getElementsByName用来获取name一样的一组元素。
应用：
获取一组radio button 的选中值。
例子如下：
应用：
获取一组radio button 的选中值。
例子如下：
<
html
>
< head >
< title > getElementsByName Sample </ title >
< script type ="text/javascript" language ="javascript" >
function getColor() {
var oColors = document.getElementsByName( " rdColor " );
var color = "" ;
for ( var i = 0 ;i < oColors.length;i ++ ) {
if (oColors[i].checked) {
color = oColors[i].value;
break ;
}
}
if (color == "" )
alert( " Please choose a color!! " );
else
alert( " Your favorite color is: " + color);
}
</ script >
</ head >
< body >
< form action ="javascript:getColor();" method ="post" >
< fieldset >
< legend > What color do you like? </ legend >
< input type ="radio" name ="rdColor" value ="red" /> Red < br />
< input type ="radio" name ="rdColor" value ="green" /> Green < br />
< input type ="radio" name ="rdColor" value ="blue" /> Blue < br />
</ fieldset >
< input type ="submit" value ="Submit" />
</ form >
</ body >
</ html >
< head >
< title > getElementsByName Sample </ title >
< script type ="text/javascript" language ="javascript" >
function getColor() {
var oColors = document.getElementsByName( " rdColor " );
var color = "" ;
for ( var i = 0 ;i < oColors.length;i ++ ) {
if (oColors[i].checked) {
color = oColors[i].value;
break ;
}
}
if (color == "" )
alert( " Please choose a color!! " );
else
alert( " Your favorite color is: " + color);
}
</ script >
</ head >
< body >
< form action ="javascript:getColor();" method ="post" >
< fieldset >
< legend > What color do you like? </ legend >
< input type ="radio" name ="rdColor" value ="red" /> Red < br />
< input type ="radio" name ="rdColor" value ="green" /> Green < br />
< input type ="radio" name ="rdColor" value ="blue" /> Blue < br />
</ fieldset >
< input type ="submit" value ="Submit" />
</ form >
</ body >
</ html >
