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| <!DOCTYPE html>
<body>
<ul></ul>
<form>
<div>
<div>
<label for="none">不筛选</label>
<input type="radio" name="value" value="none" id="none" checked />
</div>
</div>
<div>
<div>
<label for="only">单个值筛选</label>
<input type="radio" name="value" value="only" id="only" />
</div>
<div>
<label for="onlytext">值</label>
<input type="text" name="onlytext" id="onlytext" />
</div>
</div>
<div>
<div>
<label for="range">筛选范围内的值</label>
<input type="radio" name="value" value="range" id="range" />
</div>
<div>
<label for="rangelowertext">范围下限</label>
<input type="text" name="rangelowertext" id="rangelowertext" />
</div>
<div>
<label for="rangeuppertext">范围上限</label>
<input type="text" name="rangeuppertext" id="rangeuppertext" />
</div>
</div>
<div>
<div>
<label for="lower">筛选不低于下限的值</label>
<input type="radio" name="value" value="lower" id="lower" />
</div>
<div>
<label for="lowerboundtext">下限</label>
<input type="text" name="lowerboundtext" id="lowerboundtext" />
</div>
</div>
<div>
<div>
<label for="upper">筛选不高于上限的值</label>
<input type="radio" name="value" value="upper" id="upper" />
</div>
<div>
<label for="upperboundtext">上限</label>
<input type="text" name="upperboundtext" id="upperboundtext" />
</div>
</div>
<div>
<div>
<input type="radio" name="filterIndex" value="fThing" id="thing" checked />
<label for="thing">按名称筛选和排序</label>
</div>
<div>
<input type="radio" name="filterIndex" value="fRating" id="rating" />
<label for="rating">按评分筛选和排序</label>
</div>
</div>
<input class="run" type="submit" value="查询">
</form>
</body>
<script>
var db;
var things = [
{ fThing: "Drum kit", fRating: 10 },
{ fThing: "Family", fRating: 10 },
{ fThing: "Batman", fRating: 9 },
{ fThing: "Brass eye", fRating: 9 },
{ fThing: "The web", fRating: 9 },
{ fThing: "Mozilla", fRating: 9 },
{ fThing: "Firefox OS", fRating: 9 },
{ fThing: "Curry", fRating: 9 },
{ fThing: "Paneer cheese", fRating: 8 },
{ fThing: "Mexican food", fRating: 8 },
{ fThing: "Chocolate", fRating: 7 },
{ fThing: "Heavy metal", fRating: 10 },
{ fThing: "Monty Python", fRating: 8 },
{ fThing: "Aphex Twin", fRating: 8 },
{ fThing: "Gaming", fRating: 7 },
{ fThing: "Frank Zappa", fRating: 9 },
{ fThing: "Open minds", fRating: 10 },
{ fThing: "Hugs", fRating: 9 },
{ fThing: "Ale", fRating: 9 },
{ fThing: "Christmas", fRating: 8 },
];
var list = document.querySelector("ul");
var form = document.querySelector("form");
var thing = document.querySelector("#thing");
var rating = document.querySelector("#rating");
var button = document.querySelector("button");
var onlyText = document.querySelector("#onlytext");
var rangeLowerText = document.querySelector("#rangelowertext");
var rangeUpperText = document.querySelector("#rangeuppertext");
var lowerBoundText = document.querySelector("#lowerboundtext");
var upperBoundText = document.querySelector("#upperboundtext");
window.onload = function() {
rating.onchange = e => {
document.querySelectorAll('input[type=text]').forEach(v => {
v.setAttribute('pattern', '[0-9]');
v.title = '请输入数字！';
});
};
thing.onchange = e => {
document.querySelectorAll('input[type=text]').forEach(v => {
v.setAttribute('pattern', '[A-Z]{1}');
v.title = '请输入单个大写字母！';
});
};
form.onsubmit = e => {
e.preventDefault();
displayData();
};
window.indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
window.IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction || window.msIDBTransaction;
window.IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange || window.msIDBKeyRange;
var DBOpenRequest = window.indexedDB.open("fThings", 1);
DBOpenRequest.onsuccess = function(event) {
db = DBOpenRequest.result;
populateData();
};
