创建自定义函数时你需要从 GC.Spread.CalcEngine.Functions.Function 派生并重写一些关键方法，下面是示例代码:
evaluate函数会返回一个GC.Spread.CalcEngine.CalcArray对象，以表示自定义函数返回一个数组，如下代码所示:
在你添加自己的函数后,如果要删除它或者清楚所有的自定义函数,请使用removeCustomFunction 或 clearCustomFunctions 方法.
<template>
<div class="sample-tutorial">
<gc-spread-sheets class="sample-spreadsheets" @workbookInitialized="initSpread">
<gc-worksheet>
</gc-worksheet>
</gc-spread-sheets>
<div class="options-container">
<div class="option-row">
<input type="button" value="Add a Custom Function(factorial)" @click="addCustomFunction($event)" />
<input type="button" value="Remove the Custom Function(factorial)" @click="removeCustomFunction($event)" />
</div>
</div>
</div>
</template>
<script>
import Vue from "vue";
import '@grapecity-software/spread-sheets-resources-zh';
GC.Spread.Common.CultureManager.culture("zh-cn");
import '@grapecity-software/spread-sheets-vue'
import GC from '@grapecity-software/spread-sheets';
import './styles.css';
let App = Vue.extend({
name: "app",
methods:{
initSpread: function (spread) {
this.spread = spread;
spread.options.allowDynamicArray = true;
var sheet = spread.getSheet(0);
sheet.setValue(1, 1, 'Press \'Add a Custom Function\' button');
sheet.setColumnWidth(1, 225);
sheet.setColumnWidth(2, 100);
function FactorialFunction() {
this.name = "FACTORIAL";
this.maxArgs = 1;
this.minArgs = 1;
}
FactorialFunction.prototype = new GC.Spread.CalcEngine.Functions.Function();
FactorialFunction.prototype.evaluate = function (arg) {
var result = 1;
if (arguments.length === 1 && !isNaN(parseInt(arg))) {
for (var i = 1; i <= arg; i++) {
result = i * result;
}
return result;
}
return "#VALUE!";
};
this.factorial = new FactorialFunction();
function FactorialArrayFunction() {
this.name = "FACTORIAL.ARRAY";
this.maxArgs = 1;
this.minArgs = 1;
}
FactorialArrayFunction.prototype = new GC.Spread.CalcEngine.Functions.Function();
FactorialArrayFunction.prototype.evaluate = function (arg) {
var t = 1;
var result = [[]];
if (arguments.length === 1 && !isNaN(parseInt(arg))) {
for (var i = 1; i <= arg; i++) {
t = i * t;
result[0].push(t);
}
return new GC.Spread.CalcEngine.CalcArray(result);
}
return "#VALUE!";
};
this.factorialArray = new FactorialArrayFunction();
},
addCustomFunction: function(e) {
var sheet = this.spread.sheets[0];
sheet.addCustomFunction(this.factorial);
sheet.setValue(3, 1, 'Formula');
sheet.setValue(3, 2, '=FACTORIAL(5)');
sheet.setValue(4, 1, 'Result');
sheet.setFormula(4, 2, "=factorial(5)");
sheet.addCustomFunction(this.factorialArray);
sheet.setValue(6, 1, 'Formula');
sheet.setValue(6, 2, '=FACTORIAL.ARRAY(5)');
sheet.setValue(7, 1, 'Result');
sheet.setFormula(7, 2, "=FACTORIAL.ARRAY(5)");
},
removeCustomFunction: function(e) {
var sheet = this.spread.sheets[0];
sheet.removeCustomFunction("FACTORIAL");
sheet.removeCustomFunction("FACTORIAL.ARRAY");
sheet.recalcAll(true);
}
}
});
new Vue({ render: h => h(App) }).$mount('#app');
</script>
<!doctype html>
<html style="height:100%;font-size:14px;">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" type="text/css"
href="$DEMOROOT$/zh/vue/node_modules/@grapecity-software/spread-sheets/styles/gc.spread.sheets.excel2013white.css">
<!-- SystemJS -->
<script src="$DEMOROOT$/zh/vue/node_modules/systemjs/dist/system.src.js"></script>
<script src="systemjs.config.js"></script>
<script>
System.import('./src/app.vue');
System.import('$DEMOROOT$/zh/lib/vue/license.js');
</script>
</head>
<body>
<div id="app"></div>
</body>
</html>
.sample-tutorial {
position: relative;
height: 100%;
overflow: hidden;
}
.sample-spreadsheets {
width: calc(100% - 280px);
height: 100%;
overflow: hidden;
float: left;
}
.options-container {
float: right;
width: 280px;
padding: 12px;
height: 100%;
box-sizing: border-box;
background: #fbfbfb;
overflow: auto;
}
.option-row {
margin-bottom: 12px;
}
input[type=button] {
padding: 4px 6px;
margin-bottom: 6px;
}
body {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
(function(global) {
System.config({
transpiler: 'plugin-babel',
babelOptions: {
es2015: true
},
meta: {
'*.css': { loader: 'css' },
'*.vue': { loader: 'vue-loader' }
},
paths: {
// paths serve as alias
'npm:': 'node_modules/'
},
// map tells the System loader where to look for things
map: {
'@grapecity-software/spread-sheets': 'npm:@grapecity-software/spread-sheets/index.js',
'@grapecity-software/spread-sheets-resources-zh': 'npm:@grapecity-software/spread-sheets-resources-zh/index.js',
'@grapecity-software/spread-sheets-vue': 'npm:@grapecity-software/spread-sheets-vue/index.js',
'@grapecity-software/jsob-test-dependency-package/react-components': 'npm:@grapecity-software/jsob-test-dependency-package/react-components/index.js',
'jszip': 'npm:jszip/dist/jszip.js',
'css': 'npm:systemjs-plugin-css/css.js',
'vue': 'npm:vue/dist/vue.min.js',
'vue-loader': 'npm:systemjs-vue-browser/index.js',
'tiny-emitter': 'npm:tiny-emitter/index.js',
'plugin-babel': 'npm:systemjs-plugin-babel/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel/systemjs-babel-browser.js'
},
// packages tells the System loader how to load when no filename and/or no extension
packages: {
src: {
defaultExtension: 'js'
},
rxjs: {
defaultExtension: 'js'
},
"node_modules": {
defaultExtension: 'js'
}
}
});
})(this);
