I have a two page form so I am trying to mix submitting data to the server as well as making use of vuex. So on page one, I have a simple form which contains a group of checkboxes (removed layout and styling to reduce code)
<b-form #submit.stop.prevent="onSubmit">
<b-form-group>
<input v-model="$v.form.checkboxGroup.$model" type="checkbox" name="checkbox1" value="1">
<input v-model="$v.form.checkboxGroup.$model" type="checkbox" name="checkbox2" value="2">
<input v-model="$v.form.checkboxGroup.$model" type="checkbox" name="checkbox3" value="3">
</b-form-group>
<button class="btn try-btn" type="submit">Submit</button>
</b-form>
Essentially, when submitted, I send the form data to my repository so it can be saved on the backend. If this is successful, I call the following method
handleSubmitSuccess (response) {
if (response.data.action === 'next_step') {
this.$store.dispatch('createCheckboxData', this.$v.form.$model)
return
}
}
This method sets the checkbox data in my store and routes the user to the next page (removed this part). So all of this is fine, seems to work well.
So when on page two, I have a button that can take you back to page one. My idea is that if this happens, I use the previously checked data in the store to auto check the previously selected checkbox. As such, on page one I added a computed method
computed: {
checkboxData () {
return this.$store.getters.checkboxData
}
}
Now if I output checkboxData to the console, it seems to be an Observer object
[{…}, __ob__: Observer]
0:
checkboxData: Array(2)
0: "1"
1: "3"
length: 2
So the above shows that previously, the first and second checkboxes were checked.
My question is how can I now use this data to auto-check my checkboxes. I have seen some examples online, but they do not seem to work.
Thanks
The way you use Vue is a little different to me so you might have to change this but, basically, you can set your v-model to whatever array is set in the Vuex store and it will set those checkboxes to true:
new Vue({
el: "#app",
data: {
checkbox: [],
vuexData: ['1', '3']
},
mounted() {
this.checkbox = this.vuexData;
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<input v-model="checkbox" type="checkbox" name="checkbox1" value="1">
<input v-model="checkbox" type="checkbox" name="checkbox2" value="2">
<input v-model="checkbox" type="checkbox" name="checkbox3" value="3">
{{ checkbox }}
</div>
Related
I am a newbie to VueJs
I would like to use Vue2 to create a validation form
Index.html
<div id="app">
<form action='process.php' method="post" name="submit_form" id="submit_form" v-on:submit="validateForm">
<label for="username">Name</label>
<input type="text" name="username" v-model="username" placeholder="Username"/>
<br><br>
<input class="submit_button" name="submit_form" type="submit" value="Submit">
</form>
</div>
but When I click the previous or next page, then back to index.html form page.
The input field's data is auto-remove.
How to using keep-alive in vuejs to save user input?
Is there any simple example?
Thank you very much
When you click on the previous or next page (I think you mean the browser's arrows) the page it's reloaded, so the javascript (and vue) too. To keep the data, you must "save" the form's state. A simple solution can be to save the form object in sessionStorage and check if there is a sessionStorage Item (let's say with a key 'formData') and fill the form object with these values.
Example:
<html>
...
<body>
<div id="app">
<form action='process.php' method="post" name="submit_form" id="submit_form" v-on:submit="validateForm" v-on:change="saveFormDataState">
<label for="username">Name</label>
<input type="text" name="username" v-model="formData.username" placeholder="Username"/>
<br><br>
<input class="submit_button" name="submit_form" type="submit" value="Submit">
</form>
</div>
<script>
new Vue({
el: '#app',
data: () => ({
formData: {
username: ''
}
}),
methods: {
initFormDataState(){
const formData = JSON.parse(sessionStorage.getItem('formData') || '');
if(formData){
this.formData = formData;
}
},
saveFormDataState(){
const formData = JSON.stringify(this.formData);
sessionStorage.setItem('formData', formData);
}
},
created(){
this.initFormDataState();
}
});
</script>
</body>
</html>
Note that I have added the on-change listener to the form to save the form's state when the user focuses on another input element or presses the submit button.
I'm having trouble binding radiobuttons to boolean values in model.
In this example: https://jsfiddle.net/krillko/npv1snzv/2/
On load, the radio radio button is not checked, and when I try to change them, the 'primary' value in model is becomes empty.
I've tried:
:checked="variation.primary == true"
but with no effect.
