<f:ajax render="@none" execute="@this"> 并减少提交的 post 大数据大小

<f:ajax render="@none" execute="@this"> and reducing submitted post data size in large form

我有一个巨大的 jsf 页面,其底层 ViewScopeBean 包含一个非常大的表单(包含近 100 个输入)和许多 ajax 化的输入字段。对于每个输入字段,我只提交当前值而不渲染任何内容。所以只是该表单中的示例字段:

<h:selectBooleanCheckbox id="includeForeignCurrencies" 
                         value="#{RatingManagerBean.formData.foreignCurrencies}"
                         action="#{RatingManagerBean.calculate}">

    <f:ajax render="@none" execute="includeForeignCurrencies"/> 

</h:selectBooleanCheckbox>

在 ajax post 之后我检查了例如firebug 中的开发人员工具并识别出 post 数据的提交大小高达 2 kb。然后我 select 该行,选择 "copy post data" 并将其粘贴到编辑器中:

该表单的每个字段都已提交,但我只对当前更改的字段感兴趣:

form-search=form-search
countryCode=AT
ratingType={"type":"COUNTRY"}
averageRating
minAmount
maxAmount
averageAmount
company
location
staffResponsible
staffResponsible2
requestDate
reminderDate
acutalCurrency
compareCurrencies   

 //70 other empty form-ids....

includeForeignCurrencies=on

javax.faces.ViewState=1825148886808299106:-354534052529224349
javax.faces.source=includeForeignCurrencies
javax.faces.partial.event=click
javax.faces.partial.execute=includeForeignCurrencies
javax.faces.behavior.event=valueChange
javax.faces.partial.ajax=true

有没有办法减少像这样的 posted 数据:

includeForeignCurrencies=on

javax.faces.ViewState=1825148886808299106:-354534052529224349
javax.faces.source=includeForeignCurrencies
javax.faces.partial.event=click
javax.faces.partial.execute=includeForeignCurrencies
javax.faces.behavior.event=valueChange
javax.faces.partial.ajax=true

甚至只是

includeForeignCurrencies=on

提前致谢!

解决方法:

作为一种可能的解决方法,我想出了禁用所有未触发 post 的输入并在 ajax 完成后重新启用它们。 post 数据大小现在是 200 B,而不是 2000 B。

因为我不确定这是否会导致任何其他问题,这是问题的更新,而不是答案。

<h:selectBooleanCheckbox id="includeForeignCurrencies" 
                     value="#{RatingManagerBean.formData.foreignCurrencies}"
                     action="#{RatingManagerBean.calculate}"
                     onclick="prepareAjaxPost(this)">

<f:ajax render="@none" execute="includeForeignCurrencies" onevent="ajaxPostComplete"/> 

</h:selectBooleanCheckbox>

javascript/jQuery:

function prepareAjaxPost(source){   

   //keep already disabled inputs disabled
   $("#form-search :input:not(:disabled)").filter(function() {      

        return !this.id.match(/javax.faces.ViewState/); //all inputs ignoring jsf- viewstate ones

    }).each(function(){
          var input = $(this);
          var others = input.not(source); 
          others.attr("disabled", true);
          others.addClass("blocked"); //some style that has no visual effect for users

    });
}

function ajaxPostComplete(data) {
    switch (data.status) {      
        case "success": {

           $("#form-search :input.blocked").each(function(){
              $(this).attr("disabled",false).removeClass("blocked");     
           });

           break;
        }
}

开始阅读结尾的'edit 2:'

我知道您的问题是关于 JSF 2.3 的,但出于好奇,我想看看在普通 JSF 中是否完全可行。好消息是,至少对于 Mojarra 2.2.8(手头没有任何其他环境)似乎可以通过覆盖 jsf.js 函数来实现。并且...如果您希望它是 'conditional',那么不是在每个 input/button/... 上,还要添加一个 passthrough 属性。

我 checked/debugged Mojarra jsf.js 文件的源代码并注意到只有在创建完整的查询字符串后才能 strip/filter 出字段,而不是 PrimeFaces 阻止的方式要添加的字段 'upfront'。可以完成此操作的函数是 getViewState 并且通过覆盖它,调用原始函数并在返回结果之前添加一些逻辑,这一切似乎都有效。缺点是它可能会过滤掉很多(见最后的评论)

要添加到代码中的 js(确保加载的是 after jsf.js)

partialSubmit.js

var orgViewState = jsf.getViewState;
jsf.getViewState = function(form) {

    var myViewState = orgViewState(form);

    var eventSource = this.ajax.request.arguments[0];
    // Read partialSubmit from the input (Mojarra puts attributes without camelcasing in the html, so pt:partialSubmit in the xhtml becomes partialsubmit in the html 
    var partialSubmit = eventSource.attributes['partialsubmit'];

    //If not on the input, check the form
    if (partialSubmit === undefined) {
        partialSubmit = form.attributes['partialsubmit'];
    } 

    if (partialSubmit != undefined && partialSubmit.value === "true") {
        var params = myViewState.split("&");
        var kvpairs = [];
        var ids = [];
        // Create list of id's based on the 'execute' list
        var execute = this.ajax.request.arguments[2].execute;
        // TODO check for other replacements (@parent, @form)?
        execute = execute.replace('@this', eventSource.id);
        execute = execute.replace('@none', "");

        var ids = execute.split(" ");
        for(j=0;j<ids.length;j++) {
            var id = ids[j];
            for (i=0;i<params.length; i++) {
                var kv = params[i].split("=");
                if (kv[0] === kv[1] || //to pass on the form id value keypair. Not sure this is needed
                    kv[0] === "javax.faces.ViewState" || // check if other 'relevant' fields need to be passed on (viewid, conversationid etc... How to detect these?
                    encodeURIComponent(id) === kv[0]) {
                    kvpairs.push("&"+params[i]);
                }
            }
        }
        return kvpairs.join("");
    } else {
        return myViewState;
    }
}

