If

When button is clicked, it loads specified url and puts loaded content to specified target element

<button type="button"
    data-as='{
        "click": {
            "if": {
                "arg": {
                    "true": null
                },
                "then": {
                    "html": {
                        "result": "Then part",
                        "target": "#target"
                    }
                }
            }
        }
    }'
>Then part</button>

<button type="button"
    data-as='{
        "click": {
            "if": {
                "arg": {
                    "false": null
                },
                "else": {
                    "html": {
                        "result": "Else part",
                        "target": "#target"
                    }
                }
            }
        }
    }'
>Then part</button>