有没有办法从 javascript 函数调用控制器操作

Is there a way to call a controller action from a javascript function?

本文关键字：函数调用 控制器 操作 javascript 有没有      更新时间：2023-09-26

我有一个圣杯项目，我需要选择要删除的字段，当我单击删除时，我需要一个函数来删除所有选定的项目：

网页代码： 

<form name="bookForm" action="list" method="post">
    ....
    <a onclick="deleteBooks();">Delete</a>
    ....
    ....
    <g:checkBox id="select_all" name="select_all" value="" onclick="selectAll();" />
    ....
    <g:each in="${bookList}" status="i" var="bookInstance">
        <tr class="${(i % 2) == 0 ? 'odd' : 'even'}">
            <td><g:checkBox id="${bookInstance.id}" name="delete_checkbox" value="" /></td>
        </tr>
    </g:each>
    ....
</form>

JavaScript代码：

<script type="text/javascript">
    function selectAll(){
        var select = document.getElementById("select_all");
        var checkboxes = document.forms['bookForm'].elements['delete_checkbox'];
        if (select.checked){
            for (i = 0; i < checkboxes.length; i++) checkboxes[i].checked = true;
        }else{
            for (i = 0; i < checkboxes.length; i++) checkboxes[i].checked = false;
        }
    }
    function deleteBooks(){
        var checkboxes = document.forms['bookForm'].elements['delete_checkbox'];
        var counter = 0;
            for (i = 0; i < checkboxes.length; i++){
                if(checkboxes[i].checked){
                    counter ++;
                    ${g.remoteFunction(action:'delete', controller:'book', id:checkboxes[i].id) }
                }
            }
            if (counter == 0) alert("select books to delete");
        }
    </script>

selectAll 函数工作正常，但删除书籍函数在添加时会导致此错误 ${g.remoteFunction(action:'delete', controller:'book', id:checkboxes[i].id) }

例外：

Error 500: Error evaluating expression [g.remoteFunction(action:&#39;delete&#39;, controller:&#39;book&#39;, id: checkboxes[i].id)] on line [26]: Cannot get property &#39;null&#39; on null object
Servlet: grails
URI: /myProject/grails/book/list.dispatch
Exception Message: Cannot get property &#39;null&#39; on null object 
Caused by: Error evaluating expression [g.remoteFunction(action:&#39;delete&#39;, controller:&#39;book&#39;, id: checkboxes[i].id)] on line [26]: Cannot get property &#39;null&#39; on null object 
Class: list.gsp 
At Line: [26] 
Code Snippet:

如果我用${g.remoteFunction(action:'delete', controller:'book') }代替它

例外：

Error 500: Error evaluating expression [g.remoteFunction(action:&#39;delete&#39;, controller:&#39;book&#39;)] on line [27]: No javascript provider is configured
Servlet: grails
URI: /myProject/grails/book/list.dispatch
Exception Message: No javascript provider is configured 
Caused by: Error evaluating expression [g.remoteFunction(action:&#39;delete&#39;, controller:&#39;book&#39;)] on line [27]: No javascript provider is configured 
Class: list.gsp 
At Line: [27] 
Code Snippet:

如何从 javascript 函数或 jquery 调用控制器操作？

function deleteBooks(){
    var checkboxes = document.forms['bookForm'].elements['delete_checkbox'];
    var counter = 0;
    for (i = 0; i < checkboxes.length; i++){
        if(checkboxes[i].checked){
              counter ++;
              var bookId = checkboxes[i].id;
              <g:remoteFunction controller="book" action="delete" id="${bookId}" /> 
        }
    }
    if (counter == 0) alert("select books to delete");
}

如果有任何错误，请通知我

GSP 在服务器端工作，JavaScript 在客户端工作。你不能混合它，使用ajax：

$.ajax({
   type: 'POST',
   url: "${createLink(action:'delete', controller:'book')}/" + checkboxes[i].id
});

remoteFunction很好，但是你需要有一个JavaScript库。查看 http://grails.org/plugin/jquery 以及如何安装它。

如果你内联编写javascript，你可以这样做。但是，如果javascript位于您要包含的文件中 - 它将不起作用。此外，您不需要远程函数中的"g."。

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