从复合组件执行JavaScript [英] Execute JavaScript from a Composite Component

问题描述

早上好，我有一个困扰我几个小时的问题.非常简单.呈现复合组件时，我尝试调用/执行JavaScript.就像您可以使用html标签正文和onload一样.

Good day, I have a problem that has annoyed me for a couple of hours now. It's very straight forward. I try to invoke/execute a JavaScript when the composite component is rendered. Like what you can do with the html tag body and onload.

如何引用要执行的嵌入式JavaScript?

How can I reference the in-line JavaScript to be executed ?

<cc:implementation>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false" />
    <div id="#{cc.clientId}" >

        <div id="map_canvas" style="width: 850px; height: 350px; padding: 1px; border: darkblue" />

        <script>init();</script>

        <script type="text/javascript">
            var map = null;
            function init() {
                var latlng = new google.maps.LatLng(51.5001524, -0.12623619);
                var myOptions = {
                    zoom: 7,
                    center: latlng,
                    mapTypeId: google.maps.MapTypeId.ROADMAP
                };
                map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
            }
        </script>
    </div>
    </cc:implementation>

我已经尝试过this.init()，#{cc.clientId} .init()，但是在上下文中找不到JS.如果我从JSF/ajax组件执行它，则只需使用"init();"就可以正常工作.

I have tried with this.init() , #{cc.clientId}.init() .But the JS can't be found in the context. If I execute it from a JSF/ajax component it works fine with just "init();"

推荐答案

您正在调用init() 之前，该函数已定义.

You're calling init() before the function has been definied.

将调用放在函数定义之后.

Put the call after the function definition.

<script type="text/javascript">
    var map = null;
    function init() {
        var latlng = new google.maps.LatLng(51.5001524, -0.12623619);
        var myOptions = {
            zoom: 7,
            center: latlng,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    }
</script>
<script>init();</script>

或者只是摆脱函数调用，而直接执行它.在定义了<div id="map_canvas">之后，它就可以执行了.

Or just get rid of the function call and just execute it directly. It'll just work as it's been executed after <div id="map_canvas"> has been definied.

<script type="text/javascript">
    var map = null;
    var latlng = new google.maps.LatLng(51.5001524, -0.12623619);
    var myOptions = {
        zoom: 7,
        center: latlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
</script>

---

不相关与具体问题:复合组件中还有另一个设计缺陷.在同一视图中，此组件不能重复使用一次.您最终将在HTML中使用多个<div id="map_canvas">元素.在HTML中具有多个具有相同id的元素是非法的.相应地修复它:

---

Unrelated to the concrete problem: you've another design flaw in your composite component. This component cannot be reused more than once in the same view. You would end up with multiple <div id="map_canvas"> elements in the HTML. Having multiple elements with the same id in HTML is illegal. Fix it accordingly:

<div id="#{cc.clientId}_map_canvas" ...>

和

... document.getElementById("#{cc.clientId}_map_canvas") ...

这篇关于从复合组件执行JavaScript的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！