Why Does \'Uncaught ReferenceError: function is not defined\' Occur with Onclick Attributes, and How Can I Fix It?

"Uncaught ReferenceError: function is not defined" with Onclick Attribute

Problem:

When clicking a button with an onclick attribute, the error "Uncaught ReferenceError: function is not defined" occurs.

Cause:

Userscripts run in an isolated environment where onclick operates within the target page's scope. Consequently, onclick cannot access functions defined in the userscript.

Solution:

Avoid using onclick and utilize addEventListener() instead. For instance:

emoteTab[2].innerHTML += '<span>

Updated Code:

for (i = 0; i < EmoteURLLines.length; i++) {
    if (checkIMG (EmoteURLLines[i])) {
        localStorage.setItem ("nameEmotes", JSON.stringify (EmoteNameLines));
        localStorage.setItem ("urlEmotes", JSON.stringify (EmoteURLLines));
        localStorage.setItem ("usageEmotes", JSON.stringify (EmoteUsageLines));
        if (i == 0) {
            console.log (resetSlot ());
        }
        emoteTab[2].innerHTML  += '<span>

var targetSpans = emoteTab[2].querySelectorAll ("span[data-usage]");
for (var J in targetSpans) {
    targetSpans[J].addEventListener ("click", appendEmote, false);
}

Additional Warnings:

• Avoid using the same ID for multiple elements (invalid).
• Be mindful that using innerHTML or outerHTML can overwrite event handlers on affected nodes.

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