- 判斷select選項(xiàng)中 是否存在Value="paraValue"的Item
- 向select選項(xiàng)中 加入一個(gè)Item
- 從select選項(xiàng)中 刪除一個(gè)Item
- 刪除select中選中的項(xiàng)
- 修改select選項(xiàng)中 value="paraValue"的text為"paraText"
- 設(shè)置select中text="paraText"的第一個(gè)Item為選中
- 設(shè)置select中value="paraValue"的Item為選中
- 得到select的當(dāng)前選中項(xiàng)的value
- 得到select的當(dāng)前選中項(xiàng)的text
- 得到select的當(dāng)前選中項(xiàng)的Index
- 清空select的項(xiàng)
js 代碼
-
- 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;
- }
-
-
- function jsAddItemToSelect(objSelect, objItemText, objItemValue) {
-
- if (jsSelectIsExitItem(objSelect, objItemValue)) {
- alert("該Item的Value值已經(jīng)存在");
- } else {
- var varItem = new Option(objItemText, objItemValue);
- objSelect.options.add(varItem);
- alert("成功加入");
- }
- }
-
-
- function jsRemoveItemFromSelect(objSelect, objItemValue) {
-
- 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("成功刪除");
- } else {
- alert("該select中 不存在該項(xiàng)");
- }
- }
-
-
-
- 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;
- }
- }
- }
-
-
- function jsUpdateItemToSelect(objSelect, objItemText, objItemValue) {
-
- 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("該select中 不存在該項(xiàng)");
- }
- }
-
-
- function jsSelectItemByValue(objSelect, objItemText) {
-
- 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;
- }
- }
-
- if (isExit) {
- alert("成功選中");
- } else {
- alert("該select中 不存在該項(xiàng)");
- }
- }
-
-
- document.all.objSelect.value = objItemValue;
-
-
- var currSelectValue = document.all.objSelect.value;
-
-
- var currSelectText = document.all.objSelect.options[document.all.objSelect.selectedIndex].text;
-
-
- var currSelectIndex = document.all.objSelect.selectedIndex;
-
-
- document.all.objSelect.options.length = 0;
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