knockout.js - How to data-bind "mousedown" instead of "click" on an HTML button? -

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i have following button using data-bind="click: ..." , wondering if @ possible use "mousedown" instead of "click". 

<span style="cursor:pointer" class="button button--sm" data-bind="click: setversion9, css: { 'button--primary': isversion9selected()  }">code version 9</span>

currently when clicking ui button, if press , release of mouse button happens quickly, causes problems switching between text boxes (ie: copies text 1 box on next one). hoping using "mousedown" resolve issue wouldn't have worry clicking button fast.

you can use event binding events don't have first-class-citizen binding as described here.

<span style="cursor:pointer" class="button button--sm"      data-bind="event: { mousedown: setversion9 }, css: { 'button--primary': isversion9selected()  }">code version 9</span>

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