rerender

问题 Let's say we have a parent component and multiple functional child components. I want to clearly know if the parent re-renders does the child re-renders or not. After going through a few articles I came to know there are 3 ways we can detect rerenders. (Let me know if there are more ways.) 1. Put a console.log in the child component. 2. Use Chrome paint flashing option in the settings. 3. Use React dev tool Do all these ways are correct to know if the component really rerenders? Because it

问题 I define a scene: we have a component that uses parent's props and itself state. There are two Components DC and JOKER and my step under the below: click DC's button DC setCount JOKER will render with the old state running useEffect and setCount JOKER does render again I want to ask why JOKER render twice(step 3 and 5) and the first render squanders the performance. I just do not want step 3 . If in class component I can use componentShouldUpdate to avoid it. But Hooks has the same something?

问题 I have this code: Template.temp.rendered = function () { console.log('temp rendered'); } Which logs only when the website is initialized. But i do something like this: more = function () { Meteor.subscribe('Videos', Session.get('more_info')); } When i call more(); it does not log the "temp rendered" even though the template dom gets updated with the new documents. Also tried something like: Template.temp.rerendered = function () { console.log('temp re rendered'); } It does not work; How do I

问题 I have a JSF page on which I want to have a checkbox that, when clicked, will add/remove certain other form fields from the page. Here is the (simplified) code I currently have for the checkbox: <h:selectBooleanCheckbox title="showComponentToReRender" value="#{backingBean.showComponentToReRender}"> <a4j:support event="onsubmit" reRender="componentToReRender" /> </h:selectBooleanCheckbox> Here is the code for the component I want to hide: <h:selectOneMenu id="componentToReRender" value="#

问题 I'm using angular 7 with angular-datatables. I'm tring to define a "rerender" button in order to reload data like in this example. I don't understand what should I place in the render function: My API function: fn_getFavoriteTables() { this._getFavoriteTablesApiCall = this.getFavoriteTablesService.getFavoriteTables(Number(localStorage.getItem('UserID')), Number(localStorage.getItem('BranchID'))).pipe(takeUntil(this.destroySubject$)).subscribe(x => { this.getFavoriteTables = x; this.dtTrigger

问题 I'm trying to implement (as part of a larger system) a feature where a user is able to post a message. When the user clicks the post button, I'm using RichFaces and a4j to retrieve the generated post using ajax. I'd rather not have the post show up automatically as soon as the response is returned. Rather, I'd like to add an output panel inside a hidden div. When the user clicks on the post button, that output panel will be populated but obviously hidden from the user. What I would like to do

问题 I need to re-execute javascript just after form gets re-rendered. Simply, putting in javascript after XHTML content won't help since its a partial request. Also, I cannot use "onComplete" as the commandButton from which I am re-rendering form is in JSF component used at several places. I need to get the fix in locally. Is there any way? I was wondering whether f:ajax would help in this case. Please let me know, if anyone has clue about it. 回答1: Simplest way is to just put the JS function call

问题 After rendering the entire page based on several user contexts and having made several $http requests, I want the user to be able to switch contexts and re-render everything again (resending all $http requests, etc). If I just redirect the user somewhere else, things work properly: $scope.on_impersonate_success = function(response) { //$window.location.reload(); // This cancels any current request $location.path('/'); // This works as expected, if path != current_path }; $scope.impersonate =

问题 I have a view, which holds handlebars template. that template consist of another partial template. that partial template holds a list of results, which i am using in different parts of my app. anyhow, when trying to filter the results, i'd like to render only that part. meaning the backbone view should not render the whole view just the partial. can it be done? 回答1: Yes, it's possible. The easiest way is to execute the whole template as you do when rendering the complete view, but only

问题 Good Morning! Is it possible to reRender only 1 specific row of rich:dataTable? I have a rich:dataTable and, when I do something that I´m sure only 1 row has changed, I need to reRednder only this row, not the entire table. Is it possible? How? XHTML: <rich:dataTable id="myTable" value="#{bean.table}" var="me"> <rich:column> <h:outputText value="#{me.id}" /> </rich:column> <rich:column> <h:outputText value="#{me.valueOne}" /> </rich:column> <rich:column> <h:outputText value="#{me.valueTwo}" /