To bind radio buttons to boolean values instead of string values in Vue, use v-bind on the value attribute:
<input type="radio" v-model="my-model" v-bind:value="true">
<input type="radio" v-model="my-model" v-bind:value="false">
I'll leave it to you to figure out how to match these values with your backend data.
Checkboxes are not so good for this scenario; the user could leave them both blank, and you don't get your answer. If you are asking a yes/no or true/false question where you want only one answer, then you should be using radio buttons instead of checkboxes.
What you are looking for is a checkbox. Here is an updated jsfiddle.
Your use case is not how radio buttons are supposed to work.
Look at this example.
new Vue({
el: '#app',
data: {
picked: 'One',
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.1/vue.js"></script>
<div id="app">
<input type="radio" id="one" value="One" v-model="picked">
<label for="one">One</label>
<br>
<input type="radio" id="two" value="Two" v-model="picked">
<label for="two">Two</label>
<br><br>
<span>Picked: {{ picked }}</span>
</div>
I ran into this myself too, the thing to remember is that the value attribute actually shouldn't change for the radio button, what changes (and what you need to bind to) is the checked attribute.
And then you need to handle the change event to set the correct item's value in your data.
Based on your jsFiddle, I think this is what you're looking for:
<div id="l-main">
<div v-for="(variation, key) in variations">
<label>
{{ variation.name }}
<input
type="radio"
name="Test"
:value="key"
:checked="variation.primary"
#change="onChange"
/>
</label>
</div>
<br>Output:<br>
<div v-for="(variation, key) in variations">
{{ variation.name }} {{ variation.primary }}
</div>
</div>
var vm = new Vue({
el: '#l-main',
data: {
variations: {
'41783' : {
'name': 'test1',
'primary': false
},
'41785' : {
'name': 'test2',
'primary': true
}
}
},
methods: {
onChange($event) {
// the primary variation is the one whose key
// matches the value of the radio button that got checked
for (const key in this.variations) {
this.variations[key].primary = key === $event.target.value;
}
}
}
});
I am creating a set of radio buttons in Aurelia with the code like this:
<div repeat.for="option of options">
<input type="radio" id="${option}_id" name="radio_options" model.bind="option" checked.bind="optionValue"/>
<label for="${option}_id" id="${option}_label">${option}</label>
</div>
However, doing it this way I discovered that model.bind is not working - the optionValue in corresponding class is not populated when radio button is checked. Similarly when some value is assigned to optionValue in the class, the appropriate radio button is not checked. I found this happening only with repeater. Options are numbers in my case. Could you please help me to find out what may be wrong here?
The first problem is that model.bind should be used when working with objects. Since you're working with a primitive type, you should use value.bind instead.
The second problem is that input values are always strings, so when setting an initial value, it must be a string. For example:
Html:
<template>
<div repeat.for="option of options">
<input type="radio" id="${option}_id" name="radio_options" value.bind="option" checked.bind="optionValue"/>
<label for="${option}_id" id="${option}_label">${option}</label>
</div>
<p>Selected Option: ${optionValue} </p>
</template>
JS:
export class App {
options = [ 1, 2, 3, 4 ]
optionValue = '3';
}
If you really want to use int in your view-model, you can create a ValueConverter to convert the value to int when passing it to/from the view. For instance:
export class AsIntValueConverter {
fromView(value) {
return Number.parseInt(value);
}
toView(value) {
return value.toString();
}
}
Usage:
<input type="radio" id="${option}_id" name="radio_options" value.bind="option" checked.bind="optionValue | asInt"/>
Running Example https://gist.run/?id=1465151dd5d1afdb7fc7556e17baec35
When my form is submitted I wish to get an input value:
<input type="text" id="name">
I know I can use form input bindings to update the values to a variable, but how can I just do this on submit. I currently have:
<form v-on:submit.prevent="getFormValues">
But how can I get the value inside of the getFormValues method?
Also, side question, is there any benefit to doing it on submit rather than updating variable when user enters the data via binding?
The form submit action emits a submit event, which provides you with the event target, among other things.
The submit event's target is an HTMLFormElement, which has an elements property. See this MDN link for how to iterate over, or access specific elements by name or index.
