Detect if data in form was changed

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I have Angular form (not reactive), with data binded in ngModel:

 <form #form="ngForm">
  <input [(ngModel)]="user.name">
  <input [(ngModel)]="user.color">

  <button type="submit">Save</button>
 </form>

How can i disable submit button if binded data has not been changed?

do this , check for dirty flag, which tells form dirty or not

 <button type="submit"  [disabled]="!form.dirty">Save</button>

form becomes dirty if you change some value in it.

Check here for detail : https://angular.io/guide/forms

Generic way to detect if html form is edited, In pure javascript, this would not be an easy task, but jQuery makes it very easy to do: $("#myform :input").change(function() { $("#myform").data("changed",true); });. The general idea is to store the initial value of the form as separate object (just cloning it). And then create a boolean function which simply iterate through the key-values and compare Updated data with the Initial data. After this just bind the result of this function to your submit button [disabled]="yourCheckMethod(form.value)".

According to your comment 'But what if i erase 1 symbol in input and then wright it again (the value is the same, but form was changed)?' I suggest this solution.

The general idea is to store the initial value of the form as separate object (just cloning it). And then create a boolean function which simply iterate through the key-values and compare Updated data with the Initial data. After this just bind the result of this function to your submit button [disabled]="yourCheckMethod(form.value)".

How to Check That an HTML Form Has Been Changed, However, today we'll discuss how to check whether the user has changed form data. Why Check for Form Updates? There are many reasons why  I am very new to PowerApps and have been working on my first project. I need to set up a function to send an email when a user changes any field on a form. I now have the form set up and the Save Icon works. I have figured out how to send the email and it all works well. However I have little doubt

You can try it with the pristine property like this:

<button type="submit" [disabled]="form.pristine">Save</button>

This property checks if your form has changed since it was loaded.

How to Write a Generic Form Update Detection Function in , This allows us to determine which fields have changed or, if the array is empty, The function will return NULL if no form could be found. This would allow the server-side code to skip field validation and database updates: i need to detect change in multiple control, and fire a sub procedure when any of the mention control value changes in a form. example of the controls include checkbox textbox NumericUpDown the problem here is that i have upto 50 controls in all on the form, how do i do this?

Detect Unsaved Changes in Angular Forms, If the user changes the data and leave the page without saving, a pop-up window is displayed, warning that there is unsaved data on the page, in order to prevent  Detect Changes in Data Values. Stateflow ® charts can detect changes in the values of data between time steps. You can use change detection operators to determine when a variable changes to or from a value. To generate an implicit local event when the chart sets the value of a variable, use the change operator.

Generically detecting changed fields in a custom form prior to saving , Treat a field that has a different number of values between the two versions as a change. Iterate through every field, value, and column and compare the two  How to: Detect When Text in a TextBox Has Changed. This example shows one way to use the TextChanged event to execute a method whenever the text in a TextBox control has changed. In the code-behind class for the XAML that contains the TextBox control that you want to monitor for changes, insert a method to call whenever the TextChanged event fires.

Don't know the best way to check if form value has changed., Don't know the best way to check if form value has changed. Help Request ​unless I'm over thinking it, pretty knew to backend and saving data. Continue this​  When I Enable Detect Data Change options, the refresh in PwBI Desktop works fine, but when Publish in the service, there is no way I can refresh it. Here is 02 errors. and: Message: Resource name and Location need to match. When I come back to pwbi Desktop, disable Detect Data Change options, then publish again. Now I can refresh it in the service.

Comments
  • It would be cleaner to use reactive forms, then use form.pristine and form.dirty. angular.io/guide/reactive-forms
  • @ibenjelloun i can't use reactive from, because i need to bind value to models from server.
  • Reactive forms can do that.
  • But what if i erase 1 symbol in input and then wright it again (the value is the same, but form was changed)?
  • yes if you change value it becomes dirty, if you want to do like that then you need to write code , because there is no direct way for that