frontend | 易学教程

store.getState or mapStateToProps in Component

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问题 I have a question that what is the difference between use getState from store directly or use mapStateToProps. Please look at me example below import React, { Component } from 'react' import store from '../store' import { connect } from 'react-redux'; class Test extends Component { constructor(props) { super(props); } render() { return ( <p> <h1>{this.props.count}</h1> <h2>{store.getState().reducer1.count}</h2> </p> ) } } const mapStateToProps = (state) => ({ count: state.reducer1.count }); /

How to limit number of columns of card-deck?

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问题 This is my code, what I want to achieve is only four columns in a row, and no more or less than that, but currently, the number of cards range from 1-10, they keep compressing until 10. <div class="card-deck-wrapper"> <div class="card-deck"> @foreach($resource->projects as $project) <div class="card card-project"> bla bla (every card let's say is like this) </div> @endforeach </div> </div> 回答1: As explained in the docs, Card layouts (decks, groups and columns)... "For the time being, these

Vue.js—Difference between v-model and v-bind

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问题 I'm learning Vue with an online course and the instructor gave me an exercise to make an input text with a default value. I completed it using v-model but, the instructor chose v-bind:value and I don't understand why. Can someone give me a simple explanation about the difference between these two and when it's better use each one? 回答1: From here - Remember: <input v-model="something"> is essentially the same as: <input v-bind:value="something" v-on:input="something = $event.target.value" > or

Can I change font size based on the number of letters? [duplicate]

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问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Auto-size dynamic text to fill fixed size container I have a box which displays the username. However I found that it can only fit 10 letters - I use the standard h1 font size. Is there a way to change the font-size according to the number of letters? My usernames range from 3 to 10 characters. 回答1: Please try the code below. <html> <head> <script src="http://code.jquery.com/jquery-latest.js"></script> <script

Access Front end works fine for most users but one user keeps having a variety of problems

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问题 I have a handful of MS Access 2010 databases that are used to keep track of various things for my group. Each Database has a dedicated back end and each user has a local copy of the front end (*.accdr) and 2010 access runtime. Only three of us have full versions of Access. Each DB has up to 6 users and some users have multiple DB's they use regularly. One user in particular has multiple problems with these DB's. One of them has a form where you put criteria in some text boxes, click a button

Synchronizing “Frontend” and “Backend” in Java (and SWT)

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问题 Edit: So the code is actually working fine - all objects are modified as they should be. It's only the surface that seems to have issues updating itself while the method is still running... I'm working on a project atm which is basically about solving a Sokoban-riddle. Now, we've implemented both the GUI and the algorithm stuff to solve the riddle, but the connection seems to be tricky. For example, in the GUI I choose "solve" and the algorithm solves the riddle (visible in the console), but

How to get picture to align with the left set of paragraphs/go to right of?

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问题 Here is a prototype of what I am trying to implement Here is what I currently have : JsFiddle I am trying to get the picture of the guy on the laptop to align correctly with and to the right of the paragraph components - Business Traveller, Office Supply Purchases, etc... What I've tried is using Align attribute, changing my img src code to <img id="laptop" align="middle" src="zoom-39988392-3.JPG" height = "90" width ="90" /> but that didn't have any effect. I also tried Float but that messed

How to ensure that the hibernate version number stays immutable in a javascript client?

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问题 I have a Rest backend with Java and Hibernate and im using Optimistic Locking with the version property. For concurrency control, this version property must go to the client and again to the server with post request. But, in a javascript client i lose control over the integrity of this property, for example: A client "A" requests the resource 1. A client "B" requests the same resource. The server responds with resource 1 version 1 to both clients (in their respective responses) The client "A"

Find a sentence in an html page displayed in the browser and Highlight it [duplicate]

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问题 This question already has an answer here : Highlighting an html document expression in Asp.net mvc using JavaScript (1 answer) Closed 2 years ago . I'm using asp.net mvc to display a .html document that I know exactly what it contains. I have this method in my controller: public ActionResult GetHtmlPage(string path) { return new FilePathResult(path, "text/html"); } and I have this Simple view: @{ ViewBag.Title = "ManageDocument"; } <h2>ManageDocument</h2> @Html.Action("GetHtmlPage",

how to put a button on top between two dives?

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问题 I want to make a design like this using css, but i don't know how to put this button on top between two div s, can anyone help me? <div></div> button <div></div> 回答1: You can also use negative margin-top to pull your element up. 回答2: Make the button style position: absolute; and define the right and top or bottom properties. If you want the button to be fixed while scrolling, set position: fixed; #up{ background-color:#B7005D; height:10vh; width:100%; } #middle{ background-color:#E0E1E0;