dropdown | 易学教程

Shared drop-down list for multiple ComboBoxes (each item in the list can be occupied singly)

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问题 I need to recreate a shared drop-down list selection where each item can be picked only by one control at a time. The closest example I can think of is player's color selection in games like Generals and Age of Empires (multiplayer). For example, there is a list: {"- None -", "Blue", "Red", "Yellow", etc.} There are four ComboBoxes. Each of them starts as "- None -". If ComboBoxA takes "Blue", no other ComboBox should have "Blue" in their list. Though ComboBoxA still should have "Blue" in its

Drop Down with sqlite - Flutter

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问题 I have database sqlite data and i want to show my data in drop down with changed id of my rows in table because in future i want to create another drop down to change to value of first drop down anyone can help ? 回答1: Working with SQLite on flutter To gather the data from a SQLite database you could use the sqflite plugin (independently if is an iOS or Android device). You have to add the dependency to your pubspec.yaml . dependencies: ... sqflite: any When you want to use sqflite you have to

How to omit hidden options from Dropdown using selenium

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问题 If we use the selenium code Select sel = new Select(ele); eles = sel.getOptions(); it will returns all element of dropdown options and we can get the value. But if some options of dropdown are in hidden state and if we use the same Select.getOptions(), it will return the all options including the hidden options. Code: <select id="userType" > <option value="administrator">Administrator</option> <option value="instructor">Instructor</option> <option class="studenthide" value="student" style=

How to show selected value from database in dropdown using Laravel?

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问题 I want to show selected value from database into dropdown list on page load. My controller index function is : public function index() { $country_data =DB::table('country')->select('country_id','country_name')->get(); $profile_data= DB::table('profiles')->select('*')->where('id',$user_id)->first(); return view('profile_update',compact('profile_data','country_data')); } Column name in database for height is :Height My dropdown in profile_update.blade.php is <select class="select4" name=

Is there an equivalent widget in flutter to the “select multiple” element in HTML

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问题 I am searching for a widget in flutter that is equal to <select multiple=""></select> in flutter. An example implementation (for the web) is MaterializeCSS Select Multiple As seen above I should be able to provide a list of items (with some of them preselected) and at the end retrieve a list of selected items or a map or something else. An example implementation or a link to a documentation is very appreciated. 回答1: I don't think that a widget like that currently exists in Flutter, but you

CSS/HTML: How to add a dropdown menu to existing navbar?

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问题 Hey guys can anyone help me I need this dropdown menu in my existing navbar. The dropdown menu should be on the right hand site of the navbar. please! This is the html body part: <body> <ul class="topnav"> <li><a class="active" href="#home">Home</a></li> <li><a href="#news">News</a></li> <li><a href="#contact">Contact</a></li> <li><a href="#about">About</a></li> <li class="dropdown, right"> <a href="javascript:void(0)" class="dropbtn">Dropdown</a> <div class="dropdown-content"> <a href="#"

Vehicle drop down selector

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问题 Chasing some help on this one, unfortunately Javascript is not my forte; I am creating a simple drop down vehicle make, model and year selector which leads through to a link which is created dynamically depending on the users options selected. Effectively the user should be able to select a make and then have a model show up which is associated with that make and finally a year that is associated with the model selected. I have been able to get the make and model selection to work but when I

Chart.js jQuery dropdown selected values

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问题 Hello :) (I'm novice and I learn on the job), I work with Chart.js, jQuery, PostgreSQL Currently I have a bar chart directly linked to PostgreSQL database. I'd like to add a dropdown to allow the user to select a "zone", which would dynamically update the chart. Each "zone" has different variables: population, salaries (number of employees in english), etc. Here is the PHP <?php $dbconn = pg_connect("") or die('Erreur de connexion'.pg_last_error()); $query = "SELECT id, zone_nom, zone_pop,

Angular editable dropdown - make editable based on selected value

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问题 UPDATE 1: developed the first sample code to set the basis for correct implementation. UPDATE 2: developed a working model. See answers. I found this library: https://libraries.io/bower/editable-dropdown-angularjs which allows adding editable dropdown list using HTML5 datalist feature. It works fine, however, the only needed feature is to make the field editable only if the selected value is "Other". See working sample in plunkr.co vreated based on the demo from the repository http://plnkr.co

Symfony dependent dropdown with 3 entities

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问题 So I'm about to create a form with three dropdowns which are interdependent. When one or several channel1s are selected, the choices for channel 3 should change, according to what is selected for channel1. And dependent on that, the last dropdown "agencies" should change its choices. I've already tried different solutions but none of them has worked so far. Right now I'm stuck on the solution provided by Symfony's documentation, which provides code for two entities but even with that one, my