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- Drop-down menu (dynamically generated drop-down menu)
No title document </ title> <script> function getOptions () {for (i = 0; i <document.form1.s1 .length; i ) // Take the value of the single box {if (Document.form1.s1.Options [0] .Selected == True) {// alert (1); Document.form1.s2.Options.length = 0; Document.form1.s2.Options [0] = new option ('Beijing', '1', False, False); Document.form1.s2.Options [1] = New Option ('Shanghai', '2' , False, False; Document.form1.s2.Options [2] = New Option ('Chongqing', '2', False, False);}}}}}} [1] .selected == True) {// alert (1); Document.form1.s2.Options.Length = 0; Document.form1.S2.Options [0] = New Option ('Luoyang', '1', False, False); Document .form1.s2.Options [1] = new option ('Zhengzhou', '2', false, false);}}}}}}}}}} </ script> </ hEAD></p>
<p><body> <form name = "form1"> <select name = "S1" onchange = "getOptions ()> <option value =" 1 "> municipality directly under the Central Government </ option> <option value =" 2 "> River South / option> </ select> <select name = "s2"> <option value = "1"> Beijing </ option> <option value = "2"> Shanghai </ option> <option value = "3"> Chongqing </ option> </ select> </ form> </ body> </ html></p></div><div class="text-center mt-3 text-grey">
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