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Javascript implementation of provincial/municipal drop-down Boxes Based on DOM

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Javascript implementation of provincial/municipal drop-down Boxes Based on DOM

This example describes how to implement the provincial/municipal drop-down Box Based on DOM in javascript. Share it with you for your reference. The specific implementation method is as follows:

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<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>

<Title> provincial/municipal drop-down list </title>

<Script type = "text/javascript">

Var provs = {"Jiangxi Province": ["Nanchang city", "Jingdezhen", "Jiujiang", "Yingtan", "Pingxiang", "Xinyu", "Ganzhou ", "Ji 'an", "Yichun", "Fuzhou", "Shangrao"],

"Fujian Province": ["Fuzhou", "Xiamen", "Putian", "Sanming", "Quanzhou", "Zhangzhou", "Nanping", "Longyan ", "Ningde"],

"Hebei Province": ["Shijiazhuang", "Handan", "Xingtai", "Baoding", "Zhangjiakou", "Chengde", "Langfang", "Tangshan ", "Qinhuangdao", "Cangzhou", "Hengshui"]

};

Function loadProv (){

// Load province data

Var prov = document. getElementById ("prov ");

For (var key in provs ){

Var provName = key;

Var optProv = document. createElement ("option ");

OptProv. value = provName;

OptProv. innerText = provName;

Prov. appendChild (optProv );

}

}

Function provChange (){

Var prov = document. getElementById ("prov ");

Var city = document. getElementById ("city ");

Var provName = prov. value;

// Hide the city drop-down list if no province is selected

If (provName = "none "){

City. style. display = "none ";

Return;

}

Else {

City. style. display = "";

}

Var citys = provs [provName];

// City. options. length = 0;

// You can use this method to clear the original list.

// Clear the original city data

For (var I = city. childNodes. length-1; I> = 0; I --){

Var child = city. childNodes [I];

City. removeChild (child );

}

// Add New City Data

For (var I = 0; I <citys. length; I ++ ){

Var optCity = document. createElement ("option ");

OptCity. value = citys [I];

OptCity. innerText = citys [I];

City. appendChild (optCity );

}

}

</Script>

</Head>

<Body onload = "loadProv ()">

<Select id = "prov" onchange = "provChange ()">

<Option value = "none"> select province </option>

</Select>

<Select id = "city" style = "display: none"> </select>

</Body>

</Html>

I hope this article will help you design javascript programs.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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