我想从文本框中捕获事件数据，但是对于输入的文本，它返回空。你能告诉我这里我做错了什么吗？输入的第一个字符不会提醒姓名。请帮忙。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script>
$(function() {
$("#name").keydown(function(event){
var name = $("#name").val();
alert("name" + name);
});
});
</script>
</head>
<body>
<input id="name">
</body>
</html>
答案 0 :(得分：1)
|Starting dbm-update for database root @ jdbc:mysql://localhost/test?useUnicode=yes&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
Error |
2015-07-18 12:41:10,184 [main] ERROR liquibase - Change Set Update4.groovy::1437215773652-1::mg (generated) failed. Error: Error executing SQL CREATE TABLE `city` (`id` VARCHAR(16) NOT NULL, `version` BIGINT NOT NULL, `date_created` DATETIME NOT NULL, `last_updated` DATETIME NOT NULL, `name` VARCHAR(255) NOT NULL, CONSTRAINT `cityPK` PRIMARY KEY (`id`)) type=InnoDB: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1
Message: Error executing SQL CREATE TABLE `city` (`id` VARCHAR(16) NOT NULL, `version` BIGINT NOT NULL, `date_created` DATETIME NOT NULL, `last_updated` DATETIME NOT NULL, `name` VARCHAR(255) NOT NULL, CONSTRAINT `cityPK` PRIMARY KEY (`id`)) type=InnoDB: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1
Line | Method
->> 62 | execute in liquibase.executor.jvm.JdbcExecutor
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 104 | execute in ''
| 1091 | execute . . . . . in liquibase.database.AbstractDatabase
| 1075 | executeStatements in ''
| 317 | execute . . . . . in liquibase.changelog.ChangeSet
| 27 | visit in liquibase.changelog.visitor.UpdateVisitor
| 58 | run . . . . . . . in liquibase.changelog.ChangeLogIterator
| 114 | update in liquibase.Liquibase
| 26 | doCall . . . . . in DbmUpdate$_run_closure1_closure2
| 59 | doCall in _DatabaseMigrationCommon_groovy$_run_closure2_closure11
| 133 | executeInSession in grails.plugin.databasemigration.MigrationUtils
| 51 | doCall in _DatabaseMigrationCommon_groovy$_run_closure2
^ 25 | doCall . . . . . in DbmUpdate$_run_closure1
Caused by MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1
->> 400 | handleNewInstance in com.mysql.jdbc.Util
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 383 | getInstance in ''
| 980 | createSQLException in com.mysql.jdbc.SQLError
| 3847 | checkErrorPacket in com.mysql.jdbc.MysqlIO
| 3783 | checkErrorPacket in ''
| 2447 | sendCommand in ''
| 2594 | sqlQueryDirect . in ''
| 2541 | execSQL in com.mysql.jdbc.ConnectionImpl
| 2499 | execSQL . . . . . in ''
| 844 | execute in com.mysql.jdbc.StatementImpl
| 748 | execute . . . . . in ''
| 92 | doInStatement in liquibase.executor.jvm.JdbcExecutor$1ExecuteStatementCallback
| 55 | execute . . . . . in liquibase.executor.jvm.JdbcExecutor
| 104 | execute in ''
| 1091 | execute . . . . . in liquibase.database.AbstractDatabase
| 1075 | executeStatements in ''
| 317 | execute . . . . . in liquibase.changelog.ChangeSet
| 27 | visit in liquibase.changelog.visitor.UpdateVisitor
| 58 | run . . . . . . . in liquibase.changelog.ChangeLogIterator
| 114 | update in liquibase.Liquibase
| 26 | doCall . . . . . in DbmUpdate$_run_closure1_closure2
| 59 | doCall in _DatabaseMigrationCommon_groovy$_run_closure2_closure11
| 133 | executeInSession in grails.plugin.databasemigration.MigrationUtils
| 51 | doCall in _DatabaseMigrationCommon_groovy$_run_closure2
^ 25 | doCall . . . . . in DbmUpdate$_run_closure1
liquibase.exception.MigrationFailedException: Migration failed for change set Update4.groovy::1437215773652-1::mg (generated):
Reason: liquibase.exception.DatabaseException: Error executing SQL CREATE TABLE `city` (`id` VARCHAR(16) NOT NULL, `version` BIGINT NOT NULL, `date_created` DATETIME NOT NULL, `last_updated` DATETIME NOT NULL, `name` VARCHAR(255) NOT NULL, CONSTRAINT `cityPK` PRIMARY KEY (`id`)) type=InnoDB: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1:
Caused By: Error executing SQL CREATE TABLE `city` (`id` VARCHAR(16) NOT NULL, `version` BIGINT NOT NULL, `date_created` DATETIME NOT NULL, `last_updated` DATETIME NOT NULL, `name` VARCHAR(255) NOT NULL, CONSTRAINT `cityPK` PRIMARY KEY (`id`)) type=InnoDB: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1:
Caused By: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1
at liquibase.changelog.ChangeSet.execute(ChangeSet.java:347)
at liquibase.changelog.visitor.UpdateVisitor.visit(UpdateVisitor.java:27)
at liquibase.changelog.ChangeLogIterator.run(ChangeLogIterator.java:58)
at liquibase.Liquibase.update(Liquibase.java:114)
at DbmUpdate$_run_closure1_closure2.doCall(DbmUpdate:26)
at _DatabaseMigrationCommon_groovy$_run_closure2_closure11.doCall(_DatabaseMigrationCommon_groovy:59)
at grails.plugin.databasemigration.MigrationUtils.executeInSession(MigrationUtils.groovy:133)
at _DatabaseMigrationCommon_groovy$_run_closure2.doCall(_DatabaseMigrationCommon_groovy:51)
at DbmUpdate$_run_closure1.doCall(DbmUpdate:25)
Caused by: liquibase.exception.DatabaseException: Error executing SQL CREATE TABLE `city` (`id` VARCHAR(16) NOT NULL, `version` BIGINT NOT NULL, `date_created` DATETIME NOT NULL, `last_updated` DATETIME NOT NULL, `name` VARCHAR(255) NOT NULL, CONSTRAINT `cityPK` PRIMARY KEY (`id`)) type=InnoDB: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1
at liquibase.executor.jvm.JdbcExecutor.execute(JdbcExecutor.java:62)
at liquibase.executor.jvm.JdbcExecutor.execute(JdbcExecutor.java:104)
at liquibase.database.AbstractDatabase.execute(AbstractDatabase.java:1091)
at liquibase.database.AbstractDatabase.executeStatements(AbstractDatabase.java:1075)
at liquibase.changelog.ChangeSet.execute(ChangeSet.java:317)
... 8 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1
at com.mysql.jdbc.Util.handleNewInstance(Util.java:400)
at com.mysql.jdbc.Util.getInstance(Util.java:383)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:980)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3847)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3783)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2447)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2594)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2541)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2499)
at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:844)
at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:748)
at liquibase.executor.jvm.JdbcExecutor$1ExecuteStatementCallback.doInStatement(JdbcExecutor.java:92)
at liquibase.executor.jvm.JdbcExecutor.execute(JdbcExecutor.java:55)
... 12 more
尝试上述代码。或参见演示：Demo
答案 1 :(得分：0)
即使在文本框设置之前，您也可以获得文本框的价值。您应该尝试从事件参数中获取值。您可以使用event.keycode获取按键，如下所示
$(function() {
$("#name").keydown(function(event){
// Just to make sure it works in all browsers
var keycode = (event.keyCode ? event.keyCode : event.which);
var userInput = String.fromCharCode(keycode);
alert("name"+userInput );
});
});