js操作select控件大全(包含新增、修改、删除、选中、清空、判断存在等)


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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