Rumah > Artikel > hujung hadapan web > JS实现下拉框联动步骤详解
这次给大家带来JS实现下拉框联动步骤详解,JS实现下拉框联动的注意事项有哪些,下面就是实战案例,一起来看一下。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title> JS下拉联动</title> <script> function setSecond(obj){ var val = obj.value; if(val == 'en'){ var sec = document.getElementById('second'); sec.innerHTML = "<option>one</option><option>two</option>"; }else{ var sec = document.getElementById('second'); sec.innerHTML = "<option>一</option><option>二</option>"; } } </script> </head> <body> <p> <select id="first" onchange="setSecond(this)"> <option value="en">en</option> <option value="zh">zh</option> </select> </p> <p> <select id="second"> </select> </p> </body> </html>
使用innerHTML,IE浏览器不支持这种方法的,所以改进方法:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>JS下拉联动</title> <script> function setSecond(obj){ var val = obj.value; if(val == 'en'){ var sec = document.getElementById('second'); sec.options[0] = new Option("one","one"); sec.options[1] = new Option("two","two"); }else{ var sec = document.getElementById('second'); sec.options[0] = new Option("一","one"); sec.options[1] = new Option("二","two");//可设置循环配置,也可一个一个配置 } } </script> </head> <body> <p> <select id="first" onchange="setSecond(this)"> <option value="en">en</option> <option value="zh">zh</option> </select> </p> <p> <select id="second"> </select> </p> </body> </html>
可以兼容火狐,IE等
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