使用 Javascript 触发选择表单元素以显示其选项(打开下拉选项列表) [英] Trigger a select form element to show its options (open drop down options list) with Javascript

问题描述

这里是标记

<select id="person_prefix" name="prefix">
 <option value=""></option>
 <option value="Dr" selected="selected">Dr</option>
 <option value="Mr">Mr</option>
 <option value="Ms">Ms</option>
 <option value="Mrs">Mrs</option>
</select>

我想触发一个javascript事件，以便选项列表下拉.使用 jquery 我尝试了以下操作:

and I want to trigger a javascript event so that the option list drops down. Using jquery I've tried the following:

$("#person_prefix").click();
$("#person_prefix").mousedown();
$("#person_prefix").change();

但似乎没有任何效果.这是哪个事件，如何触发?

but nothing seems to work. Which event is this and how can be triggered?

谢谢

推荐答案

我曾经在寻找如何做同样的事情，但没有找到任何可行的解决方案，但后来我们 javascript 小组中的一个人提出了一个巧妙的解决方案.这是代码.

I was once searching how to do the same thing and didn't find any working solution but then a guy in our javascript group came with a clever work around. Here is the code.

HTML

<input type="button" id="show" value="show" />
<select id="myslect">
    <option>nothing</option>
    <option>something</option>
    <option>anything</option>
</select>

Javascript

$("#show").click(function () {
    var element = $("select")[0],
        worked = false;
    if(document.createEvent) { // chrome and safari
        var e = document.createEvent("MouseEvents");
        e.initMouseEvent("mousedown", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
        worked = element.dispatchEvent(e);
    }
    if(!worked) { // unknown browser / error
        alert("It didn't worked in your browser.");
    }
});

我不知道如何链接到群组帖子，以便您可以看到整个主题.无论如何都要归功于 CJ Madolara.干得好！

I'm not sure how to link to the group post so you can see the whole thread. Anyway credits to CJ Madolara. Good Job!

更新:仅适用于 Chrome 和 Safari

这篇关于使用 Javascript 触发选择表单元素以显示其选项(打开下拉选项列表)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！