在指令中自定义模板 [英] Customizing the template within a Directive

问题描述

我有一个使用Bootstrap标记的表单，如下所示：

I have a form that is using markup from Bootstrap, like the following:

<form class="form-horizontal">
  <fieldset>
    <legend>Legend text</legend>
    <div class="control-group">
      <label class="control-label" for="nameInput">Name</label>
      <div class="controls">
        <input type="text" class="input-xlarge" id="nameInput">
        <p class="help-block">Supporting help text</p>
      </div>
    </div>
  </fieldset>
</form>

那里有很多样板代码，我想减少到新的指令 - 表格输入，如下所示：

There's a lot of boilerplate code in there, that I'd like to reduce to a new directive - form-input, like follows:

<form-input label="Name" form-id="nameInput"></form-input>

生成：

   <div class="control-group">
      <label class="control-label" for="nameInput">Name</label>
      <div class="controls">
        <input type="text" class="input-xlarge" id="nameInput">
      </div>
    </div>

我通过一个简单的模板工作了这么多。

I have this much working via a simple template.

angular.module('formComponents', [])
    .directive('formInput', function() {
        return {
            restrict: 'E',
            scope: {
                label: 'bind',
                formId: 'bind'
            },
            template:   '<div class="control-group">' +
                            '<label class="control-label" for="{{formId}}">{{label}}</label>' +
                            '<div class="controls">' +
                                '<input type="text" class="input-xlarge" id="{{formId}}" name="{{formId}}">' +
                            '</div>' +
                        '</div>'

        }
    })

然而，当我来添加更高级的功能时我已经卡住了。

However it's when I come to add in more advanced functionality that I'm getting stuck.

我' d喜欢在我的指令中公开type参数作为可选属性，例如：

I'd like to expose the "type" parameter as an optional attribute on my directive, eg:

<form-input label="Password" form-id="password" type="password"/></form-input>
<form-input label="Email address" form-id="emailAddress" type="email" /></form-input>

但是，如果没有指定，我想默认为文本。我该如何支持？

However, if nothing is specified, I'd like to default to "text". How can I support this?

我也希望能够支持必需属性，如果它存在的话。
例如：

I'd also like to be able to support the "required" attribute, if it's present. Eg:

<form-input label="Email address" form-id="emailAddress" type="email" required/></form-input>

如果指令中存在 ，我想将它添加到输出中生成的< input /> ，否则忽略它。我不确定如何实现这一点。

If required is present in the directive, I'd like to add it to the generated <input /> in the output, and ignore it otherwise. I'm not sure how to achieve this.

我怀疑这些要求可能超出了简单的模板，并且必须开始使用预编译阶段，但我我不知道从哪里开始。

I suspect these requirements may have moved beyond a simple template, and have to start using the pre-compile phases, but I'm at a loss where to start.

推荐答案

angular.module('formComponents', [])
  .directive('formInput', function() {
    return {
        restrict: 'E',
        compile: function(element, attrs) {
            var type = attrs.type || 'text';
            var required = attrs.hasOwnProperty('required') ? "required='required'" : "";
            var htmlText = '<div class="control-group">' +
                '<label class="control-label" for="' + attrs.formId + '">' + attrs.label + '</label>' +
                    '<div class="controls">' +
                    '<input type="' + type + '" class="input-xlarge" id="' + attrs.formId + '" name="' + attrs.formId + '" ' + required + '>' +
                    '</div>' +
                '</div>';
            element.replaceWith(htmlText);
        }
    };
})

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