[英]Save view state using HTML5 local storage
我以为我可能会尝试使用本地存储来保存会话状态,但是api令我有些困惑。
我有一个搜索结果视图,该视图可以具有两个切换状态以返回结果。 可以在网格视图或列表视图中返回它们。 用户可以通过单击图标来选择首选视图。 用户单击其中一个图标后,我想将其作为状态存储在本地存储中,因此当用户回来时,不必再次单击。
HTML
<div class="cbp-vm-options">
<a href="#" class="cbp-vm-grid cbp-vm-selected"></a>
<a href="#" class="cbp-vm-list"></a>
</div>
本地存储代码
function saveViewState() {
if (!supportsLocalStorage()) {
return false;
}
localStorage["grid.view.state"] = gViewState;
//Not sure where to go from here
return true;
}
看一下store.js,然后您就不必担心API了,您可以专注于漂亮的清晰示例,而无需担心较旧的浏览器。 这是该网站的引文,显示了一些示例:
//将'marcus'存储在'username'
store.set('用户名','马库斯')//获取“用户名”
store.get( '用户名')//删除“用户名”
store.remove( '用户名')
http://jsfiddle.net/5a03a5ec/1/
HTML
<div class="cbp-vm-options">
<a href="#" class="cbp-vm-grid" data-state="grid"></a>
<a href="#" class="cbp-vm-list" data-state="list"></a>
</div>
<div id="content">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>
CSS
.cbp-vm-options a {
opacity: 0.50;
transition-duration: 800ms;
display: inline-block;
width: 1em;
height: 1em;
background: black;
}
.cbp-vm-options a.cbp-vm-selected {
opacity: 1;
}
.cbp-vm-grid {
}
.cbp-vm-list {
}
#content {
display: flex;
flex-flow: row wrap;
}
#content .item {
border: 10px solid white;
box-sizing: border-box;
background: red;
height: 40px;
width: 100%;
}
#content.grid .item {
width: 25%;
}
JavaScript的
(function() {
var cbp_vm_options, content;
// This function sets the localStorage variable
function setState(event) {
event.preventDefault();
console.log(event);
var new_state = event.target.dataset.state;
if(document.querySelector('.cbp-vm-selected'))
document.querySelector('.cbp-vm-selected').classList.remove('cbp-vm-selected');
event.target.classList.add('cbp-vm-selected')
console.log(new_state);
localStorage.clear();
localStorage.setItem('view_state', new_state);
updateUi();
}
// This function updates the ui for the user depending on the value
// of 'vew_state'. The function is called whenever the value changes.
function updateUi(event) {
content.classList.toggle('grid');
var state = localStorage.getItem('view_state');
if(state === 'grid') {
content.classList.add('grid');
cbp_vm_options.querySelector('.cbp-vm-grid').classList.add('cbp-vm-selected');
} else {
content.classList.remove('grid');
cbp_vm_options.querySelector('.cbp-vm-list').classList.add('cbp-vm-selected');
}
}
function init() {
cbp_vm_options = document.querySelector('.cbp-vm-options'),
content = document.querySelector('#content');
updateUi();
cbp_vm_options.addEventListener('click', setState);
}
document.addEventListener('DOMContentLoaded', init);
})();
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