显示/隐藏使用下拉列表 [英] Show/Hide using drop down list

问题描述

您好，我正在尝试使用以下代码.我喜欢该代码，但我希望默认值为DIV Area1.在下拉菜单中有显示DIV Area 1的HTML代码，但我希望Javascript默认显示DIV Area 1.代码是什么?

Hello I am trying to use this code below. I like the code but I want the default to be DIV Area 1. I have the HTML code showing DIV Area 1 in the drop down menu but I want the Javascript to show DIV AREA 1 by default. What would be the code?

    <script type="text/javascript">
    $(document).ready(function(){
        $('.box').hide();
        $('#dropdown').change(function() {
            $('.box').hide();
            $('#div' + $('#dropdown').val()).show();
        });
    });
</script>

<form>
    <select id="dropdown" name="dropdown">
     <option value="0">Choose</option>
     <option value="area1" selected="selected">DIV Area 1</option>
     <option value="area2">DIV Area 2</option>
     <option value="area3">DIV Area 3</option>
    </select>
</form>

<div id="divarea1" class="box">DIV Area 1</div>
<div id="divarea2" class="box">DIV Area 2</div>
<div id="divarea3" class="box">DIV Area 3</div>

推荐答案

$('.box').hide().first().show();

或者:

$('.box').hide().filter("#divarea1").show(); 

实时演示

将以上内容之一放入DOM ready事件:

Put one of the above in the DOM ready event:

$(function(){ /*...*/ });

或

$(document).ready(function(){ /* ... */ });

完整代码:(它应该回答您有关如何显示所选格的下一个问题...)

Full code: (It should answer you next question regarding how to show the selected div...)

$(document).ready(function() {

    $('.box').hide().filter("#divarea1").show();

    $('#dropdown').change(function() {
        var selectedId= $(this).find(':selected').text().replace(/\s/g, "").toLowerCase();
        console.log(selectedId);
        $('.box').hide().filter('#' + selectedId).show();
    });
});​

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