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<! DOCTYPE html>
<meta charset= "UTF-8" >
<title></title>
<script>
To define a two-dimensional array:
var arr = new Array (4);
Arr[0] = new Array ("Harbin", "Qiqihar", "Daqing", "Jiamusi");
ARR[1] = new Array ("Changchun", "Jilin", "Siping", "Tonghua");
ARR[2] = new Array ("Shenyang City", "Jinzhou", "Dalian", "Tieling");
ARR[3] = new Array ("Zhengzhou", "Luoyang", "Anyang", "Nanyang");
/*
1. Determine the event: OnChange Event
2. Event triggering function
3. function to do something
1. Get which province is currently selected
2. Access to all cities in the province
3. Traverse all the cities
4. Dynamic Creation <option> Shenzhen </option>
5. Attach the created structure to the Cityselect
*/
function Selectpro (value) {
alert (value);
2. Access to all cities in the province
var cities = Arr[value];
var cityselect = document.getElementById ("city");
Console.log (cityselect.innerhtml);
Empty the original content
cityselect.innerhtml = "";
citySelect.options.length = 0;
3. Traverse all the cities
for (Var i=0;i<cities.length;i++) {
Get City text content
var cityname = cities[i];
Console.log (CityName);
4. Create option <option></option>
var opt1 = document.createelement ("option");
5. Create a city text node
var textnode = document.createTextNode (CityName);
6. <option> text Nodes </option>
Opt1.appendchild (Textnode);
7. Add the created structure to the
var cityselect = document.getElementById ("city");
Cityselect.appendchild (OPT1);
}
}
</script>
<body>
<form action= "#" method= "Get" >
<input type= "hidden" name= "id" value= "007"/>
Name: <input name= "username" value= "Xuduoduo"/><br>
Password: <input type= "password" name= "password" value= "123" ><br>
Gender: <input type= "Radio" name= "Sex" value= "1" checked= "checked" > Male
<input type= "Radio" name= "Sex" value= "0" > Female
<br>
Hobbies: <input type= "checkbox" name= "hobby" value= "eat" > Eat
<input type= "checkbox" name= "hobby" value= "Drink" checked= "checked" > Drink
<input type= "checkbox" name= "hobby" value= "Sleep" checked= "checked" > Sleep
<br>
Avatar: <input type= "file" name= "Photo" ><br>
Origin:
<select name= "Pro" onchange= "Selectpro (this.value)" >
<option >-Please select-</option>
<option value= "0" > Heilongjiang </option>
<option value= "1" > Jilin </option>
<option value= "2" > Liaoning </option>
<option value= "3" > Henan </option>
</select>
<select name= "City" id= "City" >
<option >-Please select-</option>
</select>
<br>
Self Introduction:
<textarea name= "Intr" cols= "+" rows= "4" >good!</textarea>
<br>
<input type= "Submit" value= "Save"/>
<input type= "Reset"/>
<input type= "button" value= "normal button"/>
</form>
</body>
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JavaScript implements provincial and municipal linkage
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