placeholder | 易学教程

Adding placeholders to tkinter Entry widget in a procedural way

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来源： https://stackoverflow.com/questions/63651586/adding-placeholders-to-tkinter-entry-widget-in-a-procedural-way

IE 10, 11. How to prevent the triggering of input events on focus from text input with placeholder?

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问题 In IE 11 if I have an empty email input with a placeholder , then on clicking (focusing) it, the input event is being triggered. Does anyone know why and is there a solution to this, since the input value hasn't really changed? var el = document.getElementById('myEmail'); el.addEventListener("input", myFunction, true); function myFunction() { alert("changed"); } <input id="myEmail" type="email" placeholder="Email"> 回答1: I came very late to the party, but I had the same problem, and I came to

How to change placeholder of selectize.js dropdown?

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问题 I want to change placeholder of a dropdown created by selectize.js when the parent dropdown changes its selection to load the options of the dropdown whose placeholder to be changed. There is no method to do this in documentation. 回答1: Not sure if selectize keeps changing their code or if everyone else on this thread just whiffed but all of these answers seem to be wrong individually, but if you kind of combine the correct parts from each answer you wind up with this which works for me. var

Vim Ultisnips - How do I move to the next placeholder or tabstop?

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问题 I just installed a brand new copy of Macvim and UltiSnips, but I can't figure out how to move to the next completions using tabstops and placeholders. When I press tab, it simply adds a tab space. My guess is that the tab key was remapped in another plugin or vimrc, so I went with fresh installs and an empty ~/.vim folder. Still nothing... How do I move to the next tabstop? Is there a key mapping I can set? 回答1: I have the following in my vimrc : " Set ultisnips triggers let g

修改input，textarea 标签 placeholder的颜色和光标

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input, textarea { -webkit-tap-highlight-color: rgba(0, 0, 0, 0); //去除手机端点击的背景色 caret-color: #EE2B32;//光标 } input::-webkit-input-placeholder,textarea::-webkit-input-placeholder { color: #999999; font-weight: 500; } textarea:-moz-placeholder,input:-moz-placeholder { color: #999999; font-weight: 500; } textarea::-moz-placeholder,input::-moz-placeholder { color: #999999; font-weight: 500; } textarea:-ms-input-placeholder,input:-ms-input-placeholder { color: #999999; font-weight: 500; } 来源： https://www.cnblogs.com/jsgg/p/12642986.html

Tensorflow 创建神经网络

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一个神经网络系统，由很多层组成，输入层用来接收信息，中间层加工处理输入信息，输出层就是计算机对这个输入信息的认知。 https://www.jianshu.com/p/e112012a4b2d 搭建神经网络基本流程定义添加神经层的函数 1.训练的数据 2.定义节点准备接收数据 3.定义神经层：隐藏层和预测层 4.定义 loss 表达式 5.选择 optimizer 使 loss 达到最小然后对所有变量进行初始化，通过 sess.run optimizer，迭代 1000 次进行学习： import tensorflow as tf import numpy as np def add_layer(inputs,in_size,out_size,activation_fuction = None): Weight = tf.Variable(tf.random.normal([in_size,out_size])) biases = tf.Variable(tf.zeros([1,out_size])+0.1) wx = tf.matmul(inputs,Weight)+biases if activation_fuction is None: output = wx else : output = activation_fuction(wx) return output x

django进阶三

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Form django中的form一般有两种功能 1.输入html 2.验证用户输入 1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import re 4 from django import forms 5 from django.core.exceptions import ValidationError 6 7 8 def mobile_validate(value): 9 mobile_re = re.compile(r'^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$') 10 if not mobile_re.match(value): 11 raise ValidationError('手机号码格式错误') 12 13 14 class PublishForm(forms.Form): 15 16 user_type_choice = ( 17 (0, u'普通用户'), 18 (1, u'高级用户'), 19 ) 20 21 user_type = forms.IntegerField(widget=forms.widgets.Select(choices=user_type_choice, 22 attrs={'class': "form

tensorflow模型保存和使用08

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我们先定义一个简单的神经网络，用来训练模型，然后将模型保存下来，最后加载保存下来的模型进行检测，查看输出结果。 #模型训练和保存 import tensorflow as tf from tensorflow.examples.tutorials.mnist import input_data #载入数据集 mnist = input_data.read_data_sets("MNIST_data", one_hot=True) #每个批次100张照片 batch_size=100 #计算一共有多少个批次 n_batch=mnist.train.num_examples // batch_size #定义两个placeholder x=tf.placeholder(tf.float32, [None, 784]) y=tf.placeholder(tf.float32, [None, 10]) #创建一个简单的神经网络，输入层784个神经元，输出层10个神经元 W=tf.Variable(tf.zeros([784, 10])) b=tf.Variable(tf.zeros([10])) prediction=tf.nn.softmax(tf.matmul(x,W)+b) #二次代价函数 loss=tf.reduce_mean(tf.nn.softmax_cross_entropy

Could not resolve placeholder

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使用spring的<context:property-placeholder location="/WEB-INF/redis.properties"/>读取properties配置文件报错 Could not resolve placeholder 项目结构配置启动报错顺着这个错误向上找发现.properties文件没有全部加载, log4j.properties在web.xml中配置加载, jdbc.properties和redis.properties文件都配置在application.xml文件中, 从控制台上可以发现redis.properties文件并没有被加载 INFO: Set web app root system property: 'webapp.root' = [D:\soft\MyEclipse Professional2013workspace\.metadata\.me_tcat\webapps\zjx-springmvc\] 七月 24, 2016 12:16:29 上午 org.apache.catalina.core.ApplicationContext log INFO: Initializing log4j from [D:\soft\MyEclipse Professional2013workspace\.metadata\.me

抽屉新热榜

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1.实现与抽屉新热榜一样的布局 2.允许点赞、评论 3.开发登录、注册页面 4.开发发贴功能 index.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8">  <meta http-equiv="X-UA-Compatible" content="IE=edge">  <meta name="viewport" content="width=device-width, initial-scale=1">  <title>抽屉新热榜-聚合每日热门、搞笑、有趣资讯</title>   <link rel="stylesheet" href="./bootstrap-3.3.7/css/bootstrap.min.css