JavaScript控制两个列表框listbox左右交换数据的方法

本文实例讲述了JavaScript控制两个列表框listbox左右交换数据的方法。分享给大家供大家参考。具体分析如下：

这个功能我们经常用到，将左边列表框的元素移动到右边，或者将右边列表框的元素移动到左边，可以一次性全部移动

function listbox_moveacross(sourceID, destID) {

    var src = document.getElementById(sourceID);

    var dest = document.getElementById(destID);

    for(var count=0; count < src.options.length; count++) {

        if(src.options[count].selected == true) {

                var option = src.options[count];

                var newOption = document.createElement("option");

                newOption.value = option.value;

                newOption.text = option.text;

                newOption.selected = true;

                try {

                         dest.add(newOption, null); //Standard

                         src.remove(count, null);

                 }catch(error) {

                         dest.add(newOption); // IE only

                         src.remove(count);

                 }

                count--;

        }

    }

}

//..

listbox_moveacross('countryList', 'selectedCountryList');

Click below buttons to move selected options right or left.<br>

<table>

<tbody><tr>

    <td>

<select id="sourceSelect" size="10" multiple="">

 <option value="a">Afghanistan</option>

 <option value="b">Bahamas</option>

 <option value="c">Barbados</option>

 <option value="d">Belgium</option>

 <option value="e">Bhutan</option>

 <option value="f">China</option>

 <option value="g">Croatia</option>

 <option value="h">Denmark</option>

 <option value="i">France</option>

</select>

    </td>

    <td>

        <button onclick="listboxMoveacross('sourceSelect', 'destSelect');">&gt;&gt;</button>  <br>

        <button onclick="listboxMoveacross('destSelect', 'sourceSelect');">&lt;&lt;</button>

    </td>

    <td>

<select id="destSelect" size="10" multiple="">

 <option value="a">Afghanistan</option>

 <option value="b">Bahamas</option>

 <option value="c">Barbados</option>

 <option value="d">Belgium</option>

 <option value="e">Bhutan</option>

 <option value="f">China</option>

 <option value="g">Croatia</option>

 <option value="h">Denmark</option>

 <option value="i">France</option>

</select>

    </td>

</tr>

</tbody></table>

    <script>

function listboxMoveacross(sourceID, destID) {

    var src = document.getElementById(sourceID);

    var dest = document.getElementById(destID);

    for(var count=0; count < src.options.length; count++) {

        if(src.options[count].selected == true) {

                var option = src.options[count];

                var newOption = document.createElement("option");

                newOption.value = option.value;

                newOption.text = option.text;

                newOption.selected = true;

                try {

                         dest.add(newOption, null); //Standard

                         src.remove(count, null);

                 }catch(error) {

                         dest.add(newOption); // IE only

                         src.remove(count);

                 }

                count--;

        }

    }

}

</script>

希望本文所述对大家的javascript程序设计有所帮助。