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69 lines
2.3 KiB
JavaScript
69 lines
2.3 KiB
JavaScript
'use strict';
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(function(window, document, ion) {
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// Loop through each element in the DOM and collect up all
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// the templates it has. A template either has data to supply
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// to others, or it needs data from another template
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function initTemplates() {
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var
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x,
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el,
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tmp,
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emptyTemplates = [],
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container,
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templateElements;
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// collect up all the templates currently in the DOM
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templateElements = document.body.querySelectorAll("[data-template]");
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for(x=0; x<templateElements.length; x++) {
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el = templateElements[x];
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if(el.dataset.template && !el.tSet) {
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// this element is either supplying template
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// data or it needs to be filled with template data
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if(el.innerHTML == "") {
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// this element is requesting to have its innerHTML
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// built from a template already set
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emptyTemplates.push(el);
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} else {
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// this element contains innerHTML which should be used
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// as a template for other elements. Save this template
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// data for future use.
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// Save only in sessionStorage, which maintains a storage area that's
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// available for the duration of the page session. A page session
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// lasts for as long as the browser is open and survives over page
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// reloads and restores. Opening a page in a new tab or window will
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// cause a new session to be initiated.
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sessionStorage.setItem("t:" + el.dataset.template, el.outerHTML);
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}
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// remember that this is set so we don't bother doing all this
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// code again for the same element in the future
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el.tSet = true;
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}
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}
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// go through each empty template and build it up with existing template data
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for(x=0; x<emptyTemplates.length; x++) {
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el = emptyTemplates[x];
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tmp = sessionStorage.getItem("t:" + el.dataset.template);
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if(tmp) {
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// we've got template data, plug it into this element's innerHTML
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container = document.createElement("div");
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container.innerHTML = tmp;
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el.parentNode.replaceChild(container.children[0].cloneNode(true), el);
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}
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}
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}
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ion.on("ready", initTemplates);
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ion.on("pagecreate", initTemplates);
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})(this, document, ion = this.ion || {});
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