How to judge if a parameter is null ?

icy · Post time 2020-5-14 16:18:10

Hi,
I used a parameter for the data query. I wanna realize selecting all in a drop-down checkbox when the parameter is null. I am looking for a way to test whether the parameter was null
Thanks

Best Answer

hi Icy, Use formula for your test. Suppose the parameter is named p, and judge whether the parameter length is zero using len($p)==0.

Seigann
Published on2020-05-15
Detailed Answer>>

Sybil · Post time 2020-5-15 09:56:07

hi Icy,

Use formula for your test.
Suppose the parameter is named p, and judge whether the parameter length is zero using len($p)==0.

[solved] How to judge if a parameter is null ?

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