Javascript 操作select控件大全 - zzwind's Blog

Javascript 操作select控件大全

zzwind posted @ 2010年7月13日 18:10 in JavaScript , 1046 阅读

 1判断select选项中 是否存在Value="paraValue"的Item 

 2向select选项中 加入一个Item 
 3从select选项中 删除一个Item 
 4删除select中选中的项 
 5修改select选项中 value="paraValue"的text为"paraText" 
 6设置select中text="paraText"的第一个Item为选中 
 7设置select中value="paraValue"的Item为选中 
 8得到select的当前选中项的value 
 9得到select的当前选中项的text 
10得到select的当前选中项的Index 

 

js 代码
// 1.判断select选项中 是否存在Value="paraValue"的Item        
function jsSelectIsExitItem(objSelect, objItemValue) {        
    var isExit = false;        
    for (var i = 0; i < objSelect.options.length; i++) {        
        if (objSelect.options[i].value == objItemValue) {        
            isExit = true;        
            break;        
        }        
    }        
    return isExit;        
}         
   
// 2.向select选项中 加入一个Item        
function jsAddItemToSelect(objSelect, objItemText, objItemValue) {        
    //判断是否存在        
    if (jsSelectIsExitItem(objSelect, objItemValue)) {        
        alert("该Item的Value值已经存在");        
    } else {        
        var varItem = new Option(objItemText, objItemValue);      
        objSelect.options.add(varItem);     
        alert("成功加入");     
    }        
}        
   
// 3.从select选项中 删除一个Item        
function jsRemoveItemFromSelect(objSelect, objItemValue) {        
    //判断是否存在        
    if (jsSelectIsExitItem(objSelect, objItemValue)) {        
        for (var i = 0; i < objSelect.options.length; i++) {        
            if (objSelect.options[i].value == objItemValue) {        
                objSelect.options.remove(i);        
                break;        
            }        
        }        
        alert("成功删除");        
    } else {        
        alert("该select中 不存在该项");        
    }        
}    
   
   
// 4.删除select中选中的项    
function jsRemoveSelectedItemFromSelect(objSelect) {        
    var length = objSelect.options.length - 1;    
    for(var i = length; i >= 0; i--){    
        if(objSelect[i].selected == true){    
            objSelect.options[i] = null;    
        }    
    }    
}      
   
// 5.修改select选项中 value="paraValue"的text为"paraText"        
function jsUpdateItemToSelect(objSelect, objItemText, objItemValue) {        
    //判断是否存在        
    if (jsSelectIsExitItem(objSelect, objItemValue)) {        
        for (var i = 0; i < objSelect.options.length; i++) {        
            if (objSelect.options[i].value == objItemValue) {        
                objSelect.options[i].text = objItemText;        
                break;        
            }        
        }        
        alert("成功修改");        
    } else {        
        alert("该select中 不存在该项");        
    }        
}        
   
// 6.设置select中text="paraText"的第一个Item为选中        
function jsSelectItemByValue(objSelect, objItemText) {            
    //判断是否存在        
    var isExit = false;        
    for (var i = 0; i < objSelect.options.length; i++) {        
        if (objSelect.options[i].text == objItemText) {        
            objSelect.options[i].selected = true;        
            isExit = true;        
            break;        
        }        
    }              
    //Show出结果        
    if (isExit) {        
        alert("成功选中");        
    } else {        
        alert("该select中 不存在该项");        
    }        
}        
   
// 7.设置select中value="paraValue"的Item为选中    
document.all.objSelect.value = objItemValue;    
       
// 8.得到select的当前选中项的value    
var currSelectValue = document.all.objSelect.value;    
       
// 9.得到select的当前选中项的text    
var currSelectText = document.all.objSelect.options[document.all.objSelect.selectedIndex].text;    
       
// 10.得到select的当前选中项的Index    
var currSelectIndex = document.all.objSelect.selectedIndex;    
       
// 11.清空select的项    
document.all.objSelect.options.length = 0;   

 

 

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