This time I will bring you a detailed explanation of the steps to implement drop-down box linkage with JS. What are the precautions for JS to implement drop-down box linkage? The following is a practical case, let's take a look.
<!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>
IE browser does not support this method, so the improvement method is:
<!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>
NodeJs mobile phone access local server case analysis
$emit and $on father-son brother components in vue Detailed operation explanation
The above is the detailed content of Detailed explanation of the steps to implement drop-down box linkage with JS. For more information, please follow other related articles on the PHP Chinese website!