alert("" + y[x].text + " 是默认选项吗? " + y[x].defaultSelected); } </script> </head> <body> <form> 选择你最喜欢的水果: <select id="mySelect"> <option>Apple</option> <option>Orange</option> <option selected="selected">Pineapple</option> <option>Banana</option> </select> ...
<option>我的担子</option> </select> <input type="button" name="button" value="查看结果" onclick="number();"> </body> </html> 1.动态创建select function createSelect(){ var mySelect = document.createElement("select"); mySelect.id = "mySelect"; document.body.appendChild(mySelect); }...
var e = document.getElementById("selectId");e. options= new Option("文本","值") ; //创建一个option对象,即在<select>标签中创建一个或多个<option value="值">文本</option> //options是个数组,里面可以存放多个<option value="值">文本</option>这样的标签 1:options[ ]数组的属性: length属性...
4 var e = document.getElementById("selectId"); 5 6 e. options= new Option("文本","值") ; 7 8 //创建一个option对象,即在<select>标签中创建一个或多个<option value="值">文本</option> 9 10 //options是个数组,里面可以存放多个<option value="值">文本</option>这样的标签 11 12 1:o...
默认选中这个disabled的option,一旦更换了选择,就不能再选中默认的option了,如下图: 注: (1)此时因为<option disabled selected value="0">default</option>, 所以select1.value==='0', (2)如果<option disabled selected value>default</option>,
alert("" + y[x].text + " 是默认选项吗? " + y[x].defaultSelected); } </script> </head> <body> <form> 选择你最喜欢的水果: <select id="mySelect"> <option>Apple</option> <option>Orange</option> <option selected="selected">Pineapple</option> ...
// 设置默认选中的值（比如默认选择value为'defaultOption'的option） selectElement.val("option3"); ...
使用mycat做读写分离，数据库的权限配置都对，但是一访问程序就报错：no mycat database selected；从...
varx = document.getElementById("mySelect").selectedIndex; vary = document.getElementsByTagName("option"); alert("Is "+ y[x].text+" selected by default? "+ y[x].defaultSelected); Try it Yourself » Description The defaultSelected property returns the default value of the selected attribut...
optionObject.defaultSelected 实例 下面的例子可检测所选项是否是默认选项: </>code <html> <head> <script type="text/javascript"> function alertDefaultSelected() { var x=document.getElementById("mySelect").selectedIndex; var y=document.getElementsByTagName("option"); ...