forms

问题 I have a user that has many accounts. I want to use a collection_select to have the user select which account they want to use. The select need to select among all the accounts assigned to the user in the user_accounts table, but the select needs to check the accounts table to get the name of the account that the drop down menu needs to display. #user.rb class Account < ActiveRecord::Base cattr_accessor :current_id belongs_to :owner, class_name: 'User' has_many :user_accounts has_many :users,

问题 I have a user that has many accounts. I want to use a collection_select to have the user select which account they want to use. The select need to select among all the accounts assigned to the user in the user_accounts table, but the select needs to check the accounts table to get the name of the account that the drop down menu needs to display. #user.rb class Account < ActiveRecord::Base cattr_accessor :current_id belongs_to :owner, class_name: 'User' has_many :user_accounts has_many :users,

问题 I want to validate this form and I have the javascript written but when I press submit it doesnt do anything. Only the pattern=[a-zA-Z] work function validation() { var name = document.getElementById('name').value; var surname = document.getElementById('surname').value; var message = document.getElementById('message').value; var email = document.getElementById('email').value; if (name == '' || surname == '' || message == '' || email == '') { document.getElementById("eresult").innerHTML = "All

问题 I have a simple form in a PHP application that I have to submit via POST method. Something like: <form action="URL?page_id=10" method="POST"> <select name="some_name" id="some_id"> <option value='1'>...</option> <option value='2'>...</option> ... </select> ... //submit button here </form> The goal is to go to the following URL on submit: URL?page_id=10&selected_id=SELECTED_ID where SELECTED_ID is the value chosen by the user from the select drop down menu in the form. I've done it by

问题 I'm using Angular4 tyring to associate ngValue to ngModel but getting Null . So kindly help me to connect ngValue to ngModel <select name="gender" [(ngModel)]="nameForm.gender"> <option [ngValue]="Male">Male</option> <option [ngValue]="Female">Female</option> <option [ngValue]="Others">Others</option> </select> 回答1: wrap around single quates 'Male' <select name="gender" [(ngModel)]="nameForm.gender"> <option [ngValue]="'Male'">Male</option> <option [ngValue]="'Female'">Female</option> <option

问题 The Docs says, to display the form fields in template, i need to do this: <form action="/search_for_book/">{% csrf_token %} {{form.as_p}} <input type="submit" value="Suchen" /> </form> i did this. and this is my views. def addbook(request): form = AddBook() return render(request,'searchbook.html',{'form':form}) this is my form. defined in forms.py and imported into views.py class AddBook(forms.Form): titel = forms.TextInput() author = forms.TextInput() why dont Form fields show up in template

问题 I run a landscape crew and instead of filling out our forms manually I would like to do it via cellphone and have the times auto-calculated in the form fields. I'm not familiar with JavaScript and need some assistance in getting the correct code in order to calculate the crew times and total site man-hours without this error when I change the times. Note: I will use 24-hour time. I tried a few different JavaScript snippets I discovered and though they work I am getting a format error when

问题 I have navigation stack like this: Page1 -> Page2 -> Page3 -> Page4 -> Page5 -> Page6 And I want to Navigate TO Page2 FROM Page6 and clear rest of pages (Page3, Page4, Page5) How can I do this? Thanks in advance! 回答1: When you want to navigate back a count of pages, you need to remove count pages from the navigation stack: for (var i = 1; i < countPagesToRemove; i++) { Navigation.RemovePage(Navigation.NavigationStack[Navigation.NavigationStack.Count - 2]); } await Navigation.PopAsync(); 来源：

问题 I have navigation stack like this: Page1 -> Page2 -> Page3 -> Page4 -> Page5 -> Page6 And I want to Navigate TO Page2 FROM Page6 and clear rest of pages (Page3, Page4, Page5) How can I do this? Thanks in advance! 回答1: When you want to navigate back a count of pages, you need to remove count pages from the navigation stack: for (var i = 1; i < countPagesToRemove; i++) { Navigation.RemovePage(Navigation.NavigationStack[Navigation.NavigationStack.Count - 2]); } await Navigation.PopAsync(); 来源：

问题 I am working my django projects based on html form submission method . But recently, I came to know that there exist django forms. Please let me know what is the difference between them. 回答1: Writing a form in Django will ultimately produce a HTML form. The Django form can be bound to a model which will then apply validation to the form based on the model structure, this saves on having to manually code the validation and also helps keep everything aligned when changes are made to the model.