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All of the roslibjs calls are asynchronous; they are event driven. When you call 'get', you are passing in a callback function that will be called whenever rosbridge responds to you request. This prevents blocking and waiting which will lock up the entire browser. You could move your var formElement = document.getElementById('maxLinearSpeedDisplay'); formElement.innerHTML = maxLinearSpeed; inside your callback function so that the HTML is updated whenever a response comes back.