What is a form? A Web form can send user-entered data to the server for processing. Because Internet users use checkboxes, radio buttons, or text fields to fill out a form, the WebForms form resembles a file or database. For example, WebForms can be used to order products that enter shipping or credit card information, or can be used to retrieve data (for example, search on search engines). <!--from wiki - > simply to collect information from users This is the workflow of a form form: The user opens the page- > After filling out the form and submitting it according to the appropriate way to send server--server received after the transfer to the appropriate program processing infrastructure:<form></form> Add table cell element <input> form input tag syntax under form: <input type= "" Name= "" ....../> attribute: name: First Name, The server uses the name recognition group, the same group needs the same name name maxlength: Specifies the maximum length of the input size: The size of the text box, in characters, the default is 20 value: Default value, content submitted to server placeholder: Prompt text type: text: Enter text, properties: password: Password box, automatically hide password file: Upload file, display content related to browser radio: Radio box, Options that require a single selection require the same name, return value to the server to identify what is selected, and add checked to determine the default options. checkbox: check box, similar to the radio rule. button: With JS to provide action, value bit button display content &NBSP;SUBM: Submit button, with JS will be a foThe form within RM is sent to the server, the value bit button displays content reset: Restores the form's forms to the default state, the value values bit button displays the contents hidden: Hidden Fields, The user does not see the value passed to the server. image: Image domain submission, same as submit function, SRC Place image address. <select> drop-down menu and list label syntax <option> selected content </option> Option Property: Size: The number of displays, greater than 1 o'clock, is displayed as a list. Multiple: Ctrl + multiple selection, drop-down menu variable list selected: Default option Rico add <optgroup> Group name </optgroup> to group options <textarea> </textarea> multiline text fields Basically, as with <input> text, the cols and rows properties are more. Row controls the number of rows displayed, cols the width of the display. Form Properties action: The destination, URL, or server file that the form is sent to. method: Specify how the form is sent to the server with Get, post two methods, get by default get: Use URL to pass parameters (the returned URL can see the contents of the form), there is a limit on the number of messages sent, generally used for user information acquisition. POST: The form data is part of the HTTP request content and has no limit on the number of messages sent, and is typically used to modify resources on the server. name: The name of the form. traget: Where to open the action URL parameter: _blank, _self, _parent, _top Enctype: How to encode the form before sending it, parameters are: 1: Default mode application/x-www-form-urlencoded 2:multipart/form-data 3:text/plain
HTML Learning Note 8: Forms
