前端之家收集整理的这篇文章主要介绍了
不依赖第3方库，用30行JS代码如何实现电子表格，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
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Inspired byhttp://thomasstreet.net/blog/spreadsheet.html. Features:
- Under 30 lines of vanilla JavaScript
- Libraries used:none
- Excel-like Syntax (formulas start with "=")
- Support for arbitrary expressions (=A1+B2*C3)
- Circular reference prevention
- Automatic localStorage persistence
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404_0@li {
list-style: none;
}
li:before {
content: "✓ ";
}
input {
border: none;
width: 80px;
font-size: 14px;
padding: 2px;
}
input:hover {
background-color: #eee;
}
input:focus {
background-color: #ccf;
}
input:not(:focus) {
text-align: right;
}
table {
border-collapse: collapse;
}
td {
border: 1px solid #999;
padding: 0;
}
tr:first-child td,td:first-child {
background-color: #ccc;
padding: 1px 3px;
font-weight: bold;
text-align: center;
}
footer {
font-size: 80%;
}
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404_0@for (var i=0; i<6; i++) {
var row = document.querySelector("table").insertRow(-1);
for (var j=0; j<6; j++) {
var letter = String.fromCharCode("A".charCodeAt(0)+j-1);
row.insertCell(-1).innerHTML = i&&j ? "<input id='"+ letter+i +"'/>" : i||letter;
}
}
var DATA={},INPUTS=[].slice.call(document.querySelectorAll("input"));
INPUTS.forEach(function(elm) {
elm.onfocus = function(e) {
e.target.value = localStorage[e.target.id] || "";
};
elm.onblur = function(e) {
localStorage[e.target.id] = e.target.value;
computeAll();
};
var getter = function() {
var value = localStorage[elm.id] || "";
if (value.charAt(0) == "=") {
with (DATA) return eval(value.substring(1));
} else { return isNaN(parseFloat(value)) ? value : parseFloat(value); }
};
Object.defineProperty(DATA,elm.id,{get:getter});
Object.defineProperty(DATA,elm.id.toLowerCase(),{get:getter});
});
(window.computeAll = function() {
INPUTS.forEach(function(elm) { try { elm.value = DATA[elm.id]; } catch(e) {} });
})();
