Shiny: dynamic default value for textInput
<p>I see that <code>textInput</code> has a default value field. However, I can't seem to figure out how to dynamically set the default value field. Lets say I have a <code>selectInput</code>, I want the default value of my <code>textInput</code> to be the value selected in <code>selectInput</code> but with some text appended to it, which the user can freely edit.</p>

<p>On the <code>ui</code> side where I have the <code>textInput</code> I obviously can't do anything like <code>value=paste0(output$selectName,"_someText")</code> because I can't use <code>output</code>.</p>

<p>I'm guessing the answer involves some code on the <code>server</code> side that updates the <code>textInput</code>. I can't seem to figure how to get <code>updateTextInput</code> to do what I want, even though it sounds like what I want. Any advice on dynamically generating a default value for a <code>textInput</code> would be appreciated.</p>

<p>Regards</p>