Get widgetVar with JavaScript or check/uncheck all other PrimeFaces checkboxes
I have several PrimeFaces checkboxes on a page. If you click the master checkbox, all other checkboxes should be checked/unchecked. With plain HTML checkboxes this would be an easy issue. But because PrimeFaces does not show the checkbox itself, but an image, the following JavaScript code does not work:
<script type="text/javascript">
$(document).ready(function() {
var masterCheckbox = $(".ui-chkbox.master :checkbox");
var slaveCheckboxes = $(".ui-chkbox:not(.master) :checkbox");
updateMaster();
masterCheckbox.change(updateSlaves);
slaveCheckboxes.change(updateMaster);
function updateMaster() {
var allSlavesChecked = true;
slaveCheckboxes.each(function() {
if (!$(this).is(':checked')) {
allSlavesChecked = false;
}
});
masterCheckbox.attr("checked", allSlavesChecked);
}
function updateSlaves() {
var masterChecked = masterCheckbox.is(":checked");
slaveCheckboxes.each(function() {
$(this).attr("checked", masterChecked);
});
}
});
</script>
I know that I could use the PrimeFaces widgetVar to toggle the checkboxes, but I do not know how to get the PrimeFaces widget objects with JavaScript. I think RichFaces adds the component property to the DOM element, but PrimeFaces does not. Does somebody know a solution for this problem?
You were correct -- if you create your component like this:
<p:selectBooleanCheckbox value="val" widgetVar="myCheckbox"/>
You can access the checkbox simply by refering to its widgetVar, in this case calling the PrimeFaces client-side API to mark it as checked:
<script>
myCheckbox.check();
</script>
You could then tie the onchange event of your master checkbox to a javascript method that checked or unchecked the state of all the "slave" checkboxes depending on the state of the master checkbox (would suggest you store the state in a hidden field).
Note, it may make your life easier to instead handle the "change" ajax event and implement the check/uncheck logic on the server side. Just make sure that you provide all the ids of all the slave checkboxes in the update attribute of the p:ajax component:
<p:selectBooleanCheckbox id="masterChkBox" ...>
<p:ajax event="change" listener="#{yourBean.handleMasterChange}" update="...all slavecheckbox ids..."/>
</p:selectBooleanCheckbox>