[英]Dynamic tag with angularjs directive
我想在angularjs中創建一個元素指令,它從作為屬性傳遞的json blob生成一個html元素。 我嘗試了以下幾種變體......
demoApp.directive("element", function() {
return {
restrict: "E",
scope: {
attributes: "@",
name: "@"
},
template:
function(name, attributes) {
var templateString = "<" + attributes.tag;
for (attribute in attributes) {
if (attribute != "name_displayed" && attribute != "tag") {
templateString += " " + attribute + "=\"" attributes[attribute] + "\"";
}
}
templateString += " name=\"" field + "\"";
templateString += ">";
templateString += "</" + attributes.tag + ">";
return attributes.name_displayed + ": " + templateString;
}(name, attributes)
};
});
html看起來像
<div ng-repeat="(name, attributes) in fields">
<element name="{[{name}]}" attributes="{[{attributes}]}"></element>
</div>
json對象的屬性是什么樣的
{"name_displayed":"Agency","size":"30","tag":"input","type":"text"}
一個名字看起來像
agency
看起來我不能將函數用於模板,看起來我也無法訪問屬性或名稱對象。
您可以在link
功能而不是template
實現邏輯。 嘗試這個:
HTML
<element ng-repeat="field in fields" />
JavaScript的
angular.module('demo', []).
controller('demoCtrl', ['$scope', function($scope) {
$scope.fields = [{
"tag": "input",
"type": "text",
"value": "Demo app",
"name": "my_input",
"label": "My Text"
}, {
"tag": "input",
"type": "checkbox",
"checked": "checked",
"name": "my_checkbox",
"label": "My Checkbox"
}, {
"tag": "input",
"type": "button",
"value": "Click Me",
"name": "my_button"
}];
}]).
directive('element', function() {
return {
restrict: "E",
replace: true,
template: "<div></div>",
link: function(scope, element, attrs) {
var label,
el,
key,
field;
field = scope.field;
if('label' in field) {
label = document.createElement('label');
label.innerHTML = field.label;
element.append(label);
element.append(document.createTextNode(': '));
}
el = document.createElement(field.tag);
for(key in field) {
if(field.hasOwnProperty(key) && // avoid prototype properties
key !== 'tag' && // avoid tag
key !== 'label' && // avoid label
key[0] !== '$' // avoid angular staff derived from scope
) {
el.setAttribute(key, field[key]);
}
}
element.append(el);
}
};
});
這是一個工作示例: http : //plnkr.co/edit/B1RigXrzA2l1kIVNVXGw?p = preview
看看這個: http : //jsfiddle.net/es4Y6/1/
var app = angular.module('hmm', []);
function ctrl($scope) {
$scope.fields = {
first: '{"name_displayed": "Agency", "size": "30", "tag": "input", "type": "text"}',
second: '{"name_displayed": "Foo", "size": "30", "tag": "input", "type": "password"}',
third: '{"name_displayed": "Bar", "size": "30", "tag": "input", "type": "number"}'
};
}
app.directive('blah', function() {
var template = function(name, attributes) {
var templateString = "<" + attributes.tag;
for (var attribute in attributes) {
if (attribute != "name_displayed" && attribute != "tag") {
templateString += " " + attribute + '="' + attributes[attribute] + '"';
}
}
templateString += ' name="' + name + '"';
templateString += ">";
templateString += "</" + attributes.tag + ">";
return attributes.name_displayed + ": " + templateString;
};
return {
restrict: "E",
link: function(scope, element, attrs){
var attributes = angular.fromJson(attrs.attributes);
var tpl = template(attrs.name, attributes);
element.html(tpl);
}
};
});
我假設“json blob”是指json字符串。 如果沒有,那么你的意思是JS對象。 在這種情況下,更新$scope.fields
並刪除angular.fromJson()
。
<div ng-app="hmm">
<div ng-controller="ctrl">
<div ng-repeat="(name, attributes) in fields">
<blah name="{{name}}" attributes="{{attributes}}"></blah>
</div>
</div>
</div>
它有效,但是對於你想要解決的問題來說,這是一個非常糟糕的方法。
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