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POClient side validation using javascript with JSF
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  1. POClient side validation using javascript with JSF
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    copied!<p>I'm using JSF 2.0 and PrimeFaces library. I have a page with several inputs (among them there are 2 p:calendar components). I want to validate that the second date is not before the first date, but I want this validation to happen in the client, and if validation fails, then don't submit the form and display the h:message that belong to the calendars. PrimeFaces' calendar has a minDate attribute, but this just works not allowing to choose a previous date using the graphical calendar, but you can still type a previous date and validation passes; so I have to use javascript too. I can add a "onclick" event to the commandButon to call js function that performs validation, but how can I stop JSF from submitting the form is javascript validation failed? and how can I display the h:message components? I want to avoid going to the server. Thanks!</p> <p>This is the code of the calendars:</p> <pre><code>&lt;p:calendar id="dateFrom" value="#{reqAbsences.dateFrom}" navigator="true" showOn="button" required="true" pattern="dd/MM/yyyy" onSelectUpdate="dateTo dateFromVal hourInput timeFrom timeTo" selectListener="#{reqAbsences.handleDateFromSelect}" mindate="#{reqAbsences.today}" &gt; &lt;f:validator validatorId="DateValidator"/&gt; &lt;/p:calendar&gt; &lt;p:message id="dateFromVal" for="dateFrom" showSummary="false"/&gt; &lt;h:outputLabel value="#{text['global.toDate']}"/&gt; &lt;p:calendar id="dateTo" value="#{reqAbsences.dateTo}" navigator="true" showOn="button" onSelectUpdate="dateToVal" selectListener="#{reqAbsences.handleDateToSelect}" pattern="dd/MM/yyyy" required="true" mindate="#{reqAbsences.dateFrom}"&gt; &lt;f:validator validatorId="DateValidator"/&gt; &lt;/p:calendar&gt; &lt;p:message id="dateToVal" for="dateTo" showSummary="false"/&gt; </code></pre>
 

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