在重新加载时保持JavaScript切换打开

时间:2012-05-13 18:42:46

标签: javascript toggle

我有一个JavaScript函数,可以让我切换联系表单的可见性。表单提交后,我希望表单保持打开状态。是否有一些创建cookie的方法可以告诉脚本在提交后重新加载页面时显示表单。

HTML

<a href="#" onClick="toggle_visibility('toggle');">Contact</a>

CSS

#toggle{
    display:none;
}

JS

function toggle_visibility(id) {
    var e = document.getElementById(id);
    if(e.style.display == 'block'){
        e.style.display = 'none';
    }else{
        e.style.display = 'block';
    }
}

2 个答案:

答案 0 :(得分:2)

您可以使用任何服务器端技术重定向到/ ThePage?toggle = 1并使用以下内容读取url参数:

function onload() {
    var toggle = getUrlParams()["toggle"];
    if (toggle == "1") toggle_visibility('toggle');
}

function getUrlParams() {
    var vars = [], hash;
    var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    for(var i = 0; i < hashes.length; i++)
    {
        hash = hashes[i].split('=');
        vars.push(hash[0]);
        vars[hash[0]] = hash[1];
    }
    return vars;
}

答案 1 :(得分:1)

您可以使用本地javascript(不涉及服务器)将状态保存在cookie中:

function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

function toggle_visibility(id, cookieName) {
   var e = document.getElementById(id);
   var visible;
   if(e.style.display == 'block') {
      e.style.display = 'none';
      visible = false;
   } else {
      e.style.display = 'block';
      visible = true;
   }
   if (cookieName) {
       createCookie(cookieName, visible, 1);
   }
}

然后,当您加载页面时,您可以在加载DOM后通过调用此函数来恢复以前的状态:

function restore_visibility(id, cookieName) {
    var visibility = readCookie(cookieName);
    if (visibility == null) return;    // no cookie
    var e = document.getElementById(id);
    if (visibility) {
        e.style.display = 'block';
    } else {
        e.style.display = 'none';
    }
}

您可以使用"contactFormVisible"之类的字符串作为cookieName。