DBOpenRequest.onupgradeneeded = function(event) {
var db = event.target.result;
db.onerror = function(event) {
note.innerHTML += "<li>Error loading database.</li>";
};
var objectStore = db.createObjectStore("fThings", { keyPath: "fThing" });
objectStore.createIndex("fRating", "fRating", { unique: false });
};
function populateData() {
var transaction = db.transaction(["fThings"], "readwrite");
var objectStore = transaction.objectStore("fThings");
for (i = 0; i < things.length; i++) {
var request = objectStore.put(things[i]);
}
transaction.oncomplete = function() {
displayData();
};
}
var keyRangeValue = null;
function displayData() {
checkedValue = document.querySelector('input[name="value"]:checked').value;
var transaction = db.transaction(["fThings"], "readonly");
var objectStore = transaction.objectStore("fThings");
var filterIndex = document.querySelector('input[name="filterIndex"]:checked').value;
if (filterIndex == "fThing") {
if (checkedValue == "none") {
keyRangeValue = null;
} else if (checkedValue == "only") {
keyRangeValue = IDBKeyRange.only(onlyText.value);
} else if (checkedValue == "range") {
keyRangeValue = IDBKeyRange.bound(rangeLowerText.value, rangeUpperText.value, false, false);
} else if (checkedValue == "lower") {
keyRangeValue = IDBKeyRange.lowerBound(lowerBoundText.value);
} else if (checkedValue == "upper") {
keyRangeValue = IDBKeyRange.upperBound(upperBoundText.value);
}
} else {
objectStore = objectStore.index("fRating");
if (checkedValue == "none") {
keyRangeValue = null;
} else if (checkedValue == "only") {
keyRangeValue = IDBKeyRange.only(parseFloat(onlyText.value));
} else if (checkedValue == "range") {
keyRangeValue = IDBKeyRange.bound(parseFloat(rangeLowerText.value), parseFloat(rangeUpperText.value), false, false);
} else if (checkedValue == "lower") {
keyRangeValue = IDBKeyRange.lowerBound(parseFloat(lowerBoundText.value));
} else if (checkedValue == "upper") {
keyRangeValue = IDBKeyRange.upperBound(parseFloat(upperBoundText.value));
}
}
if (keyRangeValue != null) {
const { lower, upper, lowerOpen, upperOpen } = keyRangeValue;
console.log(`范围的下限: ${lower},下限值是否包含在键范围内: ${lowerOpen}\n
范围的上限: ${upper}, 上限值是否包含在键范围内: ${upperOpen}`);
}
list.innerHTML = "";
objectStore.openCursor(keyRangeValue).onsuccess = function(event) {
var cursor = event.target.result;
if (cursor) {
var listItem = document.createElement("li");
listItem.innerHTML = "<strong>" + cursor.value.fThing + "</strong>, " + cursor.value.fRating;
list.appendChild(listItem);
cursor.continue();
}
};
var countRequest = objectStore.count(keyRangeValue);
countRequest.onsuccess = function() {
var listItem = document.createElement("li");
listItem.innerHTML = "<strong>总计</strong>: " + countRequest.result;
list.insertAdjacentElement('afterbegin', listItem);
};
};
};
</script>
<style>
ul {
list-style-type: none;
flex: 100px;
margin-right: 1em;
padding: 2rem 1rem;
text-align: center;
background: white linear-gradient(to bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));
box-shadow: 3px 3px 10px black;
}
li {
padding-bottom: 1rem;
}
body {
display: flex;
}
form {
flex: 5;
margin-top: 1rem;
}
form>div {
margin-bottom: 1rem;
padding: 1rem 1rem 2rem;
background: white linear-gradient(to bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));
box-shadow: 3px 3px 10px black;
}
form div div {
clear: both;
margin-top: 1rem;
}
form div label {
width: 55%;
clear: both;
}
form div input {
float: right;
}
form div input[type="text"] {
width: 30%;
}
form div input[type="radio"] {
margin-right: 10px;
}
button {
display: block;
width: 30%;
margin: 0 auto;
line-height: 1.5;
box-shadow: 1px 1px 2px black;
}
:invalid {
outline-color: red;
}
</style>
|
