非常简单。
当用户单击“提交”时,我需要将表单序列化,并将JSON数据显示在类“调试”中。
如何使用当前的Javascript执行此操作?
无法使用jQuery。无法编辑HTML。只有纯Javascript。
谢谢!
的HTML
<ol class="household"></ol>
<form>
<div>
<label>Age
<input type="text" name="age">
</label>
</div>
<div>
<label>Relationship
<select name="rel">
<option value="">---</option>
<option value="self">Self</option>
<option value="spouse">Spouse</option>
<option value="child">Child</option>
<option value="parent">Parent</option>
<option value="grandparent">Grandparent</option>
<option value="other">Other</option>
</select>
</label>
</div>
<div>
<label>Smoker?
<input type="checkbox" name="smoker">
</label>
</div>
<div>
<button class="add">add</button>
</div>
<div>
<button type="submit">submit</button>
</div>
</form>
</div>
<pre class="debug"></pre>
JS
function validate(form) {
fail = validateAge(form.age.value)
fail += validateRel(form.rel.value)
if (fail == "") return true
else {
alert(fail);
return false
}
}
function validateAge(field) {
if (isNaN(field)) return "No age was entered. \n"
else if (field < 1 || field > 200)
return "Age must be greater than 0. \n"
return ""
}
function validateRel(field) {
if (field == "") return "Please select a relationship \n"
return ""
}
document.querySelector("form").onsubmit = function() {
return validate(this)
}
document.querySelector(".add").onclick = function(event) {
event.preventDefault();
createinput()
}
count = 0;
function createinput() {
field_area = document.querySelector('.household')
var li = document.createElement("li");
var p1 = document.createElement("p");
var p2 = document.createElement("p");
var p3 = document.createElement("p");
var x = document.getElementsByName("age")[0].value;
var y = document.getElementsByName("rel")[0].value;
var z = document.getElementsByName("smoker")[0].checked;
if (!z) {
z = "Non smoker \n";
} else {
z = "Smoker \n";
}
p1.innerHTML = x;
p2.innerHTML = y;
p3.innerHTML = z;
li.appendChild(p1);
li.appendChild(p2);
li.appendChild(p3);
field_area.appendChild(li);
//removal link
var removalLink = document.createElement('a');
removalLink.onclick = function() {
this.parentNode.parentNode.removeChild(this.parentNode)
}
var removalText = document.createTextNode('Remove Field');
removalLink.appendChild(removalText);
li.appendChild(removalLink);
count++
}
// serialize form
var data = {};
var inputs = [].slice.call(e.target.querySelector('form'));
inputs.forEach(input => {
data[input.name] = input.value;
});
最佳答案
当我申请相同的职位时,我对这种形式非常了解。这是您使用纯js的答案!
var peopleList = [];
var addButton = document.querySelector('button.add');
var submitButton = document.querySelector('button[type=submit]');
var debug = document.querySelector('pre.debug');
var mainForm = document.forms[0];
var ageFormField = mainForm.age;
var relationshipFormField = mainForm.rel;
var smokerFormField = mainForm.smoker;
var positionFormField=mainForm.position;
//Taken from https://www.inventpartners.com/open-source/free-web-software/javascript_is_int
function is_int(value) {
if ((parseFloat(value) == parseInt(value)) && !isNaN(value)) {
return true;
} else {
return false;
}
}
function formIsValid() {
return ageFormField.value != '' && is_int(ageFormField.value) && relationshipFormField.selectedIndex != 0 && positionFormField.value !='';
}
function updateDebug() {
if (peopleList.length != 0) {
debug.innerText = JSON.stringify(peopleList);
debug.setAttribute('style', 'display: block');
submitButton.disabled = false;
} else {
debug.innerText = '';
debug.removeAttribute('style');
submitButton.disabled = true;
}
}
function addEventClick(event) {
event.preventDefault();
if (formIsValid()) {
peopleList.push({
'age': ageFormField.value,
'position':positionFormField.value,
'relationship': relationshipFormField.options[relationshipFormField.selectedIndex].value,
'isSmoker': smokerFormField.checked,
});
updateDebug();
ageFormField.value = '';
positionFormField.value='';
relationshipFormField.selectedIndex = 0;
smokerFormField.checked = false;
} else {
var errors = '';
if (ageFormField.value == '') {
errors += 'Please enter your age!';
} else if (!is_int(ageFormField.value)) {
errors += 'Age must be a numeric value!';
}
if (relationshipFormField.selectedIndex == 0) {
if (errors != '') {
errors += '\n';
}
errors += 'Please select your relationship status!';
}
if (positionFormField.value == '') {
if (errors != '') {
errors += '\n';
}
errors += 'Please enter your position!';
}
if (errors != '') {
alert(errors);
errors = '';
}
else if (
errors != '') {
alert(errors);
errors = '';
}
}
}
function submitEventClick(event) {
event.preventDefault();
if (peopleList.length != 0) {
var http = new XMLHttpRequest();
var url = "savePeopleList.php";
http.open('POST', url, true);
http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
http.onreadystatechange = function() {
if (http.readyState == 4) {
if (http.status == 200) {
peopleList = [];
updateDebug();
alert('All of the changes were saved to the server!');
} else {
alert('An error occured while sending the data to the server!');
}
}
};
http.send(JSON.stringify(peopleList));
}
}
addButton.addEventListener('click', addEventClick, false);
submitButton.addEventListener('click', submitEventClick, false);
updateDebug();
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Household builder</title>
<style>
.debug {
font-family: monospace;
border: 1px solid black;
padding: 10px;
display: none;
}
</style>
</head>
<body>
<h1>Household builder</h1>
<div class="builder">
<ol class="household"></ol>
<form>
<div>
<label>Age
<input type="text" name="age">
</label>
</div>
<div>
<label>Position
<input type="text" name="position">
</label>
</div>
<div>
<label>Relationship
<select name="rel">
<option value="">---</option>
<option value="self">Self</option>
<option value="spouse">Spouse</option>
<option value="child">Child</option>
<option value="parent">Parent</option>
<option value="grandparent">Grandparent</option>
<option value="other">Other</option>
</select>
</label>
</div>
<div>
<label>Smoker?
<input type="checkbox" name="smoker">
</label>
</div>
<div>
<button class="add">add</button>
</div>
<div>
<button type="submit">submit</button>
</div>
</form>
</div>
<pre class="debug"></pre>
<script type="text/javascript" src="./index.js"></script>
</body>
</html>