If you add a name property to your input, you can access the field like this in your form submit handler:
<form #submit.prevent="getFormValues">
<input type="text" name="name">
</form>
new Vue({
el: '#app',
data: {
name: ''
},
methods: {
getFormValues (submitEvent) {
this.name = submitEvent.target.elements.name.value
}
}
}
As to why you'd want to do this: HTML forms already provide helpful logic like disabling the submit action when a form is not valid, which I prefer not to re-implement in Javascript. So, if I find myself generating a list of items that require a small amount of input before performing an action (like selecting the number of items you'd like to add to a cart), I can put a form in each item, use the native form validation, and then grab the value off of the target form coming in from the submit action.
You should use model binding, especially here as mentioned by Schlangguru in his response.
However, there are other techniques that you can use, like normal Javascript or references. But I really don't see why you would want to do that instead of model binding, it makes no sense to me:
<div id="app">
<form>
<input type="text" ref="my_input">
<button #click.prevent="getFormValues()">Get values</button>
</form>
Output: {{ output }}
</div>
As you see, I put ref="my_input" to get the input DOM element:
new Vue({
el: '#app',
data: {
output: ''
},
methods: {
getFormValues () {
this.output = this.$refs.my_input.value
}
}
})
I made a small jsFiddle if you want to try it out: https://jsfiddle.net/sh70oe4n/
But once again, my response is far from something you could call "good practice"
You have to define a model for your input.
<input type="text" id="name" v-model="name">
Then you you can access the value with
this.name inside your getFormValues method.
This is at least how they do it in the official TodoMVC example: https://v2.vuejs.org/v2/examples/todomvc.html (See v-model="newTodo" in HTML and addTodo() in JS)
Please see below for sample solution, I combined the use of v-model and "submitEvent" i.e. <input type="submit" value="Submit">. Used submitEvent to benefit from the built in form validation.
<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/vue"></script>
</head>
<body>
<div id="app">
<form #submit.prevent="getFormValues">
<div class="form-group">
<input type="email" class="form-control form-control-user"
v-model="exampleInputEmail"
placeholder="Enter Email Address...">
</div>
<div class="form-group">
<input type="password" class="form-control"
v-model="exampleInputPassword" placeholder="Password"> </div>
<input type="submit" value="Submit">
</form>
</div>
<script>
const vm = new Vue({
el: '#app',
methods: {
getFormValues (submitEvent) {
alert("Email: "+this.exampleInputEmail+" "+"Password: "+this.exampleInputPassword);
}
}
});
</script>
</body>
</html>
The other answers suggest assembling your json POST body from input or model values, one by one. This is fine, but you also have the option of grabbing the whole FormData of your form and whopping it off to the server in one hit. The following working example uses Vue 3 with Axios, typescript, the composition API and setup, but the same trick will work anywhere.
I like this method because there's less handling. If you're old skool, you can specify the endpoint and the encoding type directly on the form tag.
You'll note that we grab the form from the submit event, so there's no ref, and no document.getElementById(), the horror.
I've left the console.log() there to show that you need the spread operator to see what's inside your FormData before you send it.
<template>
<form #submit.prevent="formOnSubmit">
<input type="file" name="aGrid" />
<input type="text" name="aMessage" />
<input type="submit" />
</form>
</template>
<script setup lang="ts">
import axiosClient from '../../stores/http-common';
const formOnSubmit = (event: SubmitEvent) => {
const formData = new FormData(event.target as HTMLFormElement);
console.log({...formData});
axiosClient.post(`api/my-endpoint`, formData, {
headers: {
"Content-Type": "multipart/form-data",
}
})
}
</script>
I am trying to make a radio button checked using vuejs v-for only if my if-statement is true. Is there a way to use vuejs' v-if/v-else for this type of problem?
in php and html I can achieve this by doing the following:
<input type="radio" <? if(portal.id == currentPortalId) ? 'checked="checked"' : ''?>>
Below is what I have so far using vuejs:
<div v-for="portal in portals">
<input type="radio" id="{{portal.id}}" name="portalSelect"
v-bind:value="{id: portal.id, name: portal.name}"
v-model="newPortalSelect"
v-on:change="showSellers"
v-if="{{portal.id == currentPortalId}}"
checked="checked">
<label for="{{portal.id}}">{{portal.name}}</label>
</div>
I know the v-if statement here is for checking whether to show or hide the input.
Any help would be very much appreciated.
