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

[MelissaMitchell]

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!

[MelissaMitchell · Accepted solution]

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";