You are loading the Javascript file in the <head>, before the body of your HTML Is loaded. Therefore your line Has nothing to look up – your button with class guessSubmit doesn’t exist yet. And since guessSubmit is null, it does not contain any properties, hence the error. The easiest solution is to put your … Read more
Scoping rules The main difference is scoping rules. Variables declared by var keyword are scoped to the immediate function body (hence the function scope) while let variables are scoped to the immediate enclosing block denoted by { } (hence the block scope).
What It Is This is an arrow function. Arrow functions are a short syntax, introduced by ECMAscript 6, that can be used similarly to the way you would use function expressions. In other words, you can often use them in place of expressions like function (foo) {…}. But they have some important differences. For example, they do … Read more
I’m using ArcGIS JSAPI 4.12 and wish to use Spatial Illusions to draw military symbols on a map. When I add milsymbol.js to the script, the console returns error Uncaught SyntaxError: Cannot use import statement outside a module` so I add type=”module” to the script, and then it returns Uncaught ReferenceError: ms is not defined … Read more