我有两个组件。一个有一个表单，另一个有导航，当单击导航按钮时，我需要访问该表单以确保它在继续下一步之前进行验证。但是，当我尝试从另一个组件访问表单时，该表单始终是未定义的。是否可以从另一个组件访问表单，如果可以，我该如何实现这一点？
Here's my sample code in plunker
Index.html
<!DOCTYPE html>
<html>
<head>
<script data-require="angularjs@1.5.8" data-semver="1.5.8" src="https://opensource.keycdn.com/angularjs/1.5.8/angular.min.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
</head>
<body ng-app="app">
<form-component></form-component>
<nav-component></nav-component>
</body>
</html>
script.js
// Code goes here
function checkForm(form) {
if (form) {
if (form.$valid) {
alert("Form is valid!");
}
else
{
alert("Form is invalid!");
}
}
else {
alert("FAILED! Form is undefined!");
}
}
function formController() {
var model = this;
model.goToNextStep = function(form) {
model.form = form;
checkForm(form);
};
}
function navController() {
var model = this;
model.goToNextStep = function(form) {
model.form = form;
checkForm(form);
};
}
var app = angular.module("app", []);
app.component("formComponent", {
template: `
<div class="container">
<form name="mainForm">
<p>When you click the button that exists in the same component
as the form, everything works fine.\
</p>
<input type="text" name="test123" value="THIS IS A TEST" />
<button type="button" ng-click="model.goToNextStep(mainForm);">
Submit Form
</button>
</form>
<br /><strong>formComponent model:</strong> <pre>{{model | json }}</pre>
</div>
`,
controllerAs: "model",
controller: [formController]
});
app.component("navComponent", {
template: `
<div class="container">
<p>When you click the button that does NOT exist in the same
component as the form, it doesn't work.
</p>
<button type="button" ng-click="model.goToNextStep(mainForm);">Submit Form</button>
<br /><br /><strong>navComponent model:</strong>
<pre>{{model | json }}</pre>
</div>
`,
controllerAs: "model",
controller: [navController]
});
最佳答案
一种方法是将两个组件嵌套在 ng-form element 中:
<ng-form name="top">
<form-component top-form="top"></form-component>
<nav-component top-form="top"></nav-component>
</ng-form>
并使用单向 <绑定(bind)将两者连接到顶部表单:
app.component("formComponent", {
bindings: {topForm: "<"},
template: `
<div class="container">
<form name="mainForm">
<p>When you click the button that exists in the same component as the form, everything works fine.</p>
<input type="text" name="test123" value="THIS IS A TEST" />
<button type="button" ng-click="model.goToNextStep(model.topForm);">Submit Form</button>
</form>
<br /><strong>formComponent model:</strong> <pre>{{model | json }}</pre>
</div>
`,
controllerAs: "model",
controller: [formController]
});
app.component("navComponent", {
bindings: {topForm: '<'},
template: `
<div class="container">
<p>When you click the button that does NOT exist in the same component as the form, it doesn't work.</p>
<button type="button" ng-click="model.goToNextStep(model.topForm);">Submit Form</button>
<br /><br /><strong>navComponent model:</strong> <pre>{{model | json }}</pre>
</div>
`,
controllerAs: "model",
controller: [navController]
});
关于javascript - 从另一个不同的 AngularJS 组件访问表单(用于验证)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45494399/