Hallo allemaal, ik ben relatief nieuw met Arcade maar kan deze When-functie niet begrijpen. Ik heb een Right-expressie die de laatste drie tekens van een veld $feature.info_headline retourneert wanneer toegepast als een aparte arcade-expressie. Echter, wanneer ik dezelfde expressie toepas als een variabele vóór een When-expressie, krijg ik geen fouten bij het testen maar ook geen resultaten terug? Kan iemand aangeven waar ik fout ga met deze expressie? Is er een regel over variabelen die ik mis? var right3 = Right($feature.info_headline, 3); var warning_level = When(right3=='Red', 'Red', right3=='nge', 'Orange', 'Watch'); Ik probeer de expressie te laten vullen in een nieuwe Color Style zodat als de laatste drie tekens in het veld $feature.info_headline zijn 'Red' de waarde 'Red' wordt teruggegeven, of als de laatste drie tekens 'nge' zijn de waarde 'Orange' wordt teruggegeven, anders 'Watch'. Ik weet dat er misschien opties zijn met geneste IIf-functies maar ik dacht dat de When-functie eenvoudig genoeg zou zijn om te doen wat ik probeer. Groeten Derek

Hi Derek Phyn , That is correct you should always return the result of the expression. For readability especially when you have a lot of values to check you could spread the "when parts" over multiple lines like this: var right3 = Right ( $feature . info_headline , 3 ) ; return When ( right3 == 'Red' , 'Warning - Red' , right3 == 'nge' , 'Warning - Orange' , 'Watch' ) ; I also often use if - else if - else statements: var right3 = Right ( $feature . info_headline , 3 ) ; if ( right3 == 'Red' ) { return 'Warning - Red' ; } else if ( right3 == 'nge' ) { return 'Warning - Orange' ; } else { return 'Watch' ; } You can also use a dictionary with the options: var right3 = Right ( $feature . info_headline , 3 ) ; var dct = { 'Red' : 'Warning - Red' , 'nge' : 'Warning - Orange' } ; if ( HasKey ( dct , right3 ) ) { return dct [ right3 ] ; } else { return 'Watch' ; }

nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

Arcade When-expressie geeft geen resultaten terug

DerekPhyn

<\/HEAD>

Hallo allemaal, ik ben relatief nieuw met Arcade maar kan deze When-functie niet begrijpen. Ik heb een Right-expressie die de laatste drie tekens van een veld $feature.info_headline retourneert wanneer toegepast als een aparte arcade-expressie. Echter, wanneer ik dezelfde expressie toepas als een variabele vóór een When-expressie, krijg ik geen fouten bij het testen maar ook geen resultaten terug? Kan iemand aangeven waar ik fout ga met deze expressie? Is er een regel over variabelen die ik mis? <\/P>

<\/P>

var right3 = Right($feature.info_headline, 3);
var warning_level = When(right3=='Red', 'Red', right3=='nge', 'Orange', 'Watch');<\/P>

<\/P>

Ik probeer de expressie te laten vullen in een nieuwe Color Style zodat als de laatste drie tekens in het veld $feature.info_headline zijn 'Red' de waarde 'Red' wordt teruggegeven, of als de laatste drie tekens 'nge' zijn de waarde 'Orange' wordt teruggegeven, anders 'Watch'.<\/SPAN><\/P>
Ik weet dat er misschien opties zijn met geneste IIf-functies maar ik dacht dat de When-functie eenvoudig genoeg zou zijn om te doen wat ik probeer.<\/SPAN><\/P>
Groeten<\/SPAN><\/P>Derek<\/SPAN><\/P><\/BODY><\/HTML>

Vind meer berichten getagd met

Accepted answers

XanderBakker

Hi Derek Phyn ,

That is correct you should always return the result of the expression.

