Meteor 如何在每次触发按钮单击事件时调用助手函数

我有一个模板，在这个模板中，我试图通过一个助手函数调用button click来设置输入元素的值。第一次单击时一切正常，但第二次单击后，虽然调用了该函数，但在输入元素中并没有设置值。 下面是我的代码：

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

Registration.html ` 找到我的位置

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

---

助手是Blaze调用的一个函数，用于帮助它渲染数据。这不是你想要手动调用的东西。您真正要问的是：如何调用事件处理程序和助手的公共代码

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

有不同的方法可以做到这一点。最简单的方法是简单地将公共函数添加到文件范围中。e、 g

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

const commonFn = function() {
    return 5;
}

Template.foo.helpers({
    bar() {
        return commonFn();
    }
});

Template.foo.events({
    'click .baz': function() {
        return commonFn();
    }
});

另一种方法是将公共函数定义为模板的一部分，并将其分配给反应式var：

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

Template.foo.onCreated(function() {
    commonFn() {
        return 5;
    }

    this.common = new ReactiveVar(commonFn);
});

Template.foo.helpers({
    bar() {
        return Template.instance.common.get();
    }
});

Template.foo.events({
    'click .baz': function(event, template) {
        return template.common.get();
    }
});

---

助手是Blaze调用的一个函数，用于帮助它渲染数据。这不是你想要手动调用的东西。您真正要问的是：如何调用事件处理程序和助手的公共代码

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

有不同的方法可以做到这一点。最简单的方法是简单地将公共函数添加到文件范围中。e、 g

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

const commonFn = function() {
    return 5;
}

Template.foo.helpers({
    bar() {
        return commonFn();
    }
});

Template.foo.events({
    'click .baz': function() {
        return commonFn();
    }
});

另一种方法是将公共函数定义为模板的一部分，并将其分配给反应式var：

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

Template.foo.onCreated(function() {
    commonFn() {
        return 5;
    }

    this.common = new ReactiveVar(commonFn);
});

Template.foo.helpers({
    bar() {
        return Template.instance.common.get();
    }
});

Template.foo.events({
    'click .baz': function(event, template) {
        return template.common.get();
    }
});

---

模板帮助程序非常适合模板绑定，但是也可以手动调用它们

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

   Template.registerHelper('getCompanyName', function(companyId) {
return Meteor.CompanyHelper.getCompanyName(companyId) });

Meteor.CompanyHelper = {

getCompanyName: function(companyId) {
    var company = Companies.findOne({_id: companyId});
    if(company) {
        return company.name;
    }
}}

可以从任何代码直接调用上述帮助程序，如下所示：

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

Meteor.CompanyHelper.getCompanyName('CompanyId');

---

希望这能帮助您

模板帮助程序非常适合模板绑定，但也可以手动调用

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

   Template.registerHelper('getCompanyName', function(companyId) {
return Meteor.CompanyHelper.getCompanyName(companyId) });

Meteor.CompanyHelper = {

getCompanyName: function(companyId) {
    var company = Companies.findOne({_id: companyId});
    if(company) {
        return company.name;
    }
}}

可以从任何代码直接调用上述帮助程序，如下所示：

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`

Meteor.CompanyHelper.getCompanyName('CompanyId');

希望这对你有帮助

    <div class="form-group input-group" id="div_familyaddress">
      <span class="input-group-addon"><span class="glyphicon glyphicon-map-marker"></span></span>
      <input type="text" class="form-control" placeholder="Family Address" name="txt_address" id="txt_address" value = "{{location}}">
    </div>`