下面提供了用法示例。在此示例中,第一个和最后一个输入字段已将 pt:partialSubmt="true" 添加到输入中(添加到 ajax 标签时无法使其工作)。还有两个 ajax 启用 h:commandButtons,一个有部分提交,一个没有。使用浏览器开发者工具可以看到使用时的区别

partialSubmitDemo.xhtml

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:pt="http://xmlns.jcp.org/jsf/passthrough">

    <h:head />

    <h:body>
        <!-- adding pt:partialSubmit="true" to the form makes it work for every input/button in the form -->
        <h:form>

            <h:panelGrid columns="4" border="1" id="panel">
                <h:outputText value="label" />
                <h:outputText value="input" />
                <h:outputText value="single ajax" />
                <h:outputText value="all ajax" />

                <h:outputLabel value="inp0" />
                <h:inputText value="#{sessionScope['inp0']}" id="inp0" pt:partialsubmit="true">
                    <f:ajax render="aout0" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp0']}" id="aout0" />
                <h:outputText value="#{sessionScope['inp0']}" id="out0" />

                <h:outputLabel value="inp1" />
                <h:inputText value="#{sessionScope['inp1']}" id="inp1">
                    <f:ajax render="aout1" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp1']}" id="aout1" />
                <h:outputText value="#{sessionScope['inp1']}" id="out1" />

                <h:outputLabel value="inp2" />
                <h:inputText value="#{sessionScope['inp2']}" id="inp2">
                    <f:ajax render="aout2" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp2']}" id="aout2" />
                <h:outputText value="#{sessionScope['inp2']}" id="out2" />

                <h:outputLabel value="inp3" />
                <h:inputText value="#{sessionScope['inp3']}" id="inp3">
                    <f:ajax render="aout3" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp3']}" id="aout3" />
                <h:outputText value="#{sessionScope['inp3']}" id="out3" />

                <h:outputLabel value="inp4" />
                <h:inputText value="#{sessionScope['inp4']}" id="inp4">
                    <f:ajax render="aout4" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp4']}" id="aout4" />
                <h:outputText value="#{sessionScope['inp4']}" id="out4" />

                <h:outputLabel value="inp5" />
                <h:inputText value="#{sessionScope['inp5']}" id="inp5">
                    <f:ajax render="aout5" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp5']}" id="aout5" />
                <h:outputText value="#{sessionScope['inp5']}" id="out5" />

                <h:outputLabel value="inp6" />
                <h:inputText value="#{sessionScope['inp6']}" id="inp6">
                    <f:ajax render="aout6" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp6']}" id="aout6" />
                <h:outputText value="#{sessionScope['inp6']}" id="out6" />

                <h:outputLabel value="inp7" />
                <h:inputText value="#{sessionScope['inp7']}" id="inp7">
                    <f:ajax render="aout7" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp7']}" id="aout7" />
                <h:outputText value="#{sessionScope['inp7']}" id="out7" />

                <h:outputLabel value="inp8" />
                <h:inputText value="#{sessionScope['inp8']}" id="inp8">
                    <f:ajax render="aout8" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp8']}" id="aout8" />
                <h:outputText value="#{sessionScope['inp8']}" id="out8" />

                <h:outputLabel value="inp9" />
                <h:inputText value="#{sessionScope['inp9']}" id="inp9"
                    pt:partialsubmit="true">
                    <f:ajax render="aout9" execute="@this" />
                </h:inputText>
                <h:outputText value="#{sessionScope['inp9']}" id="aout9" />
                <h:outputText value="#{sessionScope['inp9']}" id="out9" />

            </h:panelGrid>

            <h:commandButton value="Update all ajax partial submit" pt:partialsubmit="true">
                <f:ajax render="out0 out1 out2 out3 out4 out5 out6 out7 out8 out9" execute="@this" />
            </h:commandButton>

            <h:commandButton value="Update all ajax full submit">
                <f:ajax render="out0 out1 out2 out3 out4 out5 out6 out7 out8 out9" execute="@this" />
            </h:commandButton>
            <h:commandButton value="Clear all" pt:partialsubmit="true">
                <f:setPropertyActionListener value="" target="#{sessionScope['inp0']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp1']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp2']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp3']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp4']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp5']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp6']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp7']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp8']}" />
                <f:setPropertyActionListener value="" target="#{sessionScope['inp9']}" />
                <f:ajax render="panel" execute="@this" />
            </h:commandButton>

        </h:form>

        <script src="partialSubmit.js" type="text/javascript" />

    </h:body>
</html>

您可以在 javascript 代码中看到一些评论,它需要优化,但它是一个很好的工作 start/beginning。

编辑:

  • 添加了将 pt:partialSubmit="true" 添加到 <h:form> 的选项,因此可以广泛使用它
  • 通过使用 OmniFaces <o:form includeRequestParams="true"> 调查了现有请求参数的传递,并且由于它们不在表单字段的 'viewState' 键值对中,所以它们没有被删除。

编辑 2:

伟大的 OmniFaces 项目将在即将发布的 3.0 版本中包含此功能。 A commit has been made by @BalusC that closed issue 394 由于这个问题,我在那里创建的。 5 天内 使用

<o:form> 

将默认为部分提交