Dynamic username on dashboard welcome message

I think your code should work if you add a couple pieces:

widget.on('ready', function(){
	
	var eleExists = document.getElementById("myPara");
    if(!eleExists){
       	const para = document.createElement("p");
		para.setAttribute("id", "myPara");
		const node = document.createTextNode("Welcome " + prism.user.firstName + "!");
		para.appendChild(node);
		const element = document.getElementById("editor-3");
		element.appendChild(para);
    }
})

It adds an id to your paragraph element and first checks to make sure that id doesn't exist before adding a new paragraph & text.

cglowe You can also play with blox to get the desired effect.

Blox:

{
    "style": "",
    "script": "",
    "title": "",
    "showCarousel": true,
    "body": [
        {
            "type": "Container",
            "items": [
                {
                    "type": "ColumnSet",
                    "columns": [
                        {
                            "type": "Column",
                            "width": "50%",
                            "items": [
                                {
                                    "type": "TextBlock",
                                    "text": "❤️️ Welcome ️",
                                    "style": {
                                        "text-align": "center",
                                        "font-weight": "bold",
                                        "font-size": "24px",
                                        "margin-top": "50px",
                                        "margin-bottom": "50px",
                                        "margin-left": "50%",
                                        "text-aligment": "right"
                                    }
                                }
                            ]
                        },
                        {
                            "type": "Column",
                            "width": "30%",
                            "items": [
                                {
                                    "type": "TextBlock",
                                    "text": "️test",
                                    "id": "myUser",
                                    "style": {
                                        "text-align": "center",
                                        "font-weight": "bold",
                                        "font-size": "24px",
                                        "margin-top": "50px",
                                        "margin-bottom": "50px",
                                        "margin-left": "-70%",
                                        "color": "blue"
                                    }
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ],
    "actions": []
}

widget script:

widget.on("ready", function (w, args) {
$("#myUser").text(prism.user.firstName + ' ' + prism.user.lastName)
})

This is just simple example but within column set you can put any TextBlock/data you want (static text, data from elasticube etc).