将javascript创建的动态文本字段绑定到bean

本文介绍了将javascript创建的动态文本字段绑定到bean的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下代码，这创建了我在textField内部输入的文本字段的数量.

i have the following code, this creates the number of textfields that i enter inside the textField.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Dashboard | BlueWhale Admin</title>
    <link rel="stylesheet" type="text/css" href="../css/reset.css" media="screen" />
    <link rel="stylesheet" type="text/css" href="../css/text.css" media="screen" />
    <link rel="stylesheet" type="text/css" href="../css/grid.css" media="screen" />
    <link rel="stylesheet" type="text/css" href="../css/layout.css" media="screen" />
    <link rel="stylesheet" type="text/css" href="../css/nav.css" media="screen" />

<script type="text/javascript">
//<![CDATA[
            function BuildFormFields($amount)
            {
                var
                    $container = document.getElementById('FormFields'),
                    $item, $field, $i;

                $container.innerHTML = '';
                for ($i = 0; $i < $amount; $i++) {
                    $item = document.createElement('div');
                    $item.style.margin = '3px';

                    $field = document.createElement('span');
                    $field.innerHTML = '<hr>'+'News '+ ($i+1) +             "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
                    $field.style.marginRight = '10px';
                    $item.appendChild($field);

                    $field = document.createElement('input');
                    $field.name = 'Design[' + $i + ']';
                    $field.id = 'Design[' + $i + ']';
                    $field.type = 'text';
                    $field.className = 'error';
                    $field.style.width = '500px';
                    $item.appendChild($field);


                    $container.appendChild($item);
                }
            }

        function saveNews()
        {
            var value=document.getElementById("noOfNews").value;

            if(value==="")
            {
               alert("Please Enter Some Data");
            }
            else
            {
                var $no = parseInt(value),$i;
                for($i=0;$i < $no; $i++ )
                {
                    var value1=document.getElementById( 'Design[' + $i + ']' ).value;


                    if(value1==="")
                    {
                    alert("Please enter Data");
                    break;
                    }
                }
                if($no===$i)
                {
                    alert("Data Saved !!!");
                }
        }
    }
        //]]>
        </script>
        </head>
<body>
Number Of News Item To be Displayed <input id="noOfNews" type="text" onkeyup="BuildFormFields(parseInt(this.value, 10));" />

            <div id="FormFields" style="margin: 20px 0px;"></div>
<button class="btn btn-blue" onclick="saveNews()">Save</button>
</body>
</html>

我正在使用jsf 2.0，并且想要将输入的数据保存到数据库中，任何想法我该如何实现.

I am using jsf 2.0 and want to save the entered data into the database, any ideas how can i achieve this.

谢谢，Abhinay

Thanks,Abhinay

推荐答案

与使用Javascript相比，使用后备bean可以更好地解决这一问题.使用ajax，您不需要刷新任何页面.与此类似:

You can better approach this with a backing bean than using Javascript. Using ajax you wouldn't need any page refreshes. Something along the lines of this:

HTML

<h:form>
    <p>
        <h:inputText value="#{bean.noOfFields}" />
        <h:commandButton value="Create fields">
            <f:ajax execute="@form" render="@form" />
        </h:commandButton>
    </p>

    <hr />

    <p>
        <c:forEach items=#{bean.values} varStatus="counter">
            Field no. #{counter.index} <h:inputText value="#{bean.values[counter.index}" /><br />
        </c:forEach>

        <h:commandButton action="#{bean.submit}" value="Save" />
    </p>
</h:form>

Bean.java

@ManagedBean
@ViewScoped
public class Bean {
    private String noOfFields = 1;
    private String[] values = new String[1];

    public void submit() {
        // save values in database
    }

    public String getNoOfFields() {
        return noOfFields;
    }

    public void setNoOfFields(String noOfFields) {
        try {
            values = new String[Integer.valueOf(noOfFields)];
            this.noOfFields = noOfFields;
        catch(NumberFormatException ex) {
            values = new String[1];
            noOfFields = "1";
        }
    }

    public String[] getValues() {
        return values;
    }
}

注意

如果要坚持键入事件，也可以轻松地将其绑定到<h:inputText value="#{bean.noOfFields}" />.尽管我建议不要这样做，因为每次击键都会调用另一个ajax调用.

In case you want to stick to a keyup event, you can easily bind this to <h:inputText value="#{bean.noOfFields}" /> too. Though I'd recommend not doing this, since every keystroke will invoke another ajax call.

这篇关于将javascript创建的动态文本字段绑定到bean的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！