CODEWITHSUNDEEP
htmlspringspring-mvcthymeleaf
Tobou
Tobou

Reputation: 501

How to set thymeleaf th:field value from other variable

I have a simple text input field where i have to set default value from one object and save its final value in other. The following code is not working.

<div th:object="${form}">
    <input class="form-control"
           type="text"
           th:value="${client.name}"  //this line is ignored
           th:field="*{clientName}"/>
</div>

form is DTO object and client is Entity object from database.

What is the correct way to solve this situation?

By not working I mean - lets say that initial values are client.name="Foo" and form.clientName=null. I need that input field display value is "Foo" and after form submission form.clientName value to become "Foo". But the input field displays nothing and on submission form.clientName value still is null;

If anyone is interested, solved this issue using following structure (found the answer in another question).

th:attr="value = ${client.name}"

Upvotes: 49

Views: 218131

Answers (7)

Ivan Ivanov
Ivan Ivanov

Reputation: 11

 <form method="post"  th:action="@{'/details-view/'+ ${id}}">
 <fieldset>
   <div th:each="params: ${form.getHtmlNameType()}">
       <label>
           <span th:text="${params[0]}"></span>

          <input  th:field="${__${'form.'+params[1]}__}"  th:name="${params[1]}" th:type="${params[2]}"   >

       </label>
   </div>
   <input th:type="'hidden'"  th:value="${originalReferer}" name="originalReferer" >
  </fieldset>
  <button type="post" >Save</button>
</form>

Upvotes: 0

JavaEddie
JavaEddie

Reputation: 21

Ok, if I am understanding the question correctly, you are trying to assign a predetermined value to a variable and then populate that variable into the html form when it is rendered by Thymeleaf. If this is what you are asking, I have been struggling with this as well for a couple of days and just found the answer after reading your post, and thought that I would share.

What I was doing (hopefully this helps someone) was trying to automatically assign a value to the id of my blog post so that when the user submits it, the blog post would automatically get that ID which I wanted to assign.

*** Problem I faced *** When I assigned the id variable like this { th:field="*{id}" }, the output was always "0" in the form input box. So I tried a variety of different way to address this like adding a th:value, and a th:name, which always resulted in the big fat "0".

So, after lots of beating my head in, and searching through forums coming up short, I found this little nugget of joy.

https://frontbackend.com/thymeleaf/hidden-inputs-in-thymeleaf

Although it did not address my specific issue, the answer was in there. Im not gonna make you read it for yourself, cause I hate that.

**** THE ANSWER ***

{In the HTML form}

 <input class="form-control" type="text" id="blog-id"  th:field="*{id}">

{In the controller}

@GetMapping("/") public String display(Model model) {

   // Create the object first 
    BlogPost blogPost = new BlogPost();

   // Then add assign the value to object
    blogPost.setId( Value You Want To Add );

   // Then send the object that you added the id to as the attribute
    model.addAttribute("blogPost", blogPost);



    return "postBlog";
}

*** Conclusion *** I cut down my code to just what you needed to see (before all the haters start in). This was my solution and it worked flawlessly. No we all know how to fix the problem

Cheers! JavaEddie

Upvotes: 2

Saulid Snake
Saulid Snake

Reputation: 1

So what you need to do is replace th:field with th:name and add th:value, th:value will have the value of the variable you're passing across.

<div class="col-auto">
        <input type="text" th:value="${client.name}" th:name="clientName" 
        class="form control">
</div>

Upvotes: 0

Julien Feniou
Julien Feniou

Reputation: 1004

If you don't have to come back on the page with keeping form's value, you can do that : 

<form method="post" th:action="@{''}" th:object="${form}">
    <input class="form-control"
           type="text"
           th:field="${client.name}"/>

It's some kind of magic :

  • it will set the value = client.name
  • it will send back the value in the form, as 'name' field. So you would have to change your form field, 'clientName' to 'name'

If you matter keeping you form's input values, like a back on the page with an user input mistake, then you will have to do that :

<form method="post" th:action="@{''}" th:object="${form}">
    <input class="form-control"
           type="text"
           th:name="name"
           th:value="${form.name != null} ? ${form.name} : ${client.name}"/>

That means :

  • The form field name is 'name'
  • The value is taken from the form if it exists, else from the client bean. Which matches the first arrival on the page with initial value, then the forms input values if there is an error.

Without having to map your client bean to your form bean. And it works because once you submitted the form, the value arn't null but "" (empty)

Upvotes: 2

Tamb
Tamb

Reputation: 748

The correct approach is to use preprocessing

For example

th:field="*{__${myVar}__}"

Upvotes: 11

Petr Kloza
Petr Kloza

Reputation: 53

It has 2 possible solutions:

1) You can set it in the view by javascript... (not recomended) 

<input class="form-control"
       type="text"
       id="tbFormControll"
       th:field="*{clientName}"/>

<script type="text/javascript">
        document.getElementById("tbFormControll").value = "default";
</script>

2) Or the better solution is to set the value in the model, that you attach to the view in GET operation by a controller. You can also change the value in the controller, just make a Java object from $client.name and call setClientName.

public class FormControllModel {
    ...
    private String clientName = "default";
    public String getClientName () {
        return clientName;
    }
    public void setClientName (String value) {
        clientName = value;
    }
    ...
}

I hope it helps.

Upvotes: -3

Newbie
Newbie

Reputation: 1531

You could approach this method.

Instead of using th:field use html id & name. Set value using th:value

<input class="form-control"
           type="text"
           th:value="${client.name}" id="clientName" name="clientName" />

Hope this will help you

Upvotes: 65

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