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e768a633b7
Summary: Ref T6953. Test Plan: `arc lint` Reviewers: epriestley, #blessed_reviewers Reviewed By: epriestley, #blessed_reviewers Subscribers: Korvin, epriestley Maniphest Tasks: T6953 Differential Revision: https://secure.phabricator.com/D11376
105 lines
3.3 KiB
JavaScript
105 lines
3.3 KiB
JavaScript
/**
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* Initialize a client-side view from the server. The main idea here is to
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* give server-side views a way to integrate with client-side views.
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*
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* The idea is that a client-side view will have an accompanying
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* thin server-side component. The server-side component renders a placeholder
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* element in the document, and then it will invoke this behavior to initialize
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* the view into the placeholder.
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*
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* Because server-side views may be nested, we need to add complexity to
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* handle nesting properly.
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*
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* Assuming a server-side view design that looks like hierarchical views,
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* we have to handle structures like
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*
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* <server:component>
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* <client:component id="1">
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* <server:component>
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* <client:component id="2">
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* </client:component>
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* </server:component>
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* </client:component>
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* </server:component>
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*
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* This leads to a problem: Client component 1 needs to initialize the behavior
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* with its children, which includes client component 2. So client component
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* 2 must be rendered first. When client component 2 is rendered, it will also
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* initialize a copy of this behavior. If behaviors are run in the order they
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* are initialized, the child component will run before the parent, and its
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* placeholder won't exist yet.
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*
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* To solve this problem, placeholder behaviors are initialized with the token
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* of a containing view that must be rendered first (if any) and a token
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* representing it for its own children to depend on. This means the server code
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* is free to call initBehavior in any order.
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*
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* In Phabricator, AphrontJavelinView demonstrates how to handle this correctly.
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*
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* config: {
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* id: Node id to replace.
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* view: class of view, without the 'JX.' prefix.
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* params: view parameters
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* children: messy and loud, cute when drunk
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* trigger_id: id of containing view that must be rendered first
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* }
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*
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* @provides javelin-behavior-view-placeholder
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* @requires javelin-behavior
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* javelin-dom
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* javelin-view-renderer
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* javelin-install
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*/
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JX.behavior('view-placeholder', function(config) {
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JX.ViewPlaceholder.register(config.trigger_id, config.id, function() {
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var replace = JX.$(config.id);
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var children = config.children;
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if (typeof children === 'string') {
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children = JX.$H(children);
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}
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var view = new JX[config.view](config.params, children);
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var rendered = JX.ViewRenderer.render(view);
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JX.DOM.replace(replace, rendered);
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});
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});
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JX.install('ViewPlaceholder', {
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statics: {
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register: function(wait_on_token, token, cb) {
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var ready_q = [];
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var waiting;
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if (!wait_on_token || wait_on_token in JX.ViewPlaceholder.ready) {
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ready_q.push({token: token, cb: cb});
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} else {
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waiting = JX.ViewPlaceholder.waiting;
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waiting[wait_on_token] = waiting[wait_on_token] || [];
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waiting[wait_on_token].push({token: token, cb: cb});
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}
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while(ready_q.length) {
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var ready = ready_q.shift();
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waiting = JX.ViewPlaceholder.waiting[ready.token];
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if (waiting) {
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for (var ii = 0; ii < waiting.length; ii++) {
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ready_q.push(waiting[ii]);
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}
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delete JX.ViewPlaceholder.waiting[ready.token];
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}
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ready.cb();
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JX.ViewPlaceholder.ready[token] = true;
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}
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},
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ready: {},
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waiting: {}
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}
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});
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