Detailed explanation of cookie usage examples in jquery (acquisition, storage, deletion, etc.)

The examples in this article describe the usage of cookies in jquery. Share it with everyone for your reference, the details are as follows:

Cookie has a designated cookie operation class in jquery. Let me first introduce some problems when we use cookie operation classes, and then introduce the correct usage method.

When using JQuery to operate cookies, an incorrect value occurs:
It turns out that cookies have four different attributes:
name, content, domain, path

$.cookie('the_cookie'); // 读取 cookie 
$.cookie('the_cookie', 'the_value'); // 存储 cookie 
$.cookie('the_cookie', 'the_value', { expires: 7 }); // 存储一个带7天期限的 cookie 
$.cookie('the_cookie', '', { expires: -1 }); // 删除 cookie

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Use:

Copy code The code is as follows:

$.cookie("currentMenuID", menuID);

When the domain and path are not specified.

All different cookies will be generated when the domain and path are different

Copy code The code is as follows:

$.cookie("currentMenuID");

Problems arise when taking values.

So:

Copy code The code is as follows:

$.cookie("currentMenuID", "menuID", { path: "/" });

to cover. The same cookieID in the same domain corresponds to a value.

Let’s take a look at an example

Note about the path setting of cookies. If path:'/' is not set, the path will be automatically set according to the directory [such as: http://www.xxx.com/user/, the path will be set to ' /user']

$.extend({ 
/** 
 1. 设置cookie的值，把name变量的值设为value  
example $.cookie('name', ‘value'); 
 2.新建一个cookie 包括有效期 路径 域名等 
example $.cookie('name', ‘value', {expires: 7, path: ‘/', domain: ‘jquery.com', secure: true}); 
3.新建cookie 
example $.cookie('name', ‘value'); 
4.删除一个cookie 
example $.cookie('name', null); 
5.取一个cookie(name)值给myvar 
var account= $.cookie('name'); 
**/
  cookieHelper: function(name, value, options) { 
    if (typeof value != 'undefined') { // name and value given, set cookie 
      options = options || {}; 
      if (value === null) { 
        value = ''; 
        options.expires = -1; 
      } 
      var expires = ''; 
      if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) { 
        var date; 
        if (typeof options.expires == 'number') { 
          date = new Date(); 
          date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000)); 
        } else { 
          date = options.expires; 
        } 
        expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE 
      } 
      var path = options.path &#63; '; path=' + options.path : ''; 
      var domain = options.domain &#63; '; domain=' + options.domain : ''; 
      var secure = options.secure &#63; '; secure' : ''; 
      document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join(''); 
    } else { // only name given, get cookie 
      var cookieValue = null; 
      if (document.cookie && document.cookie != '') { 
        var cookies = document.cookie.split(';'); 
        for (var i = 0; i < cookies.length; i++) { 
          var cookie = jQuery.trim(cookies[i]); 
          // Does this cookie string begin with the name we want&#63; 
          if (cookie.substring(0, name.length + 1) == (name + '=')) { 
            cookieValue = decodeURIComponent(cookie.substring(name.length + 1)); 
            break; 
          } 
        } 
      } 
      return cookieValue; 
    } 
  } 
});

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Jquery operation cookie records the information the user has queried

This is a list generated by Cookie data,

Each time you click to query, a domain name will be stored, and the last domain name queried will be placed at the top. This example can store up to 10 items, you can set them according to your own situation

