How to do Listbox contraint/validation

asked 2013-02-21 18:51:48 +0800

cgunadi gravatar image cgunadi

updated 2013-02-21 20:23:00 +0800

What's the best way to put validation/constraints on a Listbox which is used in "select" mode (i.e: dropdown list) ?

Listbox doesn't have Constraint support like Textbox.

I want to check that the Listbox has a selected item other the first item (first item is empty space "").

I want to have popup error close to the Listbox similar to Textbox error popup.

Regards, cgunadi

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answered 2013-02-22 02:51:19 +0800

vincentjian gravatar image vincentjian
2245 6

Hi cgunadi,

You can override doBlur_ function in client side to show error message as follows:

        java.util.ArrayList list = new java.util.ArrayList();
        list.add("option 1");
        list.add("option 2");
        list.add("option 3");
        org.zkoss.zul.ListModelList model = new org.zkoss.zul.ListModelList(list);
    <listbox mold="select" model="${model}" xmlns:w="client">
        <attribute w:name="doBlur_"><![CDATA[
            function(evt) {
                if (this.$n().value == '') {
                    zAu.wrongValue_(this, 'Please select.....');
                } else {
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Asked: 2013-02-21 18:51:48 +0800

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Last updated: Feb 22 '13

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