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[英]How to validate two check boxes and make sure that at least one is checked?
[英]How to validate multiple text boxes to make sure they have letters only?
我需要使用javascript验证许多不同的文本框,并且我不想为每个文本框都使用getElementById。 在提交按钮之前,您将如何验证以确保每个文本框都包含一个单词?
<table id="inputTable">
<tr>
<td>
<P>Verb: <input type="text" required id="varA"></p>
<P>Adjective: <input type="text" required id="varB"></p>
<P>Noun (plural): <input type="text" required id="varC"></p>
<P>Adjective: <input type="text" required id="varD"></p>
<P>Verb enging in "ing": <input type="text" required id="varE"></p>
<P>Verb: <input type="text" required id="varF"></p>
<P>Number: <input type="text" required id="varG"></p>
<P>Adjective: <input type="text" required id="varH"></p>
</td>
<td>
<P>Noun (plural): <input type="text" required id="varI"></p>
<P>Noun (plural): <input type="text" required id="varJ"></p>
<P>Noun (plural): <input type="text" required id="varK"></p>
<P>Relative (plural): <input type="text" required id="varL"></p>
<P>Adjective: <input type="text" required id="varM"></p>
<P>Adjective: <input type="text" required id="varN"></p>
<P>Noun (plural): <input type="text" required id="varO"></p>
<P>Verb: <input type="text" required id="varP"></p>
</td>
</tr>
function submit_form() { all_input = document.querySelectorAll('input[type="text"]'); console.log(all_input); for (var i = 0; i < all_input.length; ++i) { if (all_input[i].value.trim().match(/\\w/) == null) { alert("You need to enter a word in each text box"); return } } } document.getElementById('fm').addEventListener('click',submit_form)
<form > <table id="inputTable"> <tr> <td> <P>Verb: <input type="text" required id="varA"> </p> <P>Adjective: <input type="text" required id="varB"> </p> <P>Noun (plural): <input type="text" required id="varC"> </p> <P>Adjective: <input type="text" required id="varD"> </p> <P>Verb enging in "ing": <input type="text" required id="varE"> </p> <P>Verb: <input type="text" required id="varF"> </p> <P>Number: <input type="text" required id="varG"> </p> <P>Adjective: <input type="text" required id="varH"> </p> </td> <td> <P>Noun (plural): <input type="text" required id="varI"> </p> <P>Noun (plural): <input type="text" required id="varJ"> </p> <P>Noun (plural): <input type="text" required id="varK"> </p> <P>Relative (plural): <input type="text" required id="varL"> </p> <P>Adjective: <input type="text" required id="varM"> </p> <P>Adjective: <input type="text" required id="varN"> </p> <P>Noun (plural): <input type="text" required id="varO"> </p> <P>Verb: <input type="text" required id="varP"> </p> </td> </tr> <button type='submit' id="fm">SUbmit</button> </form>
您可以为每个文本框使用$('input[type=text]')
而不是getElementById。
将此属性添加到每个输入中: pattern="^[a-zA-Z]+$"
-如果字段中不包含字母字符,它将阻止提交表单-假定它是html form
。
HTML5表单验证允许在pattern
属性中使用正则表达式。 请参见MDN的数据表单验证]( https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Forms/Data_form_validation )
您可以使用document.querySelectorAll
返回document.querySelectorAll
中元素的列表。
使用现有代码尝试以下脚本:
var txtbox = document.querySelectorAll("input[type=text]");
for(var i = 0;i<txtbox.length;i++)
{
alert("Enter Text");
}
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