For readability especially when you have a lot of values to check you could spread the "when parts" over multiple lines like this:

<SPAN class="keyword token">var</SPAN> right3 <SPAN class="operator token">=</SPAN> <SPAN class="token function">Right</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>info_headline<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">return</SPAN> <SPAN class="token function">When</SPAN><SPAN class="punctuation token">(</SPAN>right3<SPAN class="operator token">==</SPAN><SPAN class="string token">'Red'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Warning - Red'</SPAN><SPAN class="punctuation token">,</SPAN> 
            right3<SPAN class="operator token">==</SPAN><SPAN class="string token">'nge'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Warning - Orange'</SPAN><SPAN class="punctuation token">,</SPAN> 
            <SPAN class="string token">'Watch'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

I also often use if - else if - else statements:

<SPAN class="keyword token">var</SPAN> right3 <SPAN class="operator token">=</SPAN> <SPAN class="token function">Right</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>info_headline<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>right3 <SPAN class="operator token">==</SPAN> <SPAN class="string token">'Red'</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Warning - Red'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN> <SPAN class="keyword token">else</SPAN> <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>right3 <SPAN class="operator token">==</SPAN> <SPAN class="string token">'nge'</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Warning - Orange'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN> <SPAN class="keyword token">else</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Watch'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

You can also use a dictionary with the options:

<SPAN class="keyword token">var</SPAN> right3 <SPAN class="operator token">=</SPAN> <SPAN class="token function">Right</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>info_headline<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> dct <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'Red'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'Warning - Red'</SPAN><SPAN class="punctuation token">,</SPAN>
           <SPAN class="string token">'nge'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'Warning - Orange'</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="token function">HasKey</SPAN><SPAN class="punctuation token">(</SPAN>dct<SPAN class="punctuation token">,</SPAN> right3<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> dct<SPAN class="punctuation token">[</SPAN>right3<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN> <SPAN class="keyword token">else</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Watch'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

DerekPhyn

Stand down. Solutions found include:

When(Right($feature.info_headline, 3)=='Red', 'Warning - Red', Right($feature.info_headline, 3)=='nge', 'Warning - Orange','Watch')

var right3 = Right($feature.info_headline, 3);

return When(right3=='Red', 'Warning - Red', right3=='nge', 'Warning - Orange', 'Watch');

XanderBakker

Hi Derek Phyn ,

That is correct you should always return the result of the expression.

For readability especially when you have a lot of values to check you could spread the "when parts" over multiple lines like this:

<SPAN class="keyword token">var</SPAN> right3 <SPAN class="operator token">=</SPAN> <SPAN class="token function">Right</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>info_headline<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">return</SPAN> <SPAN class="token function">When</SPAN><SPAN class="punctuation token">(</SPAN>right3<SPAN class="operator token">==</SPAN><SPAN class="string token">'Red'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Warning - Red'</SPAN><SPAN class="punctuation token">,</SPAN> 
            right3<SPAN class="operator token">==</SPAN><SPAN class="string token">'nge'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Warning - Orange'</SPAN><SPAN class="punctuation token">,</SPAN> 
            <SPAN class="string token">'Watch'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

I also often use if - else if - else statements:

<SPAN class="keyword token">var</SPAN> right3 <SPAN class="operator token">=</SPAN> <SPAN class="token function">Right</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>info_headline<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>right3 <SPAN class="operator token">==</SPAN> <SPAN class="string token">'Red'</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Warning - Red'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN> <SPAN class="keyword token">else</SPAN> <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>right3 <SPAN class="operator token">==</SPAN> <SPAN class="string token">'nge'</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Warning - Orange'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN> <SPAN class="keyword token">else</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Watch'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

You can also use a dictionary with the options:

<SPAN class="keyword token">var</SPAN> right3 <SPAN class="operator token">=</SPAN> <SPAN class="token function">Right</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>info_headline<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> dct <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'Red'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'Warning - Red'</SPAN><SPAN class="punctuation token">,</SPAN>
           <SPAN class="string token">'nge'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'Warning - Orange'</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="token function">HasKey</SPAN><SPAN class="punctuation token">(</SPAN>dct<SPAN class="punctuation token">,</SPAN> right3<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> dct<SPAN class="punctuation token">[</SPAN>right3<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN> <SPAN class="keyword token">else</SPAN> <SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Watch'</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

XanderBakker

Hi derek.phyn_WRC , since you answered your own question, can you mark your answer as the correct answer? Thanks, this will help other find the answer to similar questions more easily.

Doe mee aan het gesprek

Aangemelde leden kunnen berichten plaatsen, updates volgen en meer. Nieuw hier? Registreer een gratis account.

Snelle Links

Community Help
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.