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The selectedIndex property sets or returns the index of the selected option in a drop-down list.
selectedIndex 属性可设置或返回下拉列表中选中项的index值
Note: If the dropdown list allows for multiple selections it will only return the index of the first option selected.
注意:如果下拉列表可进行多项的选择,那么只会返回出第一个被选中的项目index值
selectObject.selectedIndex=number |
<html> <head> <script type="text/javascript"> function getOptionIndex() { var x=document.getElementById("mySelect") alert(x.selectedIndex) } </script> </head> <body> <form> Select your favorite fruit: <select id="mySelect"> <option>Apple</option> <option>Orange</option> <option>Pineapple</option> <option>Banana</option> </select> <br /><br /> <input type="button" onclick="getOptionIndex()" value="Alert index of selected fruit"> </form> </body> </html> |
Alert the index of the selected option in a dropdown list
提示下拉列表里被选中项目的index值
Alert the text of the selected option in a dropdown list
提示下拉列表中被选中项目的文字
Change the text of the selected option
改变选中项目的文字
Remove options from a dropdown list
从下拉列表中删除可选项