如何在最后的HTML选择值上使用LocalStorage [英] How to use LocalStorage on last HTML select value
本文介绍了如何在最后的HTML选择值上使用LocalStorage的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何使用JavaScript设置/检索选择下拉菜单的最后选定值?我试图在选择下拉菜单上创建一个onchange函数,该选项设置选定的选项,然后在每个页面加载中加载该值。
How can I set/retrieve the last selected value of a select drop-down with JavaScript? I'm trying to create an onchange function on a select drop-down that that sets the selected option, and then on each page-load, that valued is loaded.
这里是HTML
<select class="testSelect">
<option value="test1">test1</option>
<option value="test2">test2</option>
<option value="test2">test3</option>
<option value="test2">test4</option>
</select>
我在JavaSCript方面遇到了一些麻烦。
I'm having a little trouble with the JavaSCript though.
var select = document.querySelector(".testSelect");
var selectOption = select.options[select.selectedIndex];
var getLast = localStorage.getItem(select, lastSelected);
selectOption = getLast;
select.onchange = function () {
var lastSelected = select.options[select.selectedIndex].value;
localStorage.setItem(select, lastSelected);
}
以下是一个小提琴 http://jsfiddle.net/5yJNL/1/
推荐答案
您HTML中的值错误
The values in your HTML were wrong
<select class="testSelect">
<option value="test1">test1</option>
<option value="test2">test2</option>
<option value="test3">test3</option>
<option value="test4">test4</option>
</select>
Javascript
Javascript
var select = document.querySelector(".testSelect");
var selectOption = select.options[select.selectedIndex];
var lastSelected = localStorage.getItem('select');
if(lastSelected) {
select.value = lastSelected;
}
select.onchange = function () {
lastSelected = select.options[select.selectedIndex].value;
console.log(lastSelected);
localStorage.setItem('select', lastSelected);
}
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