You could bind the checked attribute like this:
<div v-for="portal in portals">
<input type="radio"
id="{{portal.id}}"
name="portalSelect"
v-bind:value="{id: portal.id, name: portal.name}"
v-model="newPortalSelect"
v-on:change="showSellers"
:checked="portal.id == currentPortalId">
<label for="{{portal.id}}">{{portal.name}}</label>
</div>
Simple example: https://jsfiddle.net/b4k6tpj9/
Maybe someone finds this approach helpful:
In template I assign each radio button a value:
<input type="radio" value="1" v-model.number="someProperty">
<input type="radio" value="2" v-model.number="someProperty">
Then in the component I set the value, i.e:
data: function () {
return {
someProperty: 2
}
}
And in this case vue will select the second radio button.
You can follow below option if you can adjust with your logic:
<div class="combination-quantity">
<input type="radio" value="Lost"
v-model="missing_status">
<label for="lost">Lost</label>
<br>
<input type="radio" value="Return Supplier" v-model="missing_status">
<label for="return_supplier">Return Supplier</label>
</div>
Value for missing_status could be "Lost" or "Return Supplier" and based on the value radio option will be get selected automatically.
Below is an example of keeping track of the selected radiobutton, by
applying a value binding to the object (:value="portal") and
applying a v-model binding to the currently selected object (v-model="currentPortal").
The radiobutton will be checked automatically by Vue, when the two match (no :checked binding necessary!).
Vue 3 with composition API
Vue.createApp({
setup() {
const portals = [{
id: 1,
name: "Portal 1"
}, {
id: 2,
name: "Portal 2"
}];
const currentPortal = portals[1];
return {
portals,
currentPortal
}
}
}).mount("#app");
<script src="https://unpkg.com/vue#next"></script>
<div id="app">
<template v-for="portal in portals">
<input
type="radio"
:id="portal.id"
name="portalSelect"
:value="portal"
v-model="currentPortal">
<label :for="portal.id">{{portal.name}}</label>
</template>
</div>
I would like to point out a few options when dealing with radios and vue.js. In general if you need to dynamically bind an attribute value you can use the shorthand binding syntax to bind to and calculate that value. You can bind to data, a computed value or a method and a combination of all three.
new Vue({
el: '#demo',
data() {
return {
checkedData: false,
checkedGroupVModel: "radioVModel3", //some defaul
toggleChecked: false,
recalculateComputed: null
};
},
computed: {
amIChecked() {
let isEven = false;
if (this.recalculateComputed) {
let timeMills = new Date().getMilliseconds();
isEven = timeMills % 2 === 0;
}
return isEven;
}
},
methods: {
onToggle() {
this.toggleChecked = !this.toggleChecked;
return this.toggleChecked;
},
mutateComputedDependentData() {
this.recalculateComputed = {};
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.16/vue.min.js"></script>
<div id="demo">
<div>
<div>
<span>Simple Radio Group - Only one checked at a time. Bound to data.checkedData</span><br>
<label>Radio 1 - inverse of checkedData = {{!checkedData}}
<input type="radio" name="group1" value="radio1" :checked="!checkedData">
</label><br>
<label>Radio 2 - checkedData = {{checkedData}}
<input type="radio" name="group1" value="radio2" :checked="checkedData">
</label><br>
<span>Understanding checked attribute: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-checked</span>
</div>
<br>
<div>
<span>Simple Radio - Checked bouned to semi-random computed object</span><br>
<label>Radio 1: {{amIChecked}}
<input type="radio" :checked="amIChecked">
</label>
<label>Recalculate Computed Value
<button type="button" #click="mutateComputedDependentData">Click Me Several Times</button>
</label>
</div>
<br>
<div>
<span>Simple Radio Group - v-model bound value = {{checkedGroupVModel}}</span><br>
<label>Simple Radio 1:
<input type="radio" name="vModelGroup" value="radioVModel1" v-model="checkedGroupVModel">
</label><br>
<label>Simple Radio 2:
<input type="radio" name="vModelGroup" value="radioVModel2" v-model="checkedGroupVModel">
</label><br>
<label>Simple Radio 3:
<input type="radio" name="vModelGroup" value="radioVModel3" v-model="checkedGroupVModel">
</label>
</div>
<br>
<div>
<span>Simpe Radio - click handler to toggle data bound to :checked to toggle selection</span><br>
<label>Toggle Radio = {{toggleChecked}}
<input type="radio" :checked="toggleChecked" #click='onToggle()'>
</label>
</div>
</div>
</div>