I am looking to check if the Onevent javascript function returns true or false. My goal is to restrict the listener method call based on the return value of the Javascript function.
However, the code snippet provided is causing a syntax error in Firebug.
<f:ajax event="keyup" render="@form" onevent="return validatePageNumber(event);" listener="#{bean.listenerMethod}"/>
Can anyone assist with determining the return value and firing the listener method accordingly? Thank you in advance :)
The onevent attribute is used to specify a JS function reference name, rather than an entire JS script. The correct way to use the onevent attribute is
<f:ajax ... onevent="functionName" />
(yes, without parentheses!)
with
function functionName(data) {
alert(data.status); // Will show 3 times.
}
However, it may not be the most suitable tool for the intended purpose. The onevent attribute should only reference a listener function that will be called 3 times: before the ajax request is sent, after the ajax response is received, and after the HTML DOM is updated based on the ajax response. For real-world usage examples, you can refer to Proccess onclick function after ajax call <f:ajax> and Disable/enable commandbutton on ajax event.
Instead of using the onevent attribute, you can simply utilize the parent component's onXXX attribute (where XXX is the specific <f:ajax event> you wish to hook onto). For example, if it's an <h:inputText>:
<h:inputText ... onkeyup="return validatePageNumber(event)">
<f:ajax event="keyup" render="@form" />
</h:inputText>
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