<select id="test"> <option selected value="0">- 请选择 -</option> <option value="1">关羽</option> <option value="2">赵云</option> <option value="3">马超</option> <option value="4">黄忠</option> <option value="5">张飞</option> </select> <input type="text" id="sel_text"...
There are two solutions, as far as I know. both that just need using vanilla javascript 1 selectedOptions <divclass="select-box clearfix"><labelfor="area">Area</label><selectid="area"><optionvalue="101">A1</option><optionvalue="102">B2</option><optionvalue="103">C3</option></selec...
设置与传入的'色号'value相同的option为selected9for(vari=0;i<cLength;i++) {10ov=document.getElementById('color').options[i].value;11if(ov ==cValue){12document.getElementById('color').options[i].selected='selected';13}14}15//判断。设置与传入的'尺码'value相同的option为selected16for(varj...
render() { let items = ['a', 'b', 'c', 'd'] .map((fileName) => ( if(fileName == 'd'){ <option key={fileName} value={fileName} selected> {fileName} </option> }else{ <option key={fileName} value={fileName}> {fileName} </option> } )); return ( <div> <select o...
let items = ['a', 'b', 'c', 'd'] .map((fileName) => ( <option key={fileName} value={fileName}> {fileName} </option> )); 但是加了 if else 就不行了。 已经搞定了～ 不用判断if else, 只需要在option中加上value属性, 当属性和option的value相同时,就会自动显示...
Retrieving the selected option in Vue.js when @change event occurs, Setting Selected Option Value in Vue JS: A Guide, Vue.js: Retrieving the text of the selected option
option_2的值是一个数组，包含了下拉列表的所有选项，这段代码是遍历下拉列表的所有选项，只有当某个选项被选中(selected)，才将这一选项的值赋给vase。举个例子：===请选择=== A B C option_2包含了ABC 如果选中B，vase的值就是B 那
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(1)原生javascript有map方法么?不是jQuery才有么? 查阅资料才知道,map方法是一个JavaScript扩展到ECMA-262标准中的新方法,最新的版本是:Standard ECMA-262 6th Edition / June 2015 ,实际写程序测试了下,在Google、Firefox和IE9及以上都能运行! AI检测代码解析 ...
<html> <head> <script type="text/javascript"> function resetSelect() { document.getElementById('select1').selectedIndex = 0; } </script> </head> <body> <select name="select1" id="select1"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select...