ;

Let ( [

fieldpos = Position ( sourcecode ; "\"" & fieldname & "\"" ; 1 ; 1 ) ;
snip1 = Middle ( sourcecode ; fieldpos ; 99999 ) ;
valuepos = Position ( snip1 ; "value=" ; 1 ; 1 ) ;
snip2 = Middle ( snip1 ; valuepos + 7 ; 99999 ) ;
endquotepos = Position ( snip2 ; "\"" ; 1 ; 1 )

] ;

Left ( snip2 ; endquotepos - 1 )

 ) )

Grab the value of an input field from HTML source. Especially useful when trying to parse out the contents of hidden fields.

The HTML does have to be well-formed. The name parameter must precede the value parameter. Both must be properly quoted.

Comments

		Cristos, Northampton, MA Nov 13, 2014
Recommend the following adjustment, to search for the "id" attribute instead of just the fieldname. Without this adjustment, other mentions of the fieldname in the code (e.g., in javascript headers) can cause unexpected results. fieldpos = Position ( sourcecode ; "id=\"" & fieldname & "\"" ; 1 ; 1 ) ;

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

GetValueFromInputField ( fieldname ; sourcecode )

Comments

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