https://powerusers.microsoft.com/t5/Power-Apps-Community-Blog/Prevent-user-from-entering-Special-Characters-in-a-Text-input/ba-p/894571 <P>This question came from a post I responded to and got me thinking that this was something that may be required at times, so I came up with the model in this blog. It may have other application as well as the Text Box example.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="SpecialChar.gif" style="width: 518px;"><img src="https://powerusers.microsoft.com/t5/image/serverpage/image-id/246903iF01F09E155F5D673/image-size/large?v=v2&amp;px=999" role="button" title="SpecialChar.gif" alt="SpecialChar.gif" /></span></P> <P>Firstly do a Collection of all special characters (you can do this at Screen<EM><STRONG><SPAN>&nbsp;</SPAN>OnVisible</STRONG></EM>) by using their ASCII value ranges</P> <LI-CODE lang="markup">ClearCollect( colChar, ForAll( Sequence(15), {FieldNo: Char(32 + Value)} ), ForAll( Sequence(7), {FieldNo: Char(57 + Value)} ), ForAll( Sequence(5), {FieldNo: Char(90 + Value)} ), ForAll( Sequence(4), {FieldNo: Char(122 + Value)} ) )</LI-CODE> <P>this puts 31 Special Characters into the collection under the field<SPAN>&nbsp;</SPAN><EM><FONT color="#0000FF">FieldNo</FONT></EM>. There may be some you want to allow such as underscore _ (95) so you would have to adjust the below to suit.<BR />Below is a gallery (with wrap at 4) showing the characters</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="WarrenBelz_0-1618641343827.png" style="width: 400px;"><img src="https://powerusers.microsoft.com/t5/image/serverpage/image-id/246902iDDA0E6F5E953E3DE/image-size/medium?v=v2&amp;px=400" role="button" title="WarrenBelz_0-1618641343827.png" alt="WarrenBelz_0-1618641343827.png" /></span></P> <P>Now put this on the<SPAN>&nbsp;</SPAN><EM><STRONG>OnChange</STRONG></EM><SPAN>&nbsp;</SPAN>of the Text Box</P> <LI-CODE lang="markup">ForAll( colChar, If( FieldNo in Self.Text, Collect( colError, {CharError: true} ); Reset(Self) ) )</LI-CODE> <P>NOTE - I had to use a Collection here as a Variable cannot be set inside a<SPAN>&nbsp;</SPAN><EM><STRONG>ForAll()</STRONG><SPAN>&nbsp;</SPAN></EM>statement.</P> <P>Put this on the<SPAN>&nbsp;</SPAN><EM><STRONG>OnSelect</STRONG></EM><SPAN>&nbsp;</SPAN>of the Text Box - you could also in addition put this at Screen<SPAN>&nbsp;</SPAN><EM><STRONG>OnVisible</STRONG></EM>&nbsp;</P> <LI-CODE lang="markup">Clear(colError)</LI-CODE> <P>&nbsp;Now put a<SPAN>&nbsp;</SPAN><STRONG>Label</STRONG><SPAN>&nbsp;</SPAN>(this is the warning message) on the screen with this as the<SPAN>&nbsp;</SPAN><EM><STRONG>Text</STRONG></EM></P> <LI-CODE lang="markup">"Do not use characters " &amp; Concat( colChar, FieldNo &amp; "" ) &amp; " here"</LI-CODE> <P>and this as the<SPAN>&nbsp;</SPAN><EM><STRONG>Visible</STRONG></EM></P> <LI-CODE lang="markup">First(colError).CharError</LI-CODE> <P>&nbsp;</P> Sat, 17 Apr 2021 06:42:50 GMT WarrenBelz 2021-04-17T06:42:50Z https://powerusers.microsoft.com/t5/Power-Apps-Community-Blog/Prevent-user-from-entering-Special-Characters-in-a-Text-input/ba-p/894571 <P>This question came from a post I responded to and got me thinking that this was something that may be required at times, so I came up with the model in this blog. It may have other applications as well as the Text Box example.</P> Sat, 17 Apr 2021 06:42:50 GMT https://powerusers.microsoft.com/t5/Power-Apps-Community-Blog/Prevent-user-from-entering-Special-Characters-in-a-Text-input/ba-p/894571 WarrenBelz 2021-04-17T06:42:50Z https://powerusers.microsoft.com/t5/Power-Apps-Community-Blog/Prevent-user-from-entering-Special-Characters-in-a-Text-input/bc-p/895463#M1088 <P>I like that. Thanks for sharing!</P><P>&nbsp;</P><P>In my cases, I would modify it to not reset the text input control. <span class="lia-unicode-emoji" title=":winking_face:">😉</span></P> Mon, 19 Apr 2021 06:46:35 GMT https://powerusers.microsoft.com/t5/Power-Apps-Community-Blog/Prevent-user-from-entering-Special-Characters-in-a-Text-input/bc-p/895463#M1088 max81 2021-04-19T06:46:35Z https://powerusers.microsoft.com/t5/Power-Apps-Community-Blog/Prevent-user-from-entering-Special-Characters-in-a-Text-input/bc-p/956277#M1105 <P>Excellent article!</P> Thu, 17 Jun 2021 13:08:27 GMT https://powerusers.microsoft.com/t5/Power-Apps-Community-Blog/Prevent-user-from-entering-Special-Characters-in-a-Text-input/bc-p/956277#M1105 JR-BejeweledOne 2021-06-17T13:08:27Z