Javascript记住从下拉菜单中选择的选项值 [英] Javascript remember selected option value from dropdown menu
问题描述
进行一些研究，现在我知道我必须编写所选选项的cookie.然后读取Cookie以获取该值.
Doing a bit of research I now know I have to write the cookie of the selected option. then read the cookie to retrieve the value.
我发现了一个类似的问题，但无法从答案中找出如何实现代码
I found a similar question but couldn't figure out how to implement the code from the answer
<html>
<head>
<title>dropdown remember selection test</title>
</head>
<body>
<iframe id="stream_iframe" marginwidth="0" marginheight="0" width="854" height="480" scrolling="no" allowtransparency="true" frameborder="0" framespacing="0" name="stream_iframe" src="http://vaughnlive.tv/embed/video/moviebay"></iframe>
<form>
<select name="options" onchange="document.getElementById('stream_iframe').src = this.options[this.selectedIndex].value">
<option>SELECT STREAM
<option value="https://streamup.com/rooms/jumanjijoes-Channel/plugins/video/show?startMuted=false">Jumanjijoe</option>
<option value="http://vaughnlive.tv/embed/video/whenlinkattacks">Whenlinkattacks</option>
<option value="https://streamup.com/rooms/docblus-Channel/plugins/video/show?startMuted=false">Docblu</option>
<option value="http://vaughnlive.tv/embed/video/karenwaifu">Karenmaiwaifu</option>
<option value="http://vaughnlive.tv/embed/video/ninjatart">Nightsanity</option>
<option value="http://vaughnlive.tv/embed/video/frightfest0001">Frightfest0001</option>
<option value="http://vaughnlive.tv/embed/video/anime_hq">Anime HQ</option>
<option value="http://vaughnlive.tv/embed/video/moviebay">MovieBay</option>
<option value="http://vaughnlive.tv/embed/video/freakyfetish101">Horror Movie</option>
<option value="http://vaughnlive.tv//embed/video/111aaacharkmovies">111aaacharkmovies </option>
</select>
</form>
</body>
</html>
我设法创建了一个下拉菜单，该菜单将更改iframe SRC.我只需要记住它们在刷新或浏览器退出时选择的内容即可.
I managed to create a dropdown menu that will change the iframe SRC. I just need it to remember what they select on refresh or browser exit.
推荐答案
为此，当用户选择值存储时，将值存储到浏览器的本地/或会话存储中，并且当用户重新打开时，首先检查本地存储是否具有该值或如果是，则不使用jquery选择该值.
For this when user selects the value store the value to either local/or session storage of your browser and when user reopens first check whether local storage has the value or not if yes select the value using jquery.
// Store
localStorage.setItem("lastname", "Smith");
// Retrieve
document.getElementById("result").innerHTML = localStorage.getItem("lastname");
您可以在w3schools上了解如何使用本地存储: http://www.w3schools.com/html/html5_webstorage.asp
You can see how to use local storage at w3schools: http://www.w3schools.com/html/html5_webstorage.asp
在此处查找完整代码
<iframe id="stream_iframe" marginwidth="0" marginheight="0" width="854" height="480" scrolling="no" allowtransparency="true" frameborder="0" framespacing="0" name="stream_iframe" src="http://vaughnlive.tv/embed/video/moviebay"></iframe>
<form>
<select name="options" onchange="callMe(this);" id="selectMovie">
<option>SELECT STREAM
<option value="https://streamup.com/rooms/jumanjijoes-Channel/plugins/video/show?startMuted=false">Jumanjijoe</option>
<option value="http://vaughnlive.tv/embed/video/whenlinkattacks">Whenlinkattacks</option>
<option value="https://streamup.com/rooms/docblus-Channel/plugins/video/show?startMuted=false">Docblu</option>
<option value="http://vaughnlive.tv/embed/video/karenwaifu">Karenmaiwaifu</option>
<option value="http://vaughnlive.tv/embed/video/ninjatart">Nightsanity</option>
<option value="http://vaughnlive.tv/embed/video/frightfest0001">Frightfest0001</option>
<option value="http://vaughnlive.tv/embed/video/anime_hq">Anime HQ</option>
<option value="http://vaughnlive.tv/embed/video/moviebay">MovieBay</option>
<option value="http://vaughnlive.tv/embed/video/freakyfetish101">Horror Movie</option>
<option value="http://vaughnlive.tv//embed/video/111aaacharkmovies">111aaacharkmovies </option>
</select>
</form>
<script>
function callMe(obj){
localStorage.setItem("selectedStream",obj.options[obj.selectedIndex].value);
document.getElementById('stream_iframe').src = obj.options[obj.selectedIndex].value;
}
document.getElementById("stream_iframe").src = localStorage.getItem("selectedStream");
document.getElementById("selectMovie").value = ""+localStorage.getItem("selectedStream")+"";
</script>
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