forms

Difference between modelAttribute and commandName attributes in form tag in spring?

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If you look at the source code of FormTag (4.3.x) which backs your <form> element, you’ll notice this /** * Set the name of the form attribute in the model. * <p>May be a runtime expression. */ public void setModelAttribute(String modelAttribute) { this.modelAttribute = modelAttribute; } /** * Get the name of the form attribute … Read more

Multiple forms in a single page using flask and WTForms

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The solution above have a validation bug, when one form cause a validation error, both forms display an error message. I change the order of if to solve this problem. First, define your multiple SubmitField with different names, like this: class Form1(Form): name = StringField(‘name’) submit1 = SubmitField(‘submit’) class Form2(Form): name = StringField(‘name’) submit2 = … Read more

How is mime type of an uploaded file determined by browser?

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Chrome Chrome (version 38 as of writing) has 3 ways to determine the MIME type and does so in a certain order. The snippet below is from file src/net/base/mime_util.cc, method MimeUtil::GetMimeTypeFromExtensionHelper. // We implement the same algorithm as Mozilla for mapping a file extension to // a mime type. That is, we first check a … Read more

Better Honeypot Implementation (Form Anti-Spam)

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Concept By adding a invisible field to your forms that only spambots can see, you can trick them into revealing that they are spambots and not actual end-users. HTML <input type=”checkbox” name=”contact_me_by_fax_only” value=”1″ style=”display:none !important” tabindex=”-1″ autocomplete=”off”> Here we have a simple checkbox that: Is hidden with CSS. Has an obscure but obviously fake name. … Read more

Preventing form resubmission

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There are 2 approaches people used to take here: Method 1: Use AJAX + Redirect This way you post your form in the background using JQuery or something similar to Page2, while the user still sees page1 displayed. Upon successful posting, you redirect the browser to Page2. Method 2: Post + Redirect to self This … Read more

How to trigger Form Validators in Angular2

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I don’t know if you are still looking for an answer, so here is my suggestions: Have a look at this: Angular 2 – AbstractControl I think what you could do is following: this.formGp.controls[‘checkboxFld’].valueChanges.observer({ next: (value) => { this.formGp.controls[‘numberFld’].updateValueAndValidity(); } }); This should trigger and run the validators. Furthermore the state gets updated as well. … Read more

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