我如何为jQuery做一个switch case?

时间:2013-04-22 05:23:46

标签: jquery if-statement switch-statement

我有这个if-else语句给了我奇怪的回应......每当我首先选择“输出”时,之后没有其他选择会出现...... 仅供参考,我使用多选,因此我可以选择并显示我想要的数量。

 $('#outputText').hide();
    $('#armCB').hide();
    $('#outputCB').hide();
    $('#zoneText').hide();
    $('#counterText').hide();
    $('#flagText').hide();
    $('#sensorText').hide();

('#select-choice-1').change(function(){
        if ($('#output').is(':selected')){
            $('#outputText').show();
        }
        else if ($('#arm').is(':selected')){
            $('#armCB').show();
        }
        else if ($('#zone').is(':selected')){
            $('#zoneText').show();
        }
        else if ($('#counter').is(':selected')){
            $('#counterText').show();
        }
        else if ($('#flag').is(':selected')){
            $('#flagText').show();
        }
        else if ($('#sensor').is(':selected')){
            $('#sensorText').show();
        }
        else{
            $('#outputText').hide();
            $('#armCB').hide();
            $('#zoneText').hide();
            $('#counterText').hide();
            $('#flagText').hide();
            $('#sensorText').hide();

        }

我的if-else声明中有错误吗?或者我必须在这里使用Switch case语句吗?如果是这样,我该怎么做?

HTML:

<div id="display" style=" clear:both">
        <div class="left" style="float:left; width:48%">
        <div data-role="fieldcontain">
            <label for="select-choice-1" class="select">Select Category</label>
            <select name="select-choice-1" id="select-choice-1" data-native-menu="false" data-mini="true" multiple="multiple" size="2">

                <option value="arm" id="arm">Arm</option>
                <option value="zone" id="zone">Zone Input</option>
                <option value="output" id="output">Output</option>
                <option value="counter" id="counter">Counter</option>
                <option value="flag" id="flag">Flag</option>
                <option value="sensor" id="sensor">Sensor</option>
            </select>
        </div>



        </div>
        <div class="right" style=" float: right; width:48%">
             <div id="armCB">
                <fieldset data-role="controlgroup">
                    <legend>Unit</legend>
                    <input type="checkbox" class="CB" name="armCB_1" id="armCB_1" class="custom" data-mini="true" />
                    <label for="armCB_1">Arming Status</label>
                </fieldset>
             </div>

            <div id="outputText">
                <p> Please enter an Output number and press "Add" button: </p>
                <input style="background: white; color: black;" type="text" id="outputTextInput" value="">
                <input type="submit" id="outputAdd" value="Add"/>
                <input type="submit" id="outputRemove" value="Remove"/>
            </div>
            <div id="zoneText">
                <p> Please enter a Zone number and press "Add" button: </p>
                <input style="background: white; color: black;" type="text" id="zoneTextInput" value="">
                <input type="submit" id="zoneAdd" value="Add"/>
                <input type="submit" id="zoneRemove" value="Remove"/>
            </div>
            <div id="counterText">
                <p> Please enter a counter number and press "Add" button: </p>
                <input style="background: white; color: black;" type="text" id="counterTextInput" value="">
                <input type="submit" id="counterAdd" value="Add"/>
                <input type="submit" id="counterRemove" value="Remove"/>
            </div>
            <div id="flagText">
                <p> Please enter a Flag number and press "Add" button: </p>
                <input style="background: white; color: black;" type="text" id="flagTextInput" value="">
                <input type="submit" id="flagAdd" value="Add"/>
                <input type="submit" id="flagRemove" value="Remove"/>
            </div>
            <div id="sensorText">
                <p> Please enter a Sensor number and press "Add" button: </p>
                <input style="background: white; color: black;" type="text" id="sensorTextInput" value="">
                <input type="submit" id="sensorAdd" value="Add"/>
                <input type="submit" id="sensorRemove" value="Remove"/>
            </div>
        </div>
    </div>

4 个答案:

答案 0 :(得分:15)

那只是标准的javascript: http://www.w3schools.com/js/js_switch.asp

switch(n) {
 case 1:
  //execute code block 1
  break;
 case 2:
  //execute code block 2
  break;
 default:
 // code to be executed if n is different from case 1 and 2
}                           

其中switch变量将是所选标记的名称

答案 1 :(得分:5)

在这种情况下,您不需要switch语句,您可以使用所选选项的当前值或id来选择目标元素:

$('#select-choice-1').change(function(){
    $('.elements').hide();
    $('#' + this.value + 'Text').show();
});

