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|
+++
title = "Inline Validation"
template = "demo.html"
+++
This example shows how to do inline field validation, in this case of an email address. To do this
we need to create a form with an input that `POST`s back to the server with the value to be validated
and updates the DOM with the validation results.
We start with this form:
```html
<h3>Signup Form</h3>
<form hx-post="/contact">
<div hx-target="this" hx-swap="outerHTML">
<label>Email Address</label>
<input name="email" hx-post="/contact/email" hx-indicator="#ind">
<img id="ind" src="/img/bars.svg" class="htmx-indicator"/>
</div>
<div class="form-group">
<label>First Name</label>
<input type="text" class="form-control" name="firstName">
</div>
<div class="form-group">
<label>Last Name</label>
<input type="text" class="form-control" name="lastName">
</div>
<button class="btn primary">Submit</button>
</form>
```
Note that the first div in the form has set itself as the target of the request and specified the `outerHTML`
swap strategy, so it will be replaced entirely by the response. The input then specifies that it will
`POST` to `/contact/email` for validation, when the `changed` event occurs (this is the default for inputs).
It also specifies an indicator for the request.
When a request occurs, it will return a partial to replace the outer div. It might look like this:
```html
<div hx-target="this" hx-swap="outerHTML" class="error">
<label>Email Address</label>
<input name="email" hx-post="/contact/email" hx-indicator="#ind" value="test@foo.com">
<img id="ind" src="/img/bars.svg" class="htmx-indicator"/>
<div class='error-message'>That email is already taken. Please enter another email.</div>
</div>
```
Note that this div is annotated with the `error` class and includes an error message element.
This form can be lightly styled with this CSS:
```css
.error-message {
color:red;
}
.error input {
box-shadow: 0 0 3px #CC0000;
}
.valid input {
box-shadow: 0 0 3px #36cc00;
}
```
To give better visual feedback.
Below is a working demo of this example. The only email that will be accepted is `test@test.com`.
<style>
.error-message {
color:red;
}
.error input {
box-shadow: 0 0 3px #CC0000;
}
.valid input {
box-shadow: 0 0 3px #36cc00;
}
</style>
{{ demoenv() }}
<script>
//=========================================================================
// Fake Server Side Code
//=========================================================================
// routes
init("/demo", function(request, params){
return demoTemplate();
});
onPost("/contact", function(request, params){
return formTemplate();
});
onPost(/\/contact\/email.*/, function(request, params){
var email = params['email'];
if(!/\S+@\S+\.\S+/.test(email)) {
return emailInputTemplate(email, "Please enter a valid email address");
} else if(email != "test@test.com") {
return emailInputTemplate(email, "That email is already taken. Please enter another email.");
} else {
return emailInputTemplate(email);
}
});
// templates
function demoTemplate() {
return `<h3>Signup Form</h3><p>Enter an email into the input below and on tab out it will be validated. Only "test@test.com" will pass.</p> ` + formTemplate();
}
function formTemplate() {
return `<form hx-post="/contact">
<div hx-target="this" hx-swap="outerHTML">
<label for="email">Email Address</label>
<input name="email" id="email" hx-post="/contact/email" hx-indicator="#ind">
<img id="ind" src="/img/bars.svg" class="htmx-indicator"/>
</div>
<div class="form-group">
<label for="firstName">First Name</label>
<input type="text" class="form-control" name="firstName" id="firstName">
</div>
<div class="form-group">
<label for="lastName">Last Name</label>
<input type="text" class="form-control" name="lastName" id="lastName">
</div>
<button type='submit' class="btn primary" disabled>Submit</button>
</form>`;
}
function emailInputTemplate(val, errorMsg) {
return `<div hx-target="this" hx-swap="outerHTML" class="${errorMsg ? "error" : "valid"}">
<label>Email Address</label>
<input name="email" hx-post="/contact/email" hx-indicator="#ind" value="${val}" aria-invalid="${!!errorMsg}">
<img id="ind" src="/img/bars.svg" class="htmx-indicator"/>
${errorMsg ? (`<div class='error-message' >${errorMsg}</div>`) : ""}
</div>`;
}
</script>
|
