首先重写 marionette ItemView 构造函数并像这样渲染(如果您想在 CollectionView 和 CompositeView 中使用它,也重写它们的这些方法):
var fnCons = Marionette.ItemView.prototype.constructor,
fnRender = Marionette.ItemView.prototype.render;
Marionette.ItemView.prototype.constructor = function(){
this.firstRender = true;
fnCons.apply(this,arguments);
}
Marionette.ItemView.prototype.render = function(){
this.firstRender = false;
fnRender.apply(this,arguments);
}
然后只需覆盖默认区域#show,如果视图是view.firstRender
为 true 时,它尚未渲染并且必须渲染它,否则无需执行任何操作。
Marionette.Region.prototype.show = function(view){
this.ensureEl();
var isViewClosed = view.isClosed || _.isUndefined(view.$el);
var isDifferentView = view !== this.currentView;
if (isDifferentView) {
this.close();
}
// These lines changed from default marionette action
if(view.firstRender){
view.render();
}else{
// Don anything else!
}
// End of overrided code
if (isDifferentView || isViewClosed) {
this.open(view);
}
this.currentView = view;
Marionette.triggerMethod.call(this, "show", view);
Marionette.triggerMethod.call(view, "show");
}
Edit
上面的解决方案工作正常,另一种方法是(这将假设视图已渲染):
Marionette.Region.prototype.showWithoutRender = function(view){
this.ensureEl();
var isViewClosed = view.isClosed || _.isUndefined(view.$el);
var isDifferentView = view !== this.currentView;
if (view !== this.currentView) {
this.close();
}
if(isViewClosed || isDifferentView){
this.open(view);
}
this.currentView = view;
Marionette.triggerMethod.call(this, "show", view);
Marionette.triggerMethod.call(view, "show");
}