<强>更新 当您对select元素使用多个属性时,可以使用jQuery val方法,它返回一个选定选项的数组,然后您可以根据所选值创建一个选择器。

$('#select-choice-1').change(function(){
    $('div.right > div').hide();
    var selector = '#' + $(this).val().join('Text, #') + 'Text';
    $(selector).show();
});

http://jsfiddle.net/3AbJq/

答案 2 :(得分:1)

没有 JQuery Switch 语句。如果你想使用switch语句,你可以参考Javascript Switch。

Switch

这是我的方法。我将为#select-choice-1中的每个选项添加一个数据部分属性,它将具有相应div的id。

$('#select-choice-1').change(function(){
        $('#outputText').hide();
        $('#armCB').hide();
        $('#zoneText').hide();
        $('#counterText').hide();
        $('#flagText').hide();
        $('#sensorText').hide();

    //the above hide() methods can be removed if you can
    //add a class for all of these sections and say $('.sectionDivs').hide()
    var divId = $(':selected',this).data('section');
    $('#' + divId ).show();
  
    }

答案 3 :(得分:1)

如果是多选,请不要使用else if

$('#select-choice-1').change(function() {
    $('#outputText').hide();
    $('#armCB').hide();
    $('#zoneText').hide();
    $('#counterText').hide();
    $('#flagText').hide();
    $('#sensorText').hide();

    if ($('#output').is(':selected')) {
        $('#outputText').show();
    }
    if ($('#arm').is(':selected')) {
        $('#armCB').show();
    }
    if ($('#zone').is(':selected')) {
        $('#zoneText').show();
    }
    if ($('#counter').is(':selected')) {
        $('#counterText').show();
    }
    if ($('#flag').is(':selected')) {
        $('#flagText').show();
    }
    if ($('#sensor').is(':selected')) {
        $('#sensorText').show();
    }
});

演示:Fiddle

如果您可以对标记进行一些更改

,可以将其简化为如下所示
$(function(){

    var $ctitems = $('#select-choice-1-items');
    var $items = $('.item', $ctitems).hide();

    $('#select-choice-1').change(function(){
        $items.hide()
        $('option:selected',this).each(function(){
            var id = $(this).attr('id');
            $('#' + id + 'Item').show()
        });
    });
});

HTML

<div id="display" style=" clear:both">
    <div class="left" style="float:left; width:48%">
        <div data-role="fieldcontain">
            <label for="select-choice-1" class="select">Select Category</label>
            <select name="select-choice-1" id="select-choice-1" data-native-menu="false" data-mini="true" multiple="multiple" size="2">
                <option value="arm" id="arm">Arm</option>
                <option value="zone" id="zone">Zone Input</option>
                <option value="output" id="output">Output</option>
                <option value="counter" id="counter">Counter</option>
                <option value="flag" id="flag">Flag</option>
                <option value="sensor" id="sensor">Sensor</option>
            </select>
        </div>
    </div>

    <div id="select-choice-1-items" class="right" style=" float: right; width:48%">
        <div id="armItem" class="item">
            <fieldset data-role="controlgroup">
                <legend>Unit</legend>
                <input type="checkbox" class="CB" name="armCB_1" id="armCB_1" class="custom" data-mini="true" />
                <label for="armCB_1">Arming Status</label>
            </fieldset>
        </div>

        <div id="outputItem" class="item">
            <p> Please enter an Output number and press "Add" button: </p>
            <input style="background: white; color: black;" type="text" id="outputTextInput" value=""/>
            <input type="submit" id="outputAdd" value="Add"/>
            <input type="submit" id="outputRemove" value="Remove"/>
        </div>
        <div id="zoneItem" class="item">
            <p> Please enter a Zone number and press "Add" button: </p>
            <input style="background: white; color: black;" type="text" id="zoneTextInput" value=""/>
            <input type="submit" id="zoneAdd" value="Add"/>
            <input type="submit" id="zoneRemove" value="Remove"/>
        </div>
        <div id="counterItem" class="item">
            <p> Please enter a counter number and press "Add" button: </p>
            <input style="background: white; color: black;" type="text" id="counterTextInput" value=""/>
            <input type="submit" id="counterAdd" value="Add"/>
            <input type="submit" id="counterRemove" value="Remove"/>
        </div>
        <div id="flagItem" class="item">
            <p> Please enter a Flag number and press "Add" button: </p>
            <input style="background: white; color: black;" type="text" id="flagTextInput" value=""/>
            <input type="submit" id="flagAdd" value="Add"/>
            <input type="submit" id="flagRemove" value="Remove"/>
        </div>
        <div id="sensorItem" class="item">
            <p> Please enter a Sensor number and press "Add" button: </p>
            <input style="background: white; color: black;" type="text" id="sensorTextInput" value=""/>
            <input type="submit" id="sensorAdd" value="Add"/>
            <input type="submit" id="sensorRemove" value="Remove"/>
        </div>
    </div>
</div>

演示:Fiddle