required

Explain why constructor inject is better than other options [duplicate]

由 时光总嘲笑我的痴心妄想 提交于 2019-11-26 19:35:42
This question already has an answer here: Setter DI vs. Constructor DI in Spring? 7 answers In a Pro Spring 3 Book, Chapter 4 - Introduction IOC and DI in Spring - Page 59, In "Setter Injection vs. Constructor Injection" section, a paragraph says Spring included, provide a mechanism for ensuring that all dependencies are defined when you use Setter Injection, but by using Constructor Injection, you assert the requirement for the dependency in a container-agnostic manner" Could you explain with examples A class that takes a required dependency as a constructor argument can only be instantiated

HTML5 Required input styling

由 杀马特。学长 韩版系。学妹 提交于 2019-11-26 11:26:15
问题 In HTML 5, we can mark inputs as required and then select them with the [required] pseudo-selector in CSS. But I only want to style them when they try to submit the form without filling out a required element. Is there a selector for this? How about for the little message box which pops up? 回答1: Yeah as SLaks said there is no CSS selector to do this. I would doubt this will ever be in the scope of CSS because CSS would need to check the contents of an input. Your best option, still, is

What is the difference between required and ng-required?

由 眉间皱痕 提交于 2019-11-26 09:15:23
问题 What is the difference between required and ng-required (form validation)? 回答1: AngularJS form elements look for the required attribute to perform validation functions. ng-required allows you to set the required attribute depending on a boolean test (for instance, only require field B - say, a student number - if the field A has a certain value - if you selected "student" as a choice ) As an example, <input required> and <input ng-required="true"> are essentially the same thing If you are

Explain why constructor inject is better than other options [duplicate]

由 老子叫甜甜 提交于 2019-11-26 06:59:55
问题 This question already has answers here : Setter DI vs. Constructor DI in Spring? (8 answers) Closed 2 years ago . In a Pro Spring 3 Book, Chapter 4 - Introduction IOC and DI in Spring - Page 59, In \"Setter Injection vs. Constructor Injection\" section, a paragraph says Spring included, provide a mechanism for ensuring that all dependencies are defined when you use Setter Injection, but by using Constructor Injection, you assert the requirement for the dependency in a container-agnostic

How to use the “required” attribute with a “radio” input field

由 你说的曾经没有我的故事 提交于 2019-11-26 00:19:28
问题 I am just wondering how to use the new HTML5 input attribute \"required\" the right way on radiobuttons. Does every radiobutton field need the attribute like below? Or is it sufficient if only one field gets it? <input type=\"radio\" name=\"color\" value=\"black\" required=\"required\" /> <input type=\"radio\" name=\"color\" value=\"white\" required=\"required\" /> 回答1: Set the required attribute for at least one input of the radio group. Setting required for all inputs is more clear, but not

Can I apply the required attribute to <select> fields in HTML5?

由 ＊爱你＆永不变心＊ 提交于 2019-11-25 23:44:18
问题 How can I check if a user has selected something from a <select> field in HTML5? I see <select> doesn\'t support the new required attribute... do I have to use JavaScript then? Or is there something I’m missing? :/ 回答1: Mandatory : Have the first value empty - required works on empty values Prerequisites : correct html5 DOCTYPE and a named input field <select name="somename" required> <option value="">Please select</option> <option value="one">One</option> </select> As per the documentation
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