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November 10, 2020 13:24
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Reactive Ajax Components for Rails
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<div> | |
<%= project.name %> | |
</div> |
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export class AjaxComponent { | |
constructor(componentLoadEvent="component:load", componentTag="ajax-component") { | |
this.pageReadyEvent = "turbolinks:load" //"DOMContentLoaded" | |
this.componentLoadEvent = componentLoadEvent | |
this.componentTag = componentTag | |
this.loadComponentDataSelector = "data-load-component" | |
this.splitter = "->" | |
} | |
preloadComponents(preloadAttribute="preload") { | |
const selector = this.componentTag + "[" + preloadAttribute + "]" | |
document.querySelectorAll(selector).forEach(function(item, index) { | |
updateAjaxComponent(item.getAttribute("id"), false) | |
}) | |
} | |
setupComponentLoadTriggers(callback){ | |
var selector = "[" + this.loadComponentDataSelector + "]" | |
var instance = this; | |
document.querySelectorAll(selector).forEach(function(item, index) { | |
var triggers = item.getAttribute(instance.loadComponentDataSelector).split(instance.splitter) | |
item.removeEventListener(triggers[0], callback) | |
item.addEventListener(triggers[0], callback) | |
}) | |
} | |
updateAjaxComponent(e_id, broadcastToChannel = false) { | |
var element = document.getElementById(e_id) | |
if (!element) { | |
return | |
} | |
var url = element.getAttribute("src") | |
var method = element.getAttribute("method") | |
var instance = this | |
if (!method) { method = "GET" } | |
Rails.ajax({ | |
type: method, | |
url: url, | |
beforeSend: function( xhr ) { | |
xhr.setRequestHeader('Accept', 'text/ajax-component, */*') | |
return true | |
}, | |
complete: function(xhr, status) { | |
// update html | |
element.innerHTML = xhr.responseText | |
// if there are script tags, evaluate them by adding to head and removing it | |
instance.evaluateScriptTags(element) | |
Rails.fire(document, instance.componentLoadEvent) | |
if (broadcastToChannel){ | |
// we're gonna broadcast to channel | |
} | |
} | |
}) | |
} | |
evaluateScriptTags(element) { | |
var scriptElements = element.getElementsByTagName('SCRIPT'); | |
for (var i = 0; i < scriptElements.length; i ++) { | |
var scriptElement = document.createElement('SCRIPT'); | |
scriptElement.type = 'text/javascript'; | |
if (!scriptElements[i].src) { | |
scriptElement.innerHTML = scriptElements[i].innerHTML; | |
} else { | |
scriptElement.src = scriptElements[i].src; | |
} | |
document.head.appendChild(scriptElement).parentNode.removeChild(script) | |
} | |
} | |
} |
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<%= render @projects %> |
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<ajax-component id="projects_list" src="<%= projects_path %>" preload="true"></ajax-component> |
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import { AjaxComponent } from "./ajax_component" | |
window.ajax_updater = new AjaxComponent() | |
// CALL BACKS | |
window.ajaxUpdaterUpdateComponent = function(e) { | |
var triggers = this.getAttribute(ajax_updater.loadComponentDataSelector).split(ajax_updater.splitter); | |
ajax_updater.updateAjaxComponent(triggers[1]) | |
} | |
window.ajaxUpdaterSetupEventTriggers = function() { | |
ajax_updater.setupComponentLoadTriggers(ajaxUpdaterUpdateComponent) | |
} | |
window.ajaxUpdaterPreloadComponents = function() { | |
ajax_updater.preloadComponents() | |
} | |
window.updateAjaxComponent = function(element_id, broadcastToChannel = false) { | |
ajax_updater.updateAjaxComponent(element_id, broadcastToChannel) | |
} | |
// LISTENERS | |
document.addEventListener(ajax_updater.pageReadyEvent, ajaxUpdaterPreloadComponents) | |
document.addEventListener(ajax_updater.componentLoadEvent, ajaxUpdaterSetupEventTriggers) |
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updateAjaxComponet("projects_list") |
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Mime::Type.register "text/ajax-component", :component |
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