javascript - 我如何根据 URL 中的参数填充我的搜索字段

Question

我正在开发一个 asp.net web 应用程序，我有以下代码来构建搜索字段部分，它根据用户的输入构建 URL 参数:-

<script type="text/javascript">

$(document).ready(function(){

    $('#button').click(function(e) {  
        var count=1;
        var s="";

        var inputvalue = $("#journal").val();
        var inputvalue2 = $("#keywords").val();
        var inputvalue3 = $("#datepub").val();
        var inputvalue4 = $("#title").val();
        var inputvalue5 = $("#localcurrency").val();
        var inputvalue6 = $("#locations").val();
        var inputvalue7 = $("#dropdown1").val();
        var inputvalue8 = $("#dropdown2").val();

        if(inputvalue!=null && inputvalue!="")
        {
        s = s+ "FilterField"+count+"=Journal&FilterValue"+count+"="+inputvalue+"&";
        count++;
        }
        if(inputvalue2!=null && inputvalue2!="")
        {
        s = s+ "FilterField"+count+"=KeyWords&FilterValue"+count+"="+inputvalue2+"&";
        count++;
        }
        if(inputvalue3!=null && inputvalue3!="")
        {
        s = s+ "FilterField"+count+"=datepub&FilterValue"+count+"="+inputvalue3+"&";
        count++;
        }
        if(inputvalue4!=null && inputvalue4!="")
        {
        s = s+ "FilterField"+count+"=Title&FilterValue"+count+"="+inputvalue4+"&";
        count++;
        }
        if(inputvalue5!=null && inputvalue5!="")
        {
        s = s+ "FilterField"+count+"=localcurrency&FilterValue"+count+"="+inputvalue5+"&";
        count++;
        }
        if(inputvalue6!=null && inputvalue6!="")
        {
        s = s+ "FilterField"+count+"=locations&FilterValue"+count+"="+inputvalue6+"&";
        count++;
        }
        if(inputvalue7!=null && inputvalue7!="")
        {
        s = s+ "FilterField"+count+"=dropdown1&FilterValue"+count+"="+inputvalue7+"&";
        count++;
        }
        if(inputvalue8!=null && inputvalue8!="")
        {
        s = s+ "FilterField"+count+"=dropdown2&FilterValue"+count+"="+inputvalue8+"&";
        count++;
        }
        window.location.replace("/teamsites/Bib%20Test/Forms/search.aspx?"+s);

    });
});
</script> 

       Journal <input type="text" id="journal"> 
       keywords <input type="text" id="keywords"> 




<select id="datepub">
<option value=""></option>
  <option value="1950">1950</option>
  <option value="2010">2010</option>
  <option value="2017">2017</option>
  <option value="audi">Audi</option>
</select>

title
<select id="title">
<option value=""></option>
  <option value="TestDoc">test doc</option>
  <option value="t">t</option>

</select>

localcurrency
<select id="localcurrency">
<option value=""></option>
  <option value="USD">USD</option>

</select>

locations
<select id="locations">
<option value=""></option>
  <option value="US">US</option>
  <option value="UK">UK</option>

</select>

dropdown1
<select id="dropdown1">
<option value=""></option>
  <option value="a">a</option>
  <option value="b">b</option>

</select>

dropdown2
<select id="dropdown2">
<option value=""></option>
  <option value="aa">aa</option>
  <option value="bb">bb</option>
  <option value="cc">cc</option>
  <option value="dd">dd</option>
</select>
       <button type="button" id="button">search</button>

当用户点击搜索按钮时，用户将被重定向到 /teamsites/Bib%20Test/Forms/search.aspx 页面，其中包含 url 中的过滤器参数，这将根据传递的参数显示相关记录。

现在过滤工作正常..但我面临的问题是，在我将用户重定向到此页面 /teamsites/Bib%20Test/Forms/search.aspx 后，过滤字段值(如本地货币、地点、标题等。)将被清除。那么我可以使用 JavaScript 为文件管理器字段分配其原始值吗？我的意思是我可以从 URL 中提取字段的值并将其分配给它们吗？所以在用户被重定向到 /teamsites/Bib%20Test/Forms/search.aspx 之后，他们仍然可以看到用他们输入的过滤值填充的过滤字段？

Answer 1

您可以通过执行以下操作来完成此操作:

• 解析当前页面的查询字符串，分离出其查询参数
• 处理这些以匹配过滤器字段名称及其值
• 使用$('#' + fieldName).val(value)设置页面中的字段值

下面，作为演示，我将硬编码查询字符串 '?FilterField0=locations&FilterValue0=US&FilterField1=dropdown1&FilterValue1=b' 传递到 populateSearchFields() 函数中.在实践中，您将使用此处的三个函数，不加修改，但不是硬编码值，而是传入 window.location.search。

// input: '?a=b&b=c&e=f'
// output: { a: 'b', b: 'c', e: 'f' }
function buildParameterMap(queryString) {
  // ignore the ? at the beginning and split the query string into 
  // pieces separated by &
  var pairs = queryString.replace(/^\?/, '').split('&');
  var map = {};

  pairs.forEach(function(pair) {
    // further split each piece to the left and right of the =
    // ignore pairs that are empty strings
    if (pair) {
      var sides = pair.split('=');
      map[sides[0]] = decodeURIComponent(sides[1]);
    }
  });

  return map;
}

// input: { FilterField0: 'Name', FilterValue0: 'Fred',
//          FilterField1: 'age', FilterValue1: '30' }
// output: { name: 'Fred', age: '30' }
function buildFilterFieldMap(parameterMap) {
  var maxFieldCount = 15;

  var map = {};

  for (var i = 0; i < maxFieldCount; i += 1) {
    var filterFieldName = parameterMap['FilterField' + i];
    if (filterFieldName) {
      map[filterFieldName.toLowerCase()] = parameterMap['FilterValue' + i];
    }
  }

  return map;
}

function populateSearchFields(queryString) {
  // build a map from URL query string parameter -> value
  var parameterMap = buildParameterMap(queryString);

  // build a map from search field name -> value
  var filterFieldMap = buildFilterFieldMap(parameterMap);

  Object.keys(filterFieldMap).forEach(function(field) {
    $('#' + field).val(filterFieldMap[field]);
  });
}

populateSearchFields('?FilterField0=locations&FilterValue0=US&FilterField1=dropdown1&FilterValue1=b');

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
Journal <input type="text" id="journal"> keywords <input type="text" id="keywords">


<select id="datepub">
    <option value=""></option>
      <option value="1950">1950</option>
      <option value="2010">2010</option>
      <option value="2017">2017</option>
      <option value="audi">Audi</option>
    </select> title
<select id="title">
    <option value=""></option>
      <option value="TestDoc">test doc</option>
      <option value="t">t</option>
    
    </select> localcurrency
<select id="localcurrency">
    <option value=""></option>
      <option value="USD">USD</option>
    
    </select> locations
<select id="locations">
    <option value=""></option>
      <option value="US">US</option>
      <option value="UK">UK</option>
    
    </select> dropdown1
<select id="dropdown1">
    <option value=""></option>
      <option value="a">a</option>
      <option value="b">b</option>
    
    </select> dropdown2
<select id="dropdown2">
    <option value=""></option>
      <option value="aa">aa</option>
      <option value="bb">bb</option>
      <option value="cc">cc</option>
      <option value="dd">dd</option>
    </select>
<button type="button" id="button">search</button>