8aaac1edd5
refs #4439 - Brings our custom foreach helper (which has extra features) back into line with Handlebar's own each helper - Adds a new @number variable to foreach, so that building numbered lists is PEASY - Improved the existing tests, and added a few more
103 lines
2.7 KiB
JavaScript
103 lines
2.7 KiB
JavaScript
// # Foreach Helper
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// Usage: `{{#foreach data}}{{/foreach}}`
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//
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// Block helper designed for looping through posts
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var hbs = require('express-hbs'),
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errors = require('../errors'),
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hbsUtils = hbs.handlebars.Utils,
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foreach;
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foreach = function (context, options) {
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if (!options) {
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errors.logWarn('Need to pass an iterator to #foreach');
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}
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var fn = options.fn,
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inverse = options.inverse,
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i = 0,
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columns = options.hash.columns,
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ret = '',
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data,
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contextPath;
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if (options.data && options.ids) {
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contextPath = hbsUtils.appendContextPath(options.data.contextPath, options.ids[0]) + '.';
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}
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if (hbsUtils.isFunction(context)) {
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context = context.call(this);
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}
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if (options.data) {
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data = hbs.handlebars.createFrame(options.data);
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}
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function execIteration(field, index, last) {
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if (data) {
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data.key = field;
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data.index = index;
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data.number = index + 1;
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data.first = index === 0;
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data.last = !!last;
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data.even = index % 2 === 1;
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data.odd = !data.even;
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data.rowStart = index % columns === 0;
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data.rowEnd = index % columns === (columns - 1);
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if (contextPath) {
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data.contextPath = contextPath + field;
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}
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}
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ret = ret + fn(context[field], {
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data: data,
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blockParams: hbsUtils.blockParams([context[field], field], [contextPath + field, null])
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});
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}
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function iterateArray(context) {
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var j;
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for (j = context.length; i < j; i += 1) {
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execIteration(i, i, i === context.length - 1);
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}
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}
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function iterateObject(context) {
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var priorKey,
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key;
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for (key in context) {
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if (context.hasOwnProperty(key)) {
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// We're running the iterations one step out of sync so we can detect
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// the last iteration without have to scan the object twice and create
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// an itermediate keys array.
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if (priorKey) {
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execIteration(priorKey, i - 1);
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}
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priorKey = key;
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i += 1;
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}
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}
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if (priorKey) {
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execIteration(priorKey, i - 1, true);
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}
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}
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if (context && typeof context === 'object') {
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if (hbsUtils.isArray(context)) {
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iterateArray(context);
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} else {
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iterateObject(context);
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}
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}
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if (i === 0) {
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ret = inverse(this);
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}
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return ret;
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};
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module.exports = foreach;
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