如何使用 JavaScript 在輸入字段中輸入值？

Question

我正在嘗試使用 javascript 在輸入搜索字段中添加一些文本

我試過下面的代碼：

document.getElementsByClassName('contacts_modal_search_field')[0].innerHTML = \"test\

和許多其他人，但沒有成功。

這是代碼：

<div class="contacts_modal_search">
  <input class="form-control contacts_modal_search_field no_outline ng-pristine ng-valid ng-empty ng-touched" my-focused="" type="search" placeholder="Search" ng-model="search.query" autocomplete="off" style="">
  <a class="im_dialogs_search_clear tg_search_clear ng-hide" ng-click="search.query = ''" ng-show="search.query.length" style="">
    <i class="icon icon-search-clear"></i>
  </a>
</div>

Answer 1

使用document.getElementById("id").value = "yourvalue"或document.getElementsByClassName("yourclass")[index].value = "yourvalue" 。

使用id ：

 Enter text to be the value of the second input field:<br/> <input type="text" id="text"/> <br/> <input type="button" onClick="changeValue()" value="Change Value"/> <p/> <input type="text" id="result"/> <script> function changeValue(){ document.getElementById("result").value = document.getElementById("text").value; } </script>

使用class ：

 Enter text to be the value of the second input field:<br/> <input type="text" class="text"/> <br/> <input type="button" onClick="changeValue()" value="Change Value"/> <p/> <input type="text" class="result"/> <script> function changeValue(){ document.getElementsByClassName("result")[0].value = document.getElementsByClassName("text")[0].value; } </script>

對於您的代碼：

 Enter text to be the value of the search input field:<br/> <input type="text" class="text"/> <br/> <input type="button" onClick="changeValue()" value="Change Value"/> <p/> <script> function changeValue(){ document.getElementsByClassName("form-control")[0].value = document.getElementsByClassName("text")[0].value; } </script> <hr> <div class="contacts_modal_search"> <input class="form-control contacts_modal_search_field no_outline ng-pristine ng-valid ng-empty ng-touched" my-focused="" type="search" placeholder="Search" ng-model="search.query" autocomplete="off" style=""> <a class="im_dialogs_search_clear tg_search_clear ng-hide" ng-click="search.query = ''" ng-show="search.query.length" style=""> <i class="icon icon-search-clear"></i> </a> </div>

在窗口加載時更改輸入框的值（使用window.onload ）：

 <script> window.onload = function(){ document.getElementsByClassName("form-control")[0].value = "your value"; } </script> <div class="contacts_modal_search"> <input class="form-control contacts_modal_search_field no_outline ng-pristine ng-valid ng-empty ng-touched" my-focused="" type="search" placeholder="" ng-model="search.query" autocomplete="off" style=""> <a class="im_dialogs_search_clear tg_search_clear ng-hide" ng-click="search.query = ''" ng-show="search.query.length" style=""> <i class="icon icon-search-clear"></i> </a> </div>

Answer 2

也許是這樣的：

 document.getElementsByClassName('contacts_modal_search_field')[0].value = "test";

 <div class="contacts_modal_search"> <input class="form-control contacts_modal_search_field no_outline ng-pristine ng-valid ng-empty ng-touched" my-focused="" type="search" placeholder="Search" ng-model="search.query" autocomplete="off" style=""> <a class="im_dialogs_search_clear tg_search_clear ng-hide" ng-click="search.query = ''" ng-show="search.query.length" style=""> <i class="icon icon-search-clear"></i> </a> </div>

Answer 3

您可以使用java腳本在文本框中輸入。

  <div class="contacts_modal_search">
   <input class="form-control contacts_modal_search_field no_outline ng-pristine ng-valid ng-empty ng-touched" my-focused="" type="search" placeholder="Search" ng-model="search.query" autocomplete="off" style="" id='contacts_modal_search_field'>
  <a class="im_dialogs_search_clear tg_search_clear ng-hide" ng-click="search.query = ''" ng-show="search.query.length" style="">
    <i class="icon icon-search-clear"></i>
  </a>
</div>
<script>
window.onload=function(){
//by Class name
document.getElementsByClassName('contacts_modal_search_field')[0].value='Something'

//by Id 
document.getElementById('contacts_modal_search_field')[0].value='Something' //if 'contacts_modal_search_field' is your input box ID

//By Tag name
document.getElementsByTagName('input')[0].value='Something'
}
</script>