如何比较两个字符串而不管它们的大小写？

Question

I have:

mytext = jQuery('#usp-title').val();

then I do

if(jQuery("#datafetch h2 a").text() == mytext) {

But one title could be:

Space Mission just as well as space mission

I cannot standardise the text format for other reasons therefore I am really looking at comparing two strings regardless of their capitalisation.

UPDATE

The thing is that I am using the input field as a search so the user could type space mission while the post title would be Space mission so the search result wouldn't be exact and i need the exact phrase instead.

Complete code:

<div id="datafetch"></div>

function fetch(){
  jQuery('#datafetch').empty();
  mytext = jQuery('#usp-title').val();
    jQuery.ajax({
        url: '<?php echo admin_url('admin-ajax.php'); ?>',
        type: 'post',
        data: { action: 'data_fetch', exactwords:  mytext },
        success: function(data) {
            jQuery('#datafetch').html( data );
        if(jQuery("#datafetch h2 a").text().toLowerCase().trim() == mytext.toLowerCase().trim()) {
            jQuery("#componi").attr("disabled", "disabled").hide();
        } else {
                jQuery("#componi").removeAttr("disabled", "disabled").show();
        }
            if(jQuery("#datafetch h2 a").text() != mytext) {
            jQuery("#fatto").hide();
            jQuery('#datafetch').empty();
        }
        }
    });

}

It's trickier actually because the search is coming from the text input, so it's about the query of the ajax i believe more than capitalisation, just a thought. The latest code above gives no results by typing:

space mission while the post title is Space mission

UPDATE 2

Post article title:

Space Mission

User searches for

space mission

Console.log(data) gives correct result

   <ul class="list-unstyled margin-top-80">
       <li>
            <h2><a target="_blank" href="example.com"">Space Mission</a></h2>
       </li>
   </ul>

Yet this doesn't happens:

jQuery('#datafetch').html( data );

if I insert the right words Space Mission does tho

Answer 1

Covert both toLowercase()

"Space Mission".toLowerCase() == "space mission".toLowerCase()

In context of your question

if(jQuery("#datafetch h2 a").text().toLowerCase() == mytext.toLowerCase()) {

Trimming in case user enters trailing or leading space, as suggested by @charlietfl

if(jQuery("#datafetch h2 a").text().trim().toLowerCase() == mytext.trim().toLowerCase()) {

Answer 2

Get the input result using jquery

var string = jQuery("#datafetch h2 a").text()

and then you can try any of the following -

Simple string comparison : converting both to same case :

string.toUpperCase() === "String".toUpperCase()

If you are fine with regex (notice the i option in regex) :

var otherString = /String/i
otherString.test(string)

There is "match" as well :

string.match(/STRING/i)

match returns null value when no match found

Answer 3

The accepted answer is correct and it does answer my original question, and that's why I accepted it. However, the issue was solved by using a setTimeout(function() as there was a little delay between the data populating the div and the check for the 2 value comparisons.

function fetch(){
        jQuery.ajax({
            url: '<?php echo admin_url('admin-ajax.php'); ?>',
            type: 'post',
            data: { action: 'data_fetch', exactwords:  jQuery('#usp-title').val() },
            success: function(data) {
                    jQuery("#datafetch").html(data);
                    setTimeout(function() {
                        var text1 = jQuery("#datafetch").find("h2").find("a").html();
                        var text1B = text1.toLowerCase();
                        var text2 = jQuery('#usp-title').val();
                        var text2B = text2.toLowerCase();
                        if(text1B == text2B) {
                            jQuery("#componi").attr("disabled", "disabled").hide();
                        } else {
                            jQuery("#componi").removeAttr("disabled", "disabled").show();
                            jQuery("#fatto").hide();
                            jQuery('#datafetch').empty();
                        }
                    }, 1000);
            }
        });
}

UPDATE

Using .promise().done() was better

function fetch(){
    var text1;
    var text1B;
    var text2;
    var text2B;
        jQuery.ajax({
            url: '<?php echo admin_url('admin-ajax.php'); ?>',
            type: 'post',
            data: { action: 'data_fetch', exactwords:  jQuery('#usp-title').val() },
            success: function(data) {
                    jQuery("#datafetch").html(data).promise().done(function(){
                        text1 = jQuery("#datafetch").find("h2").find("a").html();
                        text1B = text1.toLowerCase();
                        text2 = jQuery('#usp-title').val();
                        text2B = text2.toLowerCase();
                        if (text1B != text2B) {
                            jQuery("#componi").removeAttr("disabled", "disabled").show();
                            jQuery("#fatto").hide();
                            jQuery('#datafetch').empty();
                        } else if (text1B == text2B) {
                            jQuery("#componi").attr("disabled", "disabled").hide();
                        }
                    });
            }
        });
}

UPDATE TWO

This is what I finally used

function fetch(){
  jQuery.ajax({
    url: '<?php echo admin_url('admin-ajax.php'); ?>',
    type: 'post',
    data: { action: 'data_fetch', exactwords:  jQuery('#usp-title').val() },
    success: function(data) {
      var text2;
      var text2B;
      text2 = jQuery('#usp-title').val();
      text2B = text2.toLowerCase();
      jQuery("#datafetch").html(data).promise().done(function(){
        jQuery("#datafetch ul li h2 a").each(function() {
          var $this = jQuery(this);
          if ($this.text().toLowerCase() !== text2B) {
            $this.parent().parent().hide();
          } else if (text1B == text2B) {
            jQuery("#componi").attr("disabled", "disabled").hide();
          }
        });
      });
    }
  });
}

Answer 4

You can do like this

"Space Mission".replace(/\s+/g, "").toLowerCase() == "space    mission".replace(/\s+/g, "").toLowerCase()

The left hand side will be equal to spacemission same as the expression on the right sade

It will first remove any white space even in between words & will convert to lower case. Removing white space is necessary because space mission is not same as space mission

Answer 5

You will require to convert both strings to lowercase or uppercase and then do the comparison.

    var mytext = jQuery('#usp-title').val();
    if(jQuery("#datafetch h2 a").text().toLowerCase() == mytext.toLowerCase()) 
    {

    }

Answer 6

将两个字符串都转换为大写或小写