Let’s take a look at how to achieve it

First write a JS file to operate Cookie as follows

function getid(id) {
return (typeof id == 'string') &#63; document.getElementById(id) : id
};
function getOffsetTop(el, p) {
var _t = el.offsetTop;
while (el = el.offsetParent) {
if (el == p) break;
_t += el.offsetTop
}
return _t
};
function getOffsetLeft(el, p) {
var _l = el.offsetLeft;
while (el = el.offsetParent) {
if (el == p) break;
_l += el.offsetLeft
}
return _l
};
var currentInput = null;
function BoxShow(e) {
var input = e;
if (!input.id) {
input = e.target &#63; e.target : e.srcElement;
}
currentInput = input;
FillUrls("site");
var box = getid("allSitesBoxHdl");
if (box.style.display == 'block' && currentInput.id == input.id) {
return;
}
box.style.left = (getOffsetLeft(input)) + 'px';
box.style.top = (getOffsetTop(input) + (input.offsetHeight - 1)) + 'px';
box.style.width = (input.offsetWidth - 4) + 'px';
box.style.display = 'block';
}
function BoxShowUrls(e) {
BoxShow(e);
}
function InputSetValue(val) {
var obj = currentInput;
obj.value = val;
if (obj.getAttribute('url') == 'true') {
var tags = document.getElementsByTagName('input');
for (var i = 0; i < tags.length; i++) {
if (tags[i].getAttribute('url') == 'true' && tags[i] != obj) {
tags[i].value = val;
}
}
}
BoxHide();
}
//删除时使用，传入一个要删除的值就可以删除
function DelAllSitesValue(value) {
var allSites = $.cookie("site");
allSites = allSites.replace(value + "|", "");
$.cookie("site", allSites, { expires: 7 });
FillUrls("site");
}
function BoxHide() {
if (getid("allSitesBoxHdl")) {
getid("allSitesBoxHdl").style.display = 'none';
}
}
//加载列表
function FillUrls(cookieName) {
var urls = $.cookie(cookieName);
var html = "";
if (urls) {
var urllist = urls.split('|');
var forlength = 0;
var stringcookie;
for (var i = urllist.length - 1; i >= 0; i--) {
var textval = urllist[i];
if ($.trim(textval) != "" && $.trim(textval) != "undefined") {
html += "<li class="lis"><a href="javascript:InputSetValue('" + textval + "');">" + textval + "</a></li><br/>";
forlength = forlength + 1;
if (forlength > 10) {
$.cookie("site", stringcookie, { expires: 7 });
break;
} else {
stringcookie = textval + "|" + stringcookie;
}
}
}
} else {
html += "<li>没有记录</li>"
}
getid("allSitesBoxContent").innerHTML = html;
}
function closeIME(e) {
var obj = e.target &#63; e.target : e.srcElement;
obj.style.imeMode = 'disabled';
}
function OnPaste(e) {
var obj = e.target &#63; e.target : e.srcElement;
setTimeout("MoveHttp('" + obj.id + "')", 100);
}
function MoveHttp(id) {
var val = getid(id).value;
val = val.replace("http://", "");
if (val[val.length - 1] == '/') {
val = val.substring(0, val.length - 1);
}
getid(id).value = val;
}
function OnKeyup(e) {
var obj = e.target &#63; e.target : e.srcElement;
setTimeout("addInput('" + obj.id + "')", 200);
}
function addInput(id) {
var obj = getid(id);
//如果是一个没有True的input不执行
if (obj.getAttribute('url') == 'true') {
if (obj.value.indexOf('。') > 0) {
obj.value = obj.value.replace('。', '.');
}
var tags = document.getElementsByTagName('input');
for (var i = 0; i < tags.length; i++) {
if (tags[i].getAttribute('url') == 'true' && tags[i] != obj) {
tags[i].value = obj.value;
}
}
}
}
function Init() {
$("#allSitesBoxHdl")[0].style.display = 'none';
$(":text").each(function () {
$(this).bind("keyup", OnKeyup);
$(this).bind("mousedown", BoxShowUrls);
$(this).bind("mouseout", BoxHide);
$(this).bind("focus", closeIME);
$(this).bind("paste", OnPaste);
$(this).bind("mouseout", BoxHide);
$(this)[0].setAttribute('autocomplete', 'off');
});
//取出Cookie
var icpSite = $.cookie("site");
if (icpSite) {
//取出Cookie不为空的话就给当前框
icpSite = icpSite.split('|')[0];
$("#site").val(icpSite);
}
}

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This also comes with the effect of inputting the values of multiple input boxes at the same time, as shown below

If you want to use this effect in that input box, just add an attribute as url="true", which is convenient and operable. If you want to add an effect to that box, just add this attribute. If you don't want to add it, just don't add it. url="true"
That's OK.

Add the following code to the interface that uses this effect

<div style="display: none; position: absolute;" id="allSitesBoxHdl" class="classlist"
  onmouseover="this.style.display='block'" onmouseout="this.style.display='none'">
  <ul id="allSitesBoxContent">
  </ul>
</div>
<script type="text/javascript">
Init();
</script>

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Place the other JS directly in a Js file and just quote it in
How is the drop-down list loaded? Just look at one of the methods below to find out

Loading list

function FillUrls(cookieName) {
var urls = $.cookie(cookieName);
var html = "";
if (urls) {
var urllist = urls.split('|');
var forlength = 0;
var stringcookie;
for (var i = urllist.length - 1; i >= 0; i--) {
var textval = urllist[i];
if ($.trim(textval) != "" && $.trim(textval) != "undefined") {
html += "<li class="lis"><a href="javascript:InputSetValue('" + textval + "');">" + textval + "</a></li><br/>";
forlength = forlength + 1;
if (forlength > 10) {//在这里我只加载10条，大家可以根据自己的情况进行调整
$.cookie("site", stringcookie, { expires: 7 });
break;
} else {//如果超出10个的话就取最后10个
stringcookie = textval + "|" + stringcookie;
}
}
}
} else {
html += "<li>没有记录</li>"
}
getid("allSitesBoxContent").innerHTML = html;
}

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After completing this, we only need to store the cookie when we click the query. See the method below

Operating Cookie Class

function setCookie(name, value) {
var oldcookie = $.cookie(name);
if (oldcookie == null) {
$.cookie(name, value, { expires: 7 });
} else {
if ($.cookie(name).indexOf(value) == -1) {
$.cookie(name, oldcookie + "|" + value, { expires: 7 });
} else {
$.cookie(name, oldcookie.replace(value, "") + "|" + value, { expires: 7 });
}
}
FillUrls(name);
}

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Write like this when calling

Copy code The code is as follows:

setCookie("site", strdomin);

Ok the function is completed.

Conduct specific tests

The code is not very well written. I hope you can give me more suggestions so that we can make corresponding modifications and strive to improve it.

Cookies are stored on the client side. One cookie can only access cookies under the same domain name. Subdomain names can access each other. Just add the domain attribute. The storage method is as follows

Copy code The code is as follows:

$.cookie("domain", value, { expires: 7, domain: " 7c.com" });

Just write $.cookie("domain"); to get the time. As long as it is a subdomain name, you can call it like this, so that you can achieve the cookie sharing function under this domain name.

The effective use of cookies will bring many unexpected effects and functions to our website, please share with us

For more information about jQuery’s cookie operation, please view this site’s special topic: " Summary of jQuery’s cookie operation skills "

I hope this article will be helpful to everyone in jQuery programming.