[英]HTML5 Local Storage store form data for select box where multiple values are selected
我有一個表格可以保存用戶在本地存儲中的優勢,可以在這個小提琴或下面看到。
到目前為止,我有兩個主要問題。
我最大的問題是我所擁有的對於具有一個選項的選擇字段非常有用,但在這種情況下,用戶可以選擇多個,因此我需要添加多少,以便用戶可以將多個值保存到本地存儲,以便下次他們加載頁面會保存多個選項?
<form name="Filter"> <select multiple="1" id="filter"> <option value="111">Andrew</option> <option value="222">Bill</option> <option value="333">Charles</option> <option value="444">Dikembe</option> <option value="555">Edward</option> </select> </form> <div id="store">click to store</div> <br> <h3>People I have stored</h3> <div id="myStorage"></div>
JS
var iSelectedTitle = localStorage.getItem('title');
var iSelectedVal = localStorage.getItem('value');
console.log("iSelectedTitle: " + iSelectedTitle);
console.log("iSelectedVal: " + iSelectedVal);
$("#filter option").each(function () {
if ($(this).val() == iSelectedVal) {
$(this).attr("selected", "selected");
}
});
$("#store").click(function () {
var mytitle = $("#filter option:selected").text();
var storedTitle = localStorage.setItem("title", mytitle);
console.log("mytitle: " + mytitle);
console.log("storedTitle: " + storedTitle);
var myValue = $("#filter option:selected").val();
var storedValue = localStorage.setItem("value", myValue);
console.log("myValue: " + myValue);
console.log("storedValue: " + storedValue);
if (iSelectedTitle != "undefined") {
$('#myStorage').empty().append(iSelectedTitle);
}
});
if (iSelectedTitle != "undefined") {
$('#myStorage').append(iSelectedTitle + ' - <a target= "_blank "href="http://www.example.com/' + iSelectedVal + '">View profile</a>');
}
您可以使用jQuery的map
向數組添加多個選項:
var optArray = $("#filter option:selected").map(function () {
return {
"title": this.innerHTML,
"value": this.value
}
}).get();
這會給你一個很好的數組,如下所示:
[
{ "title": "Andrew", "value": "111" },
{ "title": "Bill", "value": "222" },
{ "title": "Charles", "value": "333" }
]
要添加到localStorage:
$("#store").click(function () {
//get the selected options in the form of an array
var optArray = $("#filter option:selected").map(function () {
return {
"title": this.innerHTML,
"value": this.value
}
}).get();
console.log(optArray);
//set that to localStorage
localStorage["optArray"] = JSON.stringify(optArray);
//refresh myStorage
getFromStore();
});
要使用新添加的人刷新myStorage
容器,您必須將此處理程序稱為`click事件中的最后一個事件(上圖)。
var getFromStore = function () {
//check if store values are null, if null, make store =[]
var store = [undefined, null].indexOf(localStorage["optArray"]) != -1 ? [] : JSON.parse(localStorage["optArray"]);
console.log(store);
//empty container before u put values
$('#myStorage').html('');
//check if store is empty
if (store.length != 0) {
//loop over store if it aint empty and append the content into myStorage div
for (var k in store) {
var str = '<div>' + store[k]["title"] + ' - <a target= "_blank" href="http://www.example.com/' + store[k]["value"] + '">View profile</a></div>';
console.log(store[k]);
$('#myStorage').append(str);
}
} else {
//do this if no data is found in localStorage
$("#myStorage").html("No people found in store");
}
}
然后,在DOM ready
,調用getFromStore
以在頁面加載時刷新myContainer
:
$(function() {
getFromStore();
})
演示: http : //jsfiddle.net/hungerpain/hqVGS/9/
編輯
要默認選中復選框,請在getFromStore
函數中添加以下行:
$("[value=" + store[k]["value"] + "]","#filter").prop("selected", true); //find the option with the corresponding value and select it
更新的演示: http : //jsfiddle.net/hungerpain/hqVGS/10/
您可以在數組中保存多個值,
var myValuesArr = ['one','two','three'];
在將數組保存到localStorage
之前,需要對其進行序列化
var serialVals = JSON.stringify(myValuesArr);
localStorage.setItem('numbers',serialVals);
同樣,存儲的數據在回讀后必須進行反序列化
var serialVals = localStorage.getItem('numbers');
var myValuesArr = JSON.parse(serialVals);
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