MonkeyPatching: PrimeFaces widgets extend/override

问题

I'm currently using (it's working fine)

PrimeFaces.widget.OverlayPanel.prototype._old_init = PrimeFaces.widget.OverlayPanel.prototype.init;
PrimeFaces.widget.OverlayPanel.prototype.init = function(cfg) 
{
    this._old_init(cfg);
    this.align();
}

but I'd like to use something more readable and 'jQuery-ish' like this completely invented unrealistic code:

PrimeFaces.widget.OverlayPanel.patch(
{
    init: function(cfg) 
    {
        super.init(cfg);
        this.align();
    },

    show: function()
    {
        console.log('blah blah blah');
        super.show();
    }
});

I tried PrimeFaces.widget.Xxx.extend({...}) but in this case I have no access to super methods.

Please, keep in mind that I'm totally dumb with Javascript

Thanks

回答1:

I've achieved it:

if(PrimeFaces.widget.OverlayPanel)
{
    PrimeFaces.widget.OverlayPanel = PrimeFaces.widget.OverlayPanel.extend(
    {
        init: function(cfg) 
        {
            this._super(cfg);
            this.align();
        },

        show: function()
        {
            console.log('blah blah blah');
            this._super();
        }
    });
};

this is stored inside

app
- resources
  - js
    - pf-patches.js

and it's used in global template:

<!DOCTYPE html>
<html lang="#{userBean.locale.language}" xmlns="http://www.w3.org/1999/xhtml" 
    xmlns:ui="http://xmlns.jcp.org/jsf/facelets" xmlns:h="http://xmlns.jcp.org/jsf/html"
    xmlns:f="http://xmlns.jcp.org/jsf/core" xmlns:cc="http://xmlns.jcp.org/jsf/composite"
    xmlns:c="http://xmlns.jcp.org/jsp/jstl/core" xmlns:fn="http://xmlns.jcp.org/jsp/jstl/functions"
    xmlns:p="http://primefaces.org/ui" xmlns:pe="http://primefaces.org/ui/extensions"
    xmlns:o="http://omnifaces.org/ui" xmlns:of="http://omnifaces.org/functions"
    xmlns:s="http://shapeitalia.com/jsf2" xmlns:sc="http://xmlns.jcp.org/jsf/composite/shape"
    xmlns:e="http://java.sun.com/jsf/composite/cc" xmlns:et="http://shapeitalia.com/edea2"
    xmlns:pt="http://xmlns.jcp.org/jsf/passthrough">

<f:view locale="#{userBean.locale}" contentType="text/html">
    <h:head>
        <f:facet name="first">
            <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />
            <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
            <title><ui:insert name="title">#{navigatorBean.viewTitle}</ui:insert></title>
            <link rel="shortcut icon" type="image/x-icon" href="#{resource['favicon/favicon.ico']}" />
        </f:facet>

        <f:facet name="last">
==========> <h:outputScript name="js/pf-patches.js" /> <==========
            <h:outputScript library="omnifaces" name="fixviewstate.js" />
        </f:facet>
    </h:head>

    <h:body>
        <h:outputStylesheet name="theme/custom.css" />
        <h:outputStylesheet name="theme/other-icons.css" />

        ...

回答2:

I had the same problem, but you're solution was not 100% efficient to my problem (See here https://github.com/primefaces/primefaces/issues/1928)) since you're willing to call _super() from OverlayPanel, and I'm trying to avoid it (it does few things I did not want to). So what I did is this:

/* Quick fix so layout might be handled in dialog component PF #1928 */
if(PrimeFaces.widget.Layout) {
    PrimeFaces.widget.Layout.prototype.init = function(cfg) {
        // skip calling PrimeFaces.widget.Layout.init() on purpose
        PrimeFaces.widget.DeferredWidget.prototype.init.call(this, cfg);

        this.cfg = cfg;
        this.id = this.cfg.id;
        this.jqId = PrimeFaces.escapeClientId(this.id);

        if(this.cfg.full) {          //full
            var dialog = $(this.cfg.center.paneSelector).parents('.ui-dialog-content');
            if(dialog) {             // full + dialog
                this.jq = dialog;
            } else {
                this.jq = $('body');
            }
        } else if(this.cfg.parent) { //nested
            this.jq = $(PrimeFaces.escapeClientId(this.cfg.parent));
        } else {                     //element
            this.jq = $(this.jqId);
        }

        this.renderDeferred();
    }
}

That way init() is completely overrided. I hope it will help few folks out there in this atypical case ;)

来源：https://stackoverflow.com/questions/36594082/monkeypatching-primefaces-widgets-extend-override

标签

javascript

jquery

jsf

primefaces

monkeypatching