After performing a replacement, the appendChild() method may not function as expected

Currently, I am delving into the world of creating a Firefox extension. Although I have never ventured into extension development before and my grasp on JS/JSON/XML is limited, the ever-present Google is there to lend a hand. This block of code is designed to display every "sName" element within the JSON object:

for(var i=0; i<obj.names.length; i++)
{
    var nameItem = createListItem(obj.names[i].sName);
    lb.appendChild(nameItem);
}

One challenge I am facing is replacing any empty spaces in a name with an underscore.

    nameItem = nameItem.replace(/ /g,"_");

Upon inserting the "var nameItem =" line, the printing of all names ceases abruptly, and

    var nameItem = createListItem(obj.names[i].sName).replace(/ /g, "_");

resulted in the same undesirable outcome.

Answer â„–1

Assuming that the variable sName is a string, this code should function as intended:

var nameItem = createListItem(obj.names[i].sName.replace(/ /g, "_"));

Update:

The replace method is specifically for manipulating string values, not objects in general. If you try to call an undefined method on an object, it will result in an error and halt the execution of your code. This appears to be what's happening in this particular section.

I don't have visibility into the inner workings of the createListItem function, but it likely expects a string as input and returns an object—probably of type Element since it's being added to the DOM (keep in mind you can't directly append strings!). Since Elements do not have a replace method, the execution stops at the point where replace is called.

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