ArcGIS Online Webmap Pop-up - Attribute Expression Code not working

MelissaMitchell — Thu, 25 Jun 2026 13:41:26 GMT

Hello,

I've created an attribute expression that looks at a field to see if there is a url. If there is no url, do not show "Click Here". If there is a url, show Click Here to view project details.

I can get the field to show the url if I take out the html code. Once I add the html code I don't see anything.

var link = $feature.Project_Li;

if (IsEmpty(link)){

return null;

}else {

return '<a href="' + link + '">Click Here</a>';

}

I also tried this code, so if link (attribute) is null you wouldn't see "Click Here". And in the HTML in the popup I did the <a href="Project_Li">AttributeExpression</a>. Click here still shows up even if it's null.

var link = $feature.Project_Li;

if (IsEmpty(link)){

return " ";

}

return "Click Here";

Thank you in advance for the help!

Re: ArcGIS Online Webmap Pop-up - Attribute Expression Code not working

MelissaMitchell — Thu, 25 Jun 2026 14:07:08 GMT

I figured it out!!!! I had to clean the attribute. I covered all the nulls.

var link = $feature.Project_Li;

var cleanURL = Trim(Text(link));

if (

IsEmpty(link) ||

CleanURL == "" ||

Lower(CleanURL) == "null" ||

Lower(CleanURL) == "<null>" ||

Lower(CleanURL) == "none"

) {

return "";

}

return "Click Here";

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ArcGIS Online Webmap Pop-up - Attribute Expression Code not working

Re: ArcGIS Online Webmap Pop-up - Attribute Expression Code not working