jQuery显示和隐藏div

Question

I have a form with a yes|no question displayed by radio selectors. I have two divs each one containing different drop downs based on the yes|no response. I cannot figure out how to show one and hide the other.

jsFiddle of this code

    $(document).ready(function(){   
    $("input[name=radio_button]").change(function() {
        var test1= $(this).val();                   
        $("#"+test1).show();
        $("div.test2").hide();  
    }); 
    $("input[name=radio_button]").select(function() {
        var test2= $(this).val();       
        $("#"+test2).show();
        $("div.test1").hide();
    }); 
}); 

<p>
        <label class="required">&nbsp;</label>
        Yes <input name="radio_button" id="radio_button" type="radio" value="test2" onChange="" />&nbsp;&nbsp;&nbsp;
        No <input name="radio_button" id="radio_button" type="radio" value="test1" />
    </p>     
<p>
    <label class="required">Device: </label><br />
    <div id="test1" class="test1_div">
    <label style="font-weight:600;">test1</label>
        <select name="order.item" id="item" >
          <option value="default">Please Select item</option> 
        </select>
</div>
<div id="test2" class="test2_div">
<label style="font-weight:600;">item2</label>
        <select name="order.item" id="device">
          <option value="default">Please Select Device</option>             
        </select>
</div> 
</p>

Answer 1

Assuming your markup (html) is correct, try the following. It binds to click-events of those radio buttons (both of them), always hides both divs first, and then shows the appropiate div only (the one that belongs to the radio button clicked).

$(document).ready(function(){   
    $("input[name=radio_button]").click(function() {
        var test= $(this).val();    

        $("div.test1, div.test2").hide(); //Hide both divs
        $("#"+test).show();
    }); 
}); 

Answer 2

To make one hidden and other visible , you have to first hide both the blocks then add show() on the block you want to see. This will work for you.