This example shows how to set the width of ComboTree to a percentage of its parent container.
<div class="easyui-panel" style="width:100%;max-width:400px;padding:30px 60px;">
<div style="margin-bottom:20px">
<input class="easyui-combotree" style="width:100%" data-options="
url:'examples/combotree/tree_data1.json',
method:'get',
label:'width: 100%',
labelPosition:'top'
">
</div>
<div style="margin-bottom:20px">
<input class="easyui-combotree" style="width:80%" data-options="
url:'examples/combotree/tree_data1.json',
method:'get',
label:'width: 80%',
labelPosition:'top'
">